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-rw-r--r--drivers/char/Makefile1
-rw-r--r--drivers/char/amiserial.c25
-rw-r--r--drivers/char/briq_panel.c6
-rw-r--r--drivers/char/cyclades.c22
-rw-r--r--drivers/char/epca.c4
-rw-r--r--drivers/char/ip2/ip2main.c4
-rw-r--r--drivers/char/isicom.c13
-rw-r--r--drivers/char/istallion.c68
-rw-r--r--drivers/char/keyboard.c10
-rw-r--r--drivers/char/mxser.c2
-rw-r--r--drivers/char/n_gsm.c1
-rw-r--r--drivers/char/n_hdlc.c16
-rw-r--r--drivers/char/n_r3964.c10
-rw-r--r--drivers/char/n_tty.c17
-rw-r--r--drivers/char/nozomi.c4
-rw-r--r--drivers/char/pty.c47
-rw-r--r--drivers/char/riscom8.c14
-rw-r--r--drivers/char/rocket.c28
-rw-r--r--drivers/char/selection.c13
-rw-r--r--drivers/char/serial167.c8
-rw-r--r--drivers/char/specialix.c13
-rw-r--r--drivers/char/stallion.c20
-rw-r--r--drivers/char/sx.c12
-rw-r--r--drivers/char/synclink.c21
-rw-r--r--drivers/char/synclink_gt.c92
-rw-r--r--drivers/char/synclinkmp.c43
-rw-r--r--drivers/char/tty_io.c150
-rw-r--r--drivers/char/tty_ioctl.c18
-rw-r--r--drivers/char/tty_ldisc.c43
-rw-r--r--drivers/char/tty_mutex.c47
-rw-r--r--drivers/char/tty_port.c4
-rw-r--r--drivers/char/vc_screen.c4
-rw-r--r--drivers/char/vt.c37
-rw-r--r--drivers/char/vt_ioctl.c17
34 files changed, 506 insertions, 328 deletions
diff --git a/drivers/char/Makefile b/drivers/char/Makefile
index 273cee1cc77b..dc9641660605 100644
--- a/drivers/char/Makefile
+++ b/drivers/char/Makefile
@@ -9,6 +9,7 @@ FONTMAPFILE = cp437.uni
obj-y += mem.o random.o tty_io.o n_tty.o tty_ioctl.o tty_ldisc.o tty_buffer.o tty_port.o
+obj-y += tty_mutex.o
obj-$(CONFIG_LEGACY_PTYS) += pty.o
obj-$(CONFIG_UNIX98_PTYS) += pty.o
obj-y += misc.o
diff --git a/drivers/char/amiserial.c b/drivers/char/amiserial.c
index 4f8d60c25a98..a11c8c9ca3d4 100644
--- a/drivers/char/amiserial.c
+++ b/drivers/char/amiserial.c
@@ -1072,7 +1072,7 @@ static int get_serial_info(struct async_struct * info,
if (!retinfo)
return -EFAULT;
memset(&tmp, 0, sizeof(tmp));
- lock_kernel();
+ tty_lock();
tmp.type = state->type;
tmp.line = state->line;
tmp.port = state->port;
@@ -1083,7 +1083,7 @@ static int get_serial_info(struct async_struct * info,
tmp.close_delay = state->close_delay;
tmp.closing_wait = state->closing_wait;
tmp.custom_divisor = state->custom_divisor;
- unlock_kernel();
+ tty_unlock();
if (copy_to_user(retinfo,&tmp,sizeof(*retinfo)))
return -EFAULT;
return 0;
@@ -1100,14 +1100,14 @@ static int set_serial_info(struct async_struct * info,
if (copy_from_user(&new_serial,new_info,sizeof(new_serial)))
return -EFAULT;
- lock_kernel();
+ tty_lock();
state = info->state;
old_state = *state;
change_irq = new_serial.irq != state->irq;
change_port = (new_serial.port != state->port);
if(change_irq || change_port || (new_serial.xmit_fifo_size != state->xmit_fifo_size)) {
- unlock_kernel();
+ tty_unlock();
return -EINVAL;
}
@@ -1127,7 +1127,7 @@ static int set_serial_info(struct async_struct * info,
}
if (new_serial.baud_base < 9600) {
- unlock_kernel();
+ tty_unlock();
return -EINVAL;
}
@@ -1163,7 +1163,7 @@ check_and_exit:
}
} else
retval = startup(info);
- unlock_kernel();
+ tty_unlock();
return retval;
}
@@ -1528,6 +1528,7 @@ static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
{
struct async_struct * info = tty->driver_data;
unsigned long orig_jiffies, char_time;
+ int tty_was_locked = tty_locked();
int lsr;
if (serial_paranoia_check(info, tty->name, "rs_wait_until_sent"))
@@ -1538,7 +1539,12 @@ static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
orig_jiffies = jiffies;
- lock_kernel();
+ /*
+ * tty_wait_until_sent is called from lots of places,
+ * with or without the BTM.
+ */
+ if (!tty_was_locked)
+ tty_lock();
/*
* Set the check interval to be 1/5 of the estimated time to
* send a single character, and make it at least 1. The check
@@ -1579,7 +1585,8 @@ static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
break;
}
__set_current_state(TASK_RUNNING);
- unlock_kernel();
+ if (!tty_was_locked)
+ tty_unlock();
#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies);
#endif
@@ -1703,7 +1710,9 @@ static int block_til_ready(struct tty_struct *tty, struct file * filp,
printk("block_til_ready blocking: ttys%d, count = %d\n",
info->line, state->count);
#endif
+ tty_unlock();
schedule();
+ tty_lock();
}
__set_current_state(TASK_RUNNING);
remove_wait_queue(&info->open_wait, &wait);
diff --git a/drivers/char/briq_panel.c b/drivers/char/briq_panel.c
index 555cd93c2ee5..d5fa113afe37 100644
--- a/drivers/char/briq_panel.c
+++ b/drivers/char/briq_panel.c
@@ -67,15 +67,15 @@ static void set_led(char state)
static int briq_panel_open(struct inode *ino, struct file *filep)
{
- lock_kernel();
+ tty_lock();
/* enforce single access, vfd_is_open is protected by BKL */
if (vfd_is_open) {
- unlock_kernel();
+ tty_unlock();
return -EBUSY;
}
vfd_is_open = 1;
- unlock_kernel();
+ tty_unlock();
return 0;
}
diff --git a/drivers/char/cyclades.c b/drivers/char/cyclades.c
index 9824b4162904..27aad9422332 100644
--- a/drivers/char/cyclades.c
+++ b/drivers/char/cyclades.c
@@ -65,7 +65,6 @@
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/serial.h>
-#include <linux/smp_lock.h>
#include <linux/major.h>
#include <linux/string.h>
#include <linux/fcntl.h>
@@ -1608,7 +1607,7 @@ static int cy_open(struct tty_struct *tty, struct file *filp)
* If the port is the middle of closing, bail out now
*/
if (tty_hung_up_p(filp) || (info->port.flags & ASYNC_CLOSING)) {
- wait_event_interruptible(info->port.close_wait,
+ wait_event_interruptible_tty(info->port.close_wait,
!(info->port.flags & ASYNC_CLOSING));
return (info->port.flags & ASYNC_HUP_NOTIFY) ? -EAGAIN: -ERESTARTSYS;
}
@@ -1655,7 +1654,6 @@ static void cy_wait_until_sent(struct tty_struct *tty, int timeout)
return; /* Just in case.... */
orig_jiffies = jiffies;
- lock_kernel();
/*
* Set the check interval to be 1/5 of the estimated time to
* send a single character, and make it at least 1. The check
@@ -1702,7 +1700,6 @@ static void cy_wait_until_sent(struct tty_struct *tty, int timeout)
}
/* Run one more char cycle */
msleep_interruptible(jiffies_to_msecs(char_time * 5));
- unlock_kernel();
#ifdef CY_DEBUG_WAIT_UNTIL_SENT
printk(KERN_DEBUG "Clean (jiff=%lu)...done\n", jiffies);
#endif
@@ -1959,7 +1956,6 @@ static int cy_chars_in_buffer(struct tty_struct *tty)
int char_count;
__u32 tx_put, tx_get, tx_bufsize;
- lock_kernel();
tx_get = readl(&buf_ctrl->tx_get);
tx_put = readl(&buf_ctrl->tx_put);
tx_bufsize = readl(&buf_ctrl->tx_bufsize);
@@ -1971,7 +1967,6 @@ static int cy_chars_in_buffer(struct tty_struct *tty)
printk(KERN_DEBUG "cyc:cy_chars_in_buffer ttyC%d %d\n",
info->line, info->xmit_cnt + char_count);
#endif
- unlock_kernel();
return info->xmit_cnt + char_count;
}
#endif /* Z_EXT_CHARS_IN_BUFFER */
@@ -2359,17 +2354,22 @@ cy_set_serial_info(struct cyclades_port *info, struct tty_struct *tty,
struct serial_struct __user *new_info)
{
struct serial_struct new_serial;
+ int ret;
if (copy_from_user(&new_serial, new_info, sizeof(new_serial)))
return -EFAULT;
+ mutex_lock(&info->port.mutex);
if (!capable(CAP_SYS_ADMIN)) {
if (new_serial.close_delay != info->port.close_delay ||
new_serial.baud_base != info->baud ||
(new_serial.flags & ASYNC_FLAGS &
~ASYNC_USR_MASK) !=
(info->port.flags & ASYNC_FLAGS & ~ASYNC_USR_MASK))
+ {
+ mutex_unlock(&info->port.mutex);
return -EPERM;
+ }
info->port.flags = (info->port.flags & ~ASYNC_USR_MASK) |
(new_serial.flags & ASYNC_USR_MASK);
info->baud = new_serial.baud_base;
@@ -2392,10 +2392,12 @@ cy_set_serial_info(struct cyclades_port *info, struct tty_struct *tty,
check_and_exit:
if (info->port.flags & ASYNC_INITIALIZED) {
cy_set_line_char(info, tty);
- return 0;
+ ret = 0;
} else {
- return cy_startup(info, tty);
+ ret = cy_startup(info, tty);
}
+ mutex_unlock(&info->port.mutex);
+ return ret;
} /* set_serial_info */
/*
@@ -2438,7 +2440,6 @@ static int cy_tiocmget(struct tty_struct *tty, struct file *file)
card = info->card;
- lock_kernel();
if (!cy_is_Z(card)) {
unsigned long flags;
int channel = info->line - card->first_line;
@@ -2478,7 +2479,6 @@ static int cy_tiocmget(struct tty_struct *tty, struct file *file)
((lstatus & C_RS_CTS) ? TIOCM_CTS : 0);
}
end:
- unlock_kernel();
return result;
} /* cy_tiomget */
@@ -2696,7 +2696,6 @@ cy_ioctl(struct tty_struct *tty, struct file *file,
printk(KERN_DEBUG "cyc:cy_ioctl ttyC%d, cmd = %x arg = %lx\n",
info->line, cmd, arg);
#endif
- lock_kernel();
switch (cmd) {
case CYGETMON:
@@ -2817,7 +2816,6 @@ cy_ioctl(struct tty_struct *tty, struct file *file,
default:
ret_val = -ENOIOCTLCMD;
}
- unlock_kernel();
#ifdef CY_DEBUG_OTHER
printk(KERN_DEBUG "cyc:cy_ioctl done\n");
diff --git a/drivers/char/epca.c b/drivers/char/epca.c
index 6f5ffe1320f7..d9df46aa0fba 100644
--- a/drivers/char/epca.c
+++ b/drivers/char/epca.c
@@ -36,7 +36,7 @@
#include <linux/ctype.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
-#include <linux/smp_lock.h>
+#include <linux/slab.h>
#include <linux/ioport.h>
#include <linux/interrupt.h>
#include <linux/uaccess.h>
@@ -2105,7 +2105,6 @@ static int pc_ioctl(struct tty_struct *tty, struct file *file,
break;
case DIGI_SETAW:
case DIGI_SETAF:
- lock_kernel();
if (cmd == DIGI_SETAW) {
/* Setup an event to indicate when the transmit
buffer empties */
@@ -2118,7 +2117,6 @@ static int pc_ioctl(struct tty_struct *tty, struct file *file,
if (tty->ldisc->ops->flush_buffer)
tty->ldisc->ops->flush_buffer(tty);
}
- unlock_kernel();
/* Fall Thru */
case DIGI_SETA:
if (copy_from_user(&ch->digiext, argp, sizeof(digi_t)))
diff --git a/drivers/char/ip2/ip2main.c b/drivers/char/ip2/ip2main.c
index 911e1da6def2..07f3ea38b582 100644
--- a/drivers/char/ip2/ip2main.c
+++ b/drivers/char/ip2/ip2main.c
@@ -1486,7 +1486,9 @@ ip2_open( PTTY tty, struct file *pFile )
if ( tty_hung_up_p(pFile) || ( pCh->flags & ASYNC_CLOSING )) {
if ( pCh->flags & ASYNC_CLOSING ) {
+ tty_unlock();
schedule();
+ tty_lock();
}
if ( tty_hung_up_p(pFile) ) {
set_current_state( TASK_RUNNING );
@@ -1548,7 +1550,9 @@ ip2_open( PTTY tty, struct file *pFile )
rc = (( pCh->flags & ASYNC_HUP_NOTIFY ) ? -EAGAIN : -ERESTARTSYS);
break;
}
+ tty_unlock();
schedule();
+ tty_lock();
}
set_current_state( TASK_RUNNING );
remove_wait_queue(&pCh->open_wait, &wait);
diff --git a/drivers/char/isicom.c b/drivers/char/isicom.c
index 98310e1aae30..c27e9d21fea9 100644
--- a/drivers/char/isicom.c
+++ b/drivers/char/isicom.c
@@ -124,7 +124,6 @@
#include <linux/fs.h>
#include <linux/sched.h>
#include <linux/serial.h>
-#include <linux/smp_lock.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <linux/timer.h>
@@ -872,7 +871,6 @@ static struct tty_port *isicom_find_port(struct tty_struct *tty)
static int isicom_open(struct tty_struct *tty, struct file *filp)
{
struct isi_port *port;
- struct isi_board *card;
struct tty_port *tport;
tport = isicom_find_port(tty);
@@ -1118,8 +1116,7 @@ static int isicom_set_serial_info(struct tty_struct *tty,
if (copy_from_user(&newinfo, info, sizeof(newinfo)))
return -EFAULT;
- lock_kernel();
-
+ mutex_lock(&port->port.mutex);
reconfig_port = ((port->port.flags & ASYNC_SPD_MASK) !=
(newinfo.flags & ASYNC_SPD_MASK));
@@ -1128,7 +1125,7 @@ static int isicom_set_serial_info(struct tty_struct *tty,
(newinfo.closing_wait != port->port.closing_wait) ||
((newinfo.flags & ~ASYNC_USR_MASK) !=
(port->port.flags & ~ASYNC_USR_MASK))) {
- unlock_kernel();
+ mutex_unlock(&port->port.mutex);
return -EPERM;
}
port->port.flags = ((port->port.flags & ~ASYNC_USR_MASK) |
@@ -1145,7 +1142,7 @@ static int isicom_set_serial_info(struct tty_struct *tty,
isicom_config_port(tty);
spin_unlock_irqrestore(&port->card->card_lock, flags);
}
- unlock_kernel();
+ mutex_unlock(&port->port.mutex);
return 0;
}
@@ -1154,7 +1151,7 @@ static int isicom_get_serial_info(struct isi_port *port,
{
struct serial_struct out_info;
- lock_kernel();
+ mutex_lock(&port->port.mutex);
memset(&out_info, 0, sizeof(out_info));
/* out_info.type = ? */
out_info.line = port - isi_ports;
@@ -1164,7 +1161,7 @@ static int isicom_get_serial_info(struct isi_port *port,
/* out_info.baud_base = ? */
out_info.close_delay = port->port.close_delay;
out_info.closing_wait = port->port.closing_wait;
- unlock_kernel();
+ mutex_unlock(&port->port.mutex);
if (copy_to_user(info, &out_info, sizeof(out_info)))
return -EFAULT;
return 0;
diff --git a/drivers/char/istallion.c b/drivers/char/istallion.c
index 4e395c956a09..be28391adb79 100644
--- a/drivers/char/istallion.c
+++ b/drivers/char/istallion.c
@@ -203,9 +203,9 @@ static int stli_shared;
* the board has been detected, and whether it is actually running a slave
* or not.
*/
-#define BST_FOUND 0x1
-#define BST_STARTED 0x2
-#define BST_PROBED 0x4
+#define BST_FOUND 0
+#define BST_STARTED 1
+#define BST_PROBED 2
/*
* Define the set of port state flags. These are marked for internal
@@ -816,7 +816,7 @@ static int stli_open(struct tty_struct *tty, struct file *filp)
brdp = stli_brds[brdnr];
if (brdp == NULL)
return -ENODEV;
- if ((brdp->state & BST_STARTED) == 0)
+ if (!test_bit(BST_STARTED, &brdp->state))
return -ENODEV;
portnr = MINOR2PORT(minordev);
if (portnr > brdp->nrports)
@@ -954,7 +954,7 @@ static int stli_rawopen(struct stlibrd *brdp, struct stliport *portp, unsigned l
* order of opens and closes may not be preserved across shared
* memory, so we must wait until it is complete.
*/
- wait_event_interruptible(portp->raw_wait,
+ wait_event_interruptible_tty(portp->raw_wait,
!test_bit(ST_CLOSING, &portp->state));
if (signal_pending(current)) {
return -ERESTARTSYS;
@@ -989,7 +989,7 @@ static int stli_rawopen(struct stlibrd *brdp, struct stliport *portp, unsigned l
set_bit(ST_OPENING, &portp->state);
spin_unlock_irqrestore(&brd_lock, flags);
- wait_event_interruptible(portp->raw_wait,
+ wait_event_interruptible_tty(portp->raw_wait,
!test_bit(ST_OPENING, &portp->state));
if (signal_pending(current))
rc = -ERESTARTSYS;
@@ -1020,7 +1020,7 @@ static int stli_rawclose(struct stlibrd *brdp, struct stliport *portp, unsigned
* occurs on this port.
*/
if (wait) {
- wait_event_interruptible(portp->raw_wait,
+ wait_event_interruptible_tty(portp->raw_wait,
!test_bit(ST_CLOSING, &portp->state));
if (signal_pending(current)) {
return -ERESTARTSYS;
@@ -1052,7 +1052,7 @@ static int stli_rawclose(struct stlibrd *brdp, struct stliport *portp, unsigned
* to come back.
*/
rc = 0;
- wait_event_interruptible(portp->raw_wait,
+ wait_event_interruptible_tty(portp->raw_wait,
!test_bit(ST_CLOSING, &portp->state));
if (signal_pending(current))
rc = -ERESTARTSYS;
@@ -1073,6 +1073,10 @@ static int stli_rawclose(struct stlibrd *brdp, struct stliport *portp, unsigned
static int stli_cmdwait(struct stlibrd *brdp, struct stliport *portp, unsigned long cmd, void *arg, int size, int copyback)
{
+ /*
+ * no need for wait_event_tty because clearing ST_CMDING cannot block
+ * on BTM
+ */
wait_event_interruptible(portp->raw_wait,
!test_bit(ST_CMDING, &portp->state));
if (signal_pending(current))
@@ -1846,7 +1850,7 @@ static void stli_portinfo(struct seq_file *m, struct stlibrd *brdp, struct stlip
rc = stli_portcmdstats(NULL, portp);
uart = "UNKNOWN";
- if (brdp->state & BST_STARTED) {
+ if (test_bit(BST_STARTED, &brdp->state)) {
switch (stli_comstats.hwid) {
case 0: uart = "2681"; break;
case 1: uart = "SC26198"; break;
@@ -1855,7 +1859,7 @@ static void stli_portinfo(struct seq_file *m, struct stlibrd *brdp, struct stlip
}
seq_printf(m, "%d: uart:%s ", portnr, uart);
- if ((brdp->state & BST_STARTED) && (rc >= 0)) {
+ if (test_bit(BST_STARTED, &brdp->state) && rc >= 0) {
char sep;
seq_printf(m, "tx:%d rx:%d", (int) stli_comstats.txtotal,
@@ -2355,7 +2359,7 @@ static void stli_poll(unsigned long arg)
brdp = stli_brds[brdnr];
if (brdp == NULL)
continue;
- if ((brdp->state & BST_STARTED) == 0)
+ if (!test_bit(BST_STARTED, &brdp->state))
continue;
spin_lock(&brd_lock);
@@ -3140,7 +3144,7 @@ static int stli_initecp(struct stlibrd *brdp)
}
- brdp->state |= BST_FOUND;
+ set_bit(BST_FOUND, &brdp->state);
return 0;
err_unmap:
iounmap(brdp->membase);
@@ -3297,7 +3301,7 @@ static int stli_initonb(struct stlibrd *brdp)
brdp->panels[0] = brdp->nrports;
- brdp->state |= BST_FOUND;
+ set_bit(BST_FOUND, &brdp->state);
return 0;
err_unmap:
iounmap(brdp->membase);
@@ -3407,7 +3411,7 @@ stli_donestartup:
spin_unlock_irqrestore(&brd_lock, flags);
if (rc == 0)
- brdp->state |= BST_STARTED;
+ set_bit(BST_STARTED, &brdp->state);
if (! stli_timeron) {
stli_timeron++;
@@ -3710,7 +3714,7 @@ static int __devinit stli_pciprobe(struct pci_dev *pdev,
if (retval)
goto err_null;
- brdp->state |= BST_PROBED;
+ set_bit(BST_PROBED, &brdp->state);
pci_set_drvdata(pdev, brdp);
EBRDENABLE(brdp);
@@ -3841,7 +3845,7 @@ static int __init stli_initbrds(void)
brdp = stli_brds[i];
if (brdp == NULL)
continue;
- if (brdp->state & BST_FOUND) {
+ if (test_bit(BST_FOUND, &brdp->state)) {
EBRDENABLE(brdp);
brdp->enable = NULL;
brdp->disable = NULL;
@@ -4011,6 +4015,7 @@ static int stli_getbrdstats(combrd_t __user *bp)
return -ENODEV;
memset(&stli_brdstats, 0, sizeof(combrd_t));
+
stli_brdstats.brd = brdp->brdnr;
stli_brdstats.type = brdp->brdtype;
stli_brdstats.hwid = 0;
@@ -4076,10 +4081,13 @@ static int stli_portcmdstats(struct tty_struct *tty, struct stliport *portp)
if (brdp == NULL)
return -ENODEV;
- if (brdp->state & BST_STARTED) {
+ mutex_lock(&portp->port.mutex);
+ if (test_bit(BST_STARTED, &brdp->state)) {
if ((rc = stli_cmdwait(brdp, portp, A_GETSTATS,
- &stli_cdkstats, sizeof(asystats_t), 1)) < 0)
+ &stli_cdkstats, sizeof(asystats_t), 1)) < 0) {
+ mutex_unlock(&portp->port.mutex);
return rc;
+ }
} else {
memset(&stli_cdkstats, 0, sizeof(asystats_t));
}
@@ -4124,6 +4132,7 @@ static int stli_portcmdstats(struct tty_struct *tty, struct stliport *portp)
stli_comstats.modem = stli_cdkstats.dcdcnt;
stli_comstats.hwid = stli_cdkstats.hwid;
stli_comstats.signals = stli_mktiocm(stli_cdkstats.signals);
+ mutex_unlock(&portp->port.mutex);
return 0;
}
@@ -4186,15 +4195,20 @@ static int stli_clrportstats(struct stliport *portp, comstats_t __user *cp)
if (!brdp)
return -ENODEV;
- if (brdp->state & BST_STARTED) {
- if ((rc = stli_cmdwait(brdp, portp, A_CLEARSTATS, NULL, 0, 0)) < 0)
+ mutex_lock(&portp->port.mutex);
+
+ if (test_bit(BST_STARTED, &brdp->state)) {
+ if ((rc = stli_cmdwait(brdp, portp, A_CLEARSTATS, NULL, 0, 0)) < 0) {
+ mutex_unlock(&portp->port.mutex);
return rc;
+ }
}
memset(&stli_comstats, 0, sizeof(comstats_t));
stli_comstats.brd = portp->brdnr;
stli_comstats.panel = portp->panelnr;
stli_comstats.port = portp->portnr;
+ mutex_unlock(&portp->port.mutex);
if (copy_to_user(cp, &stli_comstats, sizeof(comstats_t)))
return -EFAULT;
@@ -4266,8 +4280,6 @@ static long stli_memioctl(struct file *fp, unsigned int cmd, unsigned long arg)
done = 0;
rc = 0;
- lock_kernel();
-
switch (cmd) {
case COM_GETPORTSTATS:
rc = stli_getportstats(NULL, NULL, argp);
@@ -4290,8 +4302,6 @@ static long stli_memioctl(struct file *fp, unsigned int cmd, unsigned long arg)
done++;
break;
}
- unlock_kernel();
-
if (done)
return rc;
@@ -4308,8 +4318,6 @@ static long stli_memioctl(struct file *fp, unsigned int cmd, unsigned long arg)
if (brdp->state == 0)
return -ENODEV;
- lock_kernel();
-
switch (cmd) {
case STL_BINTR:
EBRDINTR(brdp);
@@ -4318,10 +4326,10 @@ static long stli_memioctl(struct file *fp, unsigned int cmd, unsigned long arg)
rc = stli_startbrd(brdp);
break;
case STL_BSTOP:
- brdp->state &= ~BST_STARTED;
+ clear_bit(BST_STARTED, &brdp->state);
break;
case STL_BRESET:
- brdp->state &= ~BST_STARTED;
+ clear_bit(BST_STARTED, &brdp->state);
EBRDRESET(brdp);
if (stli_shared == 0) {
if (brdp->reenable != NULL)
@@ -4332,7 +4340,6 @@ static long stli_memioctl(struct file *fp, unsigned int cmd, unsigned long arg)
rc = -ENOIOCTLCMD;
break;
}
- unlock_kernel();
return rc;
}
@@ -4378,7 +4385,8 @@ static void istallion_cleanup_isa(void)
unsigned int j;
for (j = 0; (j < stli_nrbrds); j++) {
- if ((brdp = stli_brds[j]) == NULL || (brdp->state & BST_PROBED))
+ if ((brdp = stli_brds[j]) == NULL ||
+ test_bit(BST_PROBED, &brdp->state))
continue;
stli_cleanup_ports(brdp);
diff --git a/drivers/char/keyboard.c b/drivers/char/keyboard.c
index 25be2102a60a..a7ca75212bfe 100644
--- a/drivers/char/keyboard.c
+++ b/drivers/char/keyboard.c
@@ -299,7 +299,7 @@ int kbd_rate(struct kbd_repeat *rep)
*/
static void put_queue(struct vc_data *vc, int ch)
{
- struct tty_struct *tty = vc->vc_tty;
+ struct tty_struct *tty = vc->port.tty;
if (tty) {
tty_insert_flip_char(tty, ch, 0);
@@ -309,7 +309,7 @@ static void put_queue(struct vc_data *vc, int ch)
static void puts_queue(struct vc_data *vc, char *cp)
{
- struct tty_struct *tty = vc->vc_tty;
+ struct tty_struct *tty = vc->port.tty;
if (!tty)
return;
@@ -485,7 +485,7 @@ static void fn_show_ptregs(struct vc_data *vc)
static void fn_hold(struct vc_data *vc)
{
- struct tty_struct *tty = vc->vc_tty;
+ struct tty_struct *tty = vc->port.tty;
if (rep || !tty)
return;
@@ -563,7 +563,7 @@ static void fn_inc_console(struct vc_data *vc)
static void fn_send_intr(struct vc_data *vc)
{
- struct tty_struct *tty = vc->vc_tty;
+ struct tty_struct *tty = vc->port.tty;
if (!tty)
return;
@@ -1162,7 +1162,7 @@ static void kbd_keycode(unsigned int keycode, int down, int hw_raw)
struct keyboard_notifier_param param = { .vc = vc, .value = keycode, .down = down };
int rc;
- tty = vc->vc_tty;
+ tty = vc->port.tty;
if (tty && (!tty->driver_data)) {
/* No driver data? Strange. Okay we fix it then. */
diff --git a/drivers/char/mxser.c b/drivers/char/mxser.c
index d2692d443f7b..3fc89da856ae 100644
--- a/drivers/char/mxser.c
+++ b/drivers/char/mxser.c
@@ -2193,7 +2193,7 @@ static void mxser_transmit_chars(struct tty_struct *tty, struct mxser_port *port
port->mon_data.up_txcnt += (cnt - port->xmit_cnt);
port->icount.tx += (cnt - port->xmit_cnt);
- if (port->xmit_cnt < WAKEUP_CHARS && tty)
+ if (port->xmit_cnt < WAKEUP_CHARS)
tty_wakeup(tty);
if (port->xmit_cnt <= 0) {
diff --git a/drivers/char/n_gsm.c b/drivers/char/n_gsm.c
index e4089c432f15..099105e0894e 100644
--- a/drivers/char/n_gsm.c
+++ b/drivers/char/n_gsm.c
@@ -43,7 +43,6 @@
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/tty.h>
-#include <linux/timer.h>
#include <linux/ctype.h>
#include <linux/mm.h>
#include <linux/string.h>
diff --git a/drivers/char/n_hdlc.c b/drivers/char/n_hdlc.c
index c68118efad84..47d32281032c 100644
--- a/drivers/char/n_hdlc.c
+++ b/drivers/char/n_hdlc.c
@@ -598,18 +598,18 @@ static ssize_t n_hdlc_tty_read(struct tty_struct *tty, struct file *file,
return -EFAULT;
}
- lock_kernel();
+ tty_lock();
for (;;) {
if (test_bit(TTY_OTHER_CLOSED, &tty->flags)) {
- unlock_kernel();
+ tty_unlock();
return -EIO;
}
n_hdlc = tty2n_hdlc (tty);
if (!n_hdlc || n_hdlc->magic != HDLC_MAGIC ||
tty != n_hdlc->tty) {
- unlock_kernel();
+ tty_unlock();
return 0;
}
@@ -619,13 +619,13 @@ static ssize_t n_hdlc_tty_read(struct tty_struct *tty, struct file *file,
/* no data */
if (file->f_flags & O_NONBLOCK) {
- unlock_kernel();
+ tty_unlock();
return -EAGAIN;
}
interruptible_sleep_on (&tty->read_wait);
if (signal_pending(current)) {
- unlock_kernel();
+ tty_unlock();
return -EINTR;
}
}
@@ -648,7 +648,7 @@ static ssize_t n_hdlc_tty_read(struct tty_struct *tty, struct file *file,
kfree(rbuf);
else
n_hdlc_buf_put(&n_hdlc->rx_free_buf_list,rbuf);
- unlock_kernel();
+ tty_unlock();
return ret;
} /* end of n_hdlc_tty_read() */
@@ -691,7 +691,7 @@ static ssize_t n_hdlc_tty_write(struct tty_struct *tty, struct file *file,
count = maxframe;
}
- lock_kernel();
+ tty_lock();
add_wait_queue(&tty->write_wait, &wait);
set_current_state(TASK_INTERRUPTIBLE);
@@ -731,7 +731,7 @@ static ssize_t n_hdlc_tty_write(struct tty_struct *tty, struct file *file,
n_hdlc_buf_put(&n_hdlc->tx_buf_list,tbuf);
n_hdlc_send_frames(n_hdlc,tty);
}
- unlock_kernel();
+ tty_unlock();
return error;
} /* end of n_hdlc_tty_write() */
diff --git a/drivers/char/n_r3964.c b/drivers/char/n_r3964.c
index c1d8b54c816d..a98290d7a2c5 100644
--- a/drivers/char/n_r3964.c
+++ b/drivers/char/n_r3964.c
@@ -1067,7 +1067,7 @@ static ssize_t r3964_read(struct tty_struct *tty, struct file *file,
TRACE_L("read()");
- lock_kernel();
+ tty_lock();
pClient = findClient(pInfo, task_pid(current));
if (pClient) {
@@ -1079,7 +1079,7 @@ static ssize_t r3964_read(struct tty_struct *tty, struct file *file,
goto unlock;
}
/* block until there is a message: */
- wait_event_interruptible(pInfo->read_wait,
+ wait_event_interruptible_tty(pInfo->read_wait,
(pMsg = remove_msg(pInfo, pClient)));
}
@@ -1109,7 +1109,7 @@ static ssize_t r3964_read(struct tty_struct *tty, struct file *file,
}
ret = -EPERM;
unlock:
- unlock_kernel();
+ tty_unlock();
return ret;
}
@@ -1158,7 +1158,7 @@ static ssize_t r3964_write(struct tty_struct *tty, struct file *file,
pHeader->locks = 0;
pHeader->owner = NULL;
- lock_kernel();
+ tty_lock();
pClient = findClient(pInfo, task_pid(current));
if (pClient) {
@@ -1177,7 +1177,7 @@ static ssize_t r3964_write(struct tty_struct *tty, struct file *file,
add_tx_queue(pInfo, pHeader);
trigger_transmit(pInfo);
- unlock_kernel();
+ tty_unlock();
return 0;
}
diff --git a/drivers/char/n_tty.c b/drivers/char/n_tty.c
index bdae8327143c..428f4fe0b5f7 100644
--- a/drivers/char/n_tty.c
+++ b/drivers/char/n_tty.c
@@ -1102,6 +1102,11 @@ static inline void n_tty_receive_char(struct tty_struct *tty, unsigned char c)
if (I_IUCLC(tty) && L_IEXTEN(tty))
c = tolower(c);
+ if (L_EXTPROC(tty)) {
+ put_tty_queue(c, tty);
+ return;
+ }
+
if (tty->stopped && !tty->flow_stopped && I_IXON(tty) &&
I_IXANY(tty) && c != START_CHAR(tty) && c != STOP_CHAR(tty) &&
c != INTR_CHAR(tty) && c != QUIT_CHAR(tty) && c != SUSP_CHAR(tty)) {
@@ -1409,7 +1414,8 @@ static void n_tty_receive_buf(struct tty_struct *tty, const unsigned char *cp,
n_tty_set_room(tty);
- if (!tty->icanon && (tty->read_cnt >= tty->minimum_to_wake)) {
+ if ((!tty->icanon && (tty->read_cnt >= tty->minimum_to_wake)) ||
+ L_EXTPROC(tty)) {
kill_fasync(&tty->fasync, SIGIO, POLL_IN);
if (waitqueue_active(&tty->read_wait))
wake_up_interruptible(&tty->read_wait);
@@ -1585,7 +1591,7 @@ static int n_tty_open(struct tty_struct *tty)
static inline int input_available_p(struct tty_struct *tty, int amt)
{
tty_flush_to_ldisc(tty);
- if (tty->icanon) {
+ if (tty->icanon && !L_EXTPROC(tty)) {
if (tty->canon_data)
return 1;
} else if (tty->read_cnt >= (amt ? amt : 1))
@@ -1632,6 +1638,11 @@ static int copy_from_read_buf(struct tty_struct *tty,
spin_lock_irqsave(&tty->read_lock, flags);
tty->read_tail = (tty->read_tail + n) & (N_TTY_BUF_SIZE-1);
tty->read_cnt -= n;
+ /* Turn single EOF into zero-length read */
+ if (L_EXTPROC(tty) && tty->icanon && n == 1) {
+ if (!tty->read_cnt && (*b)[n-1] == EOF_CHAR(tty))
+ n--;
+ }
spin_unlock_irqrestore(&tty->read_lock, flags);
*b += n;
*nr -= n;
@@ -1812,7 +1823,7 @@ do_it_again:
nr--;
}
- if (tty->icanon) {
+ if (tty->icanon && !L_EXTPROC(tty)) {
/* N.B. avoid overrun if nr == 0 */
while (nr && tty->read_cnt) {
int eol;
diff --git a/drivers/char/nozomi.c b/drivers/char/nozomi.c
index a6638003f530..18af923093c3 100644
--- a/drivers/char/nozomi.c
+++ b/drivers/char/nozomi.c
@@ -1611,6 +1611,8 @@ static int ntty_install(struct tty_driver *driver, struct tty_struct *tty)
ret = tty_init_termios(tty);
if (ret == 0) {
tty_driver_kref_get(driver);
+ tty->count++;
+ tty->driver_data = port;
driver->ttys[tty->index] = tty;
}
return ret;
@@ -1639,7 +1641,7 @@ static int ntty_activate(struct tty_port *tport, struct tty_struct *tty)
static int ntty_open(struct tty_struct *tty, struct file *filp)
{
- struct port *port = get_port_by_tty(tty);
+ struct port *port = tty->driver_data;
return tty_port_open(&port->port, tty, filp);
}
diff --git a/drivers/char/pty.c b/drivers/char/pty.c
index d83a43130df4..ad46eae1f9bb 100644
--- a/drivers/char/pty.c
+++ b/drivers/char/pty.c
@@ -62,7 +62,9 @@ static void pty_close(struct tty_struct *tty, struct file *filp)
if (tty->driver == ptm_driver)
devpts_pty_kill(tty->link);
#endif
+ tty_unlock();
tty_vhangup(tty->link);
+ tty_lock();
}
}
@@ -171,6 +173,23 @@ static int pty_set_lock(struct tty_struct *tty, int __user *arg)
return 0;
}
+/* Send a signal to the slave */
+static int pty_signal(struct tty_struct *tty, int sig)
+{
+ unsigned long flags;
+ struct pid *pgrp;
+
+ if (tty->link) {
+ spin_lock_irqsave(&tty->link->ctrl_lock, flags);
+ pgrp = get_pid(tty->link->pgrp);
+ spin_unlock_irqrestore(&tty->link->ctrl_lock, flags);
+
+ kill_pgrp(pgrp, sig, 1);
+ put_pid(pgrp);
+ }
+ return 0;
+}
+
static void pty_flush_buffer(struct tty_struct *tty)
{
struct tty_struct *to = tty->link;
@@ -321,6 +340,8 @@ static int pty_bsd_ioctl(struct tty_struct *tty, struct file *file,
switch (cmd) {
case TIOCSPTLCK: /* Set PT Lock (disallow slave open) */
return pty_set_lock(tty, (int __user *) arg);
+ case TIOCSIG: /* Send signal to other side of pty */
+ return pty_signal(tty, (int) arg);
}
return -ENOIOCTLCMD;
}
@@ -476,6 +497,8 @@ static int pty_unix98_ioctl(struct tty_struct *tty, struct file *file,
return pty_set_lock(tty, (int __user *)arg);
case TIOCGPTN: /* Get PT Number */
return put_user(tty->index, (unsigned int __user *)arg);
+ case TIOCSIG: /* Send signal to other side of pty */
+ return pty_signal(tty, (int) arg);
}
return -ENOIOCTLCMD;
@@ -626,7 +649,7 @@ static const struct tty_operations pty_unix98_ops = {
* allocated_ptys_lock handles the list of free pty numbers
*/
-static int __ptmx_open(struct inode *inode, struct file *filp)
+static int ptmx_open(struct inode *inode, struct file *filp)
{
struct tty_struct *tty;
int retval;
@@ -635,11 +658,14 @@ static int __ptmx_open(struct inode *inode, struct file *filp)
nonseekable_open(inode, filp);
/* find a device that is not in use. */
+ tty_lock();
index = devpts_new_index(inode);
+ tty_unlock();
if (index < 0)
return index;
mutex_lock(&tty_mutex);
+ tty_lock();
tty = tty_init_dev(ptm_driver, index, 1);
mutex_unlock(&tty_mutex);
@@ -657,26 +683,21 @@ static int __ptmx_open(struct inode *inode, struct file *filp)
goto out1;
retval = ptm_driver->ops->open(tty, filp);
- if (!retval)
- return 0;
+ if (retval)
+ goto out2;
out1:
+ tty_unlock();
+ return retval;
+out2:
+ tty_unlock();
tty_release(inode, filp);
return retval;
out:
devpts_kill_index(inode, index);
+ tty_unlock();
return retval;
}
-static int ptmx_open(struct inode *inode, struct file *filp)
-{
- int ret;
-
- lock_kernel();
- ret = __ptmx_open(inode, filp);
- unlock_kernel();
- return ret;
-}
-
static struct file_operations ptmx_fops;
static void __init unix98_pty_init(void)
diff --git a/drivers/char/riscom8.c b/drivers/char/riscom8.c
index b02332a5412f..af4de1fe8445 100644
--- a/drivers/char/riscom8.c
+++ b/drivers/char/riscom8.c
@@ -47,7 +47,6 @@
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/tty_flip.h>
-#include <linux/smp_lock.h>
#include <linux/spinlock.h>
#include <linux/device.h>
@@ -1184,6 +1183,7 @@ static int rc_set_serial_info(struct tty_struct *tty, struct riscom_port *port,
if (copy_from_user(&tmp, newinfo, sizeof(tmp)))
return -EFAULT;
+ mutex_lock(&port->port.mutex);
change_speed = ((port->port.flags & ASYNC_SPD_MASK) !=
(tmp.flags & ASYNC_SPD_MASK));
@@ -1191,8 +1191,10 @@ static int rc_set_serial_info(struct tty_struct *tty, struct riscom_port *port,
if ((tmp.close_delay != port->port.close_delay) ||
(tmp.closing_wait != port->port.closing_wait) ||
((tmp.flags & ~ASYNC_USR_MASK) !=
- (port->port.flags & ~ASYNC_USR_MASK)))
+ (port->port.flags & ~ASYNC_USR_MASK))) {
+ mutex_unlock(&port->port.mutex);
return -EPERM;
+ }
port->port.flags = ((port->port.flags & ~ASYNC_USR_MASK) |
(tmp.flags & ASYNC_USR_MASK));
} else {
@@ -1208,6 +1210,7 @@ static int rc_set_serial_info(struct tty_struct *tty, struct riscom_port *port,
rc_change_speed(tty, bp, port);
spin_unlock_irqrestore(&riscom_lock, flags);
}
+ mutex_unlock(&port->port.mutex);
return 0;
}
@@ -1220,12 +1223,15 @@ static int rc_get_serial_info(struct riscom_port *port,
memset(&tmp, 0, sizeof(tmp));
tmp.type = PORT_CIRRUS;
tmp.line = port - rc_port;
+
+ mutex_lock(&port->port.mutex);
tmp.port = bp->base;
tmp.irq = bp->irq;
tmp.flags = port->port.flags;
tmp.baud_base = (RC_OSCFREQ + CD180_TPC/2) / CD180_TPC;
tmp.close_delay = port->port.close_delay * HZ/100;
tmp.closing_wait = port->port.closing_wait * HZ/100;
+ mutex_unlock(&port->port.mutex);
tmp.xmit_fifo_size = CD180_NFIFO;
return copy_to_user(retinfo, &tmp, sizeof(tmp)) ? -EFAULT : 0;
}
@@ -1242,14 +1248,10 @@ static int rc_ioctl(struct tty_struct *tty, struct file *filp,
switch (cmd) {
case TIOCGSERIAL:
- lock_kernel();
retval = rc_get_serial_info(port, argp);
- unlock_kernel();
break;
case TIOCSSERIAL:
- lock_kernel();
retval = rc_set_serial_info(tty, port, argp);
- unlock_kernel();
break;
default:
retval = -ENOIOCTLCMD;
diff --git a/drivers/char/rocket.c b/drivers/char/rocket.c
index 0e29a23ec4c5..79c3bc69165a 100644
--- a/drivers/char/rocket.c
+++ b/drivers/char/rocket.c
@@ -73,7 +73,6 @@
#include <linux/tty_driver.h>
#include <linux/tty_flip.h>
#include <linux/serial.h>
-#include <linux/smp_lock.h>
#include <linux/string.h>
#include <linux/fcntl.h>
#include <linux/ptrace.h>
@@ -1017,6 +1016,7 @@ static void rp_close(struct tty_struct *tty, struct file *filp)
if (tty_port_close_start(port, tty, filp) == 0)
return;
+ mutex_lock(&port->mutex);
cp = &info->channel;
/*
* Before we drop DTR, make sure the UART transmitter
@@ -1060,9 +1060,13 @@ static void rp_close(struct tty_struct *tty, struct file *filp)
info->xmit_buf = NULL;
}
}
+ spin_lock_irq(&port->lock);
info->port.flags &= ~(ASYNC_INITIALIZED | ASYNC_CLOSING | ASYNC_NORMAL_ACTIVE);
tty->closing = 0;
+ spin_unlock_irq(&port->lock);
+ mutex_unlock(&port->mutex);
tty_port_tty_set(port, NULL);
+
wake_up_interruptible(&port->close_wait);
complete_all(&info->close_wait);
atomic_dec(&rp_num_ports_open);
@@ -1210,11 +1214,13 @@ static int get_config(struct r_port *info, struct rocket_config __user *retinfo)
if (!retinfo)
return -EFAULT;
memset(&tmp, 0, sizeof (tmp));
+ mutex_lock(&info->port.mutex);
tmp.line = info->line;
tmp.flags = info->flags;
tmp.close_delay = info->port.close_delay;
tmp.closing_wait = info->port.closing_wait;
tmp.port = rcktpt_io_addr[(info->line >> 5) & 3];
+ mutex_unlock(&info->port.mutex);
if (copy_to_user(retinfo, &tmp, sizeof (*retinfo)))
return -EFAULT;
@@ -1229,10 +1235,13 @@ static int set_config(struct tty_struct *tty, struct r_port *info,
if (copy_from_user(&new_serial, new_info, sizeof (new_serial)))
return -EFAULT;
+ mutex_lock(&info->port.mutex);
if (!capable(CAP_SYS_ADMIN))
{
- if ((new_serial.flags & ~ROCKET_USR_MASK) != (info->flags & ~ROCKET_USR_MASK))
+ if ((new_serial.flags & ~ROCKET_USR_MASK) != (info->flags & ~ROCKET_USR_MASK)) {
+ mutex_unlock(&info->port.mutex);
return -EPERM;
+ }
info->flags = ((info->flags & ~ROCKET_USR_MASK) | (new_serial.flags & ROCKET_USR_MASK));
configure_r_port(tty, info, NULL);
return 0;
@@ -1250,6 +1259,7 @@ static int set_config(struct tty_struct *tty, struct r_port *info,
tty->alt_speed = 230400;
if ((info->flags & ROCKET_SPD_MASK) == ROCKET_SPD_WARP)
tty->alt_speed = 460800;
+ mutex_unlock(&info->port.mutex);
configure_r_port(tty, info, NULL);
return 0;
@@ -1325,8 +1335,6 @@ static int rp_ioctl(struct tty_struct *tty, struct file *file,
if (cmd != RCKP_GET_PORTS && rocket_paranoia_check(info, "rp_ioctl"))
return -ENXIO;
- lock_kernel();
-
switch (cmd) {
case RCKP_GET_STRUCT:
if (copy_to_user(argp, info, sizeof (struct r_port)))
@@ -1350,7 +1358,6 @@ static int rp_ioctl(struct tty_struct *tty, struct file *file,
default:
ret = -ENOIOCTLCMD;
}
- unlock_kernel();
return ret;
}
@@ -1471,7 +1478,6 @@ static void rp_wait_until_sent(struct tty_struct *tty, int timeout)
jiffies);
printk(KERN_INFO "cps=%d...\n", info->cps);
#endif
- lock_kernel();
while (1) {
txcnt = sGetTxCnt(cp);
if (!txcnt) {
@@ -1499,7 +1505,6 @@ static void rp_wait_until_sent(struct tty_struct *tty, int timeout)
break;
}
__set_current_state(TASK_RUNNING);
- unlock_kernel();
#ifdef ROCKET_DEBUG_WAIT_UNTIL_SENT
printk(KERN_INFO "txcnt = %d (jiff=%lu)...done\n", txcnt, jiffies);
#endif
@@ -1512,6 +1517,7 @@ static void rp_hangup(struct tty_struct *tty)
{
CHANNEL_t *cp;
struct r_port *info = tty->driver_data;
+ unsigned long flags;
if (rocket_paranoia_check(info, "rp_hangup"))
return;
@@ -1520,11 +1526,15 @@ static void rp_hangup(struct tty_struct *tty)
printk(KERN_INFO "rp_hangup of ttyR%d...\n", info->line);
#endif
rp_flush_buffer(tty);
- if (info->port.flags & ASYNC_CLOSING)
+ spin_lock_irqsave(&info->port.lock, flags);
+ if (info->port.flags & ASYNC_CLOSING) {
+ spin_unlock_irqrestore(&info->port.lock, flags);
return;
+ }
if (info->port.count)
atomic_dec(&rp_num_ports_open);
clear_bit((info->aiop * 8) + info->chan, (void *) &xmit_flags[info->board]);
+ spin_unlock_irqrestore(&info->port.lock, flags);
tty_port_hangup(&info->port);
@@ -1535,7 +1545,7 @@ static void rp_hangup(struct tty_struct *tty)
sDisCTSFlowCtl(cp);
sDisTxSoftFlowCtl(cp);
sClrTxXOFF(cp);
- info->port.flags &= ~ASYNC_INITIALIZED;
+ clear_bit(ASYNCB_INITIALIZED, &info->port.flags);
wake_up_interruptible(&info->port.open_wait);
}
diff --git a/drivers/char/selection.c b/drivers/char/selection.c
index f97b9e848064..ebae344ce910 100644
--- a/drivers/char/selection.c
+++ b/drivers/char/selection.c
@@ -26,6 +26,7 @@
#include <linux/selection.h>
#include <linux/tiocl.h>
#include <linux/console.h>
+#include <linux/smp_lock.h>
/* Don't take this from <ctype.h>: 011-015 on the screen aren't spaces */
#define isspace(c) ((c) == ' ')
@@ -312,12 +313,20 @@ int paste_selection(struct tty_struct *tty)
struct tty_ldisc *ld;
DECLARE_WAITQUEUE(wait, current);
+ /* always called with BTM from vt_ioctl */
+ WARN_ON(!tty_locked());
+
acquire_console_sem();
poke_blanked_console();
release_console_sem();
- ld = tty_ldisc_ref_wait(tty);
-
+ ld = tty_ldisc_ref(tty);
+ if (!ld) {
+ tty_unlock();
+ ld = tty_ldisc_ref_wait(tty);
+ tty_lock();
+ }
+
add_wait_queue(&vc->paste_wait, &wait);
while (sel_buffer && sel_buffer_lth > pasted) {
set_current_state(TASK_INTERRUPTIBLE);
diff --git a/drivers/char/serial167.c b/drivers/char/serial167.c
index ecbe479c7d68..f646725bd567 100644
--- a/drivers/char/serial167.c
+++ b/drivers/char/serial167.c
@@ -1505,7 +1505,7 @@ cy_ioctl(struct tty_struct *tty, struct file *file,
printk("cy_ioctl %s, cmd = %x arg = %lx\n", tty->name, cmd, arg); /* */
#endif
- lock_kernel();
+ tty_lock();
switch (cmd) {
case CYGETMON:
@@ -1561,7 +1561,7 @@ cy_ioctl(struct tty_struct *tty, struct file *file,
default:
ret_val = -ENOIOCTLCMD;
}
- unlock_kernel();
+ tty_unlock();
#ifdef SERIAL_DEBUG_OTHER
printk("cy_ioctl done\n");
@@ -1786,7 +1786,9 @@ block_til_ready(struct tty_struct *tty, struct file *filp,
tty->name, info->count);
/**/
#endif
- schedule();
+ tty_unlock();
+ schedule();
+ tty_lock();
}
__set_current_state(TASK_RUNNING);
remove_wait_queue(&info->open_wait, &wait);
diff --git a/drivers/char/specialix.c b/drivers/char/specialix.c
index 2c24fcdc722a..9f8495b4fc8f 100644
--- a/drivers/char/specialix.c
+++ b/drivers/char/specialix.c
@@ -1365,7 +1365,9 @@ static int block_til_ready(struct tty_struct *tty, struct file *filp,
retval = -ERESTARTSYS;
break;
}
+ tty_unlock();
schedule();
+ tty_lock();
}
set_current_state(TASK_RUNNING);
@@ -1863,8 +1865,7 @@ static int sx_set_serial_info(struct specialix_port *port,
return -EFAULT;
}
- lock_kernel();
-
+ mutex_lock(&port->port.mutex);
change_speed = ((port->port.flags & ASYNC_SPD_MASK) !=
(tmp.flags & ASYNC_SPD_MASK));
change_speed |= (tmp.custom_divisor != port->custom_divisor);
@@ -1875,7 +1876,7 @@ static int sx_set_serial_info(struct specialix_port *port,
((tmp.flags & ~ASYNC_USR_MASK) !=
(port->port.flags & ~ASYNC_USR_MASK))) {
func_exit();
- unlock_kernel();
+ mutex_unlock(&port->port.mutex);
return -EPERM;
}
port->port.flags = ((port->port.flags & ~ASYNC_USR_MASK) |
@@ -1892,7 +1893,7 @@ static int sx_set_serial_info(struct specialix_port *port,
sx_change_speed(bp, port);
func_exit();
- unlock_kernel();
+ mutex_unlock(&port->port.mutex);
return 0;
}
@@ -1906,7 +1907,7 @@ static int sx_get_serial_info(struct specialix_port *port,
func_enter();
memset(&tmp, 0, sizeof(tmp));
- lock_kernel();
+ mutex_lock(&port->port.mutex);
tmp.type = PORT_CIRRUS;
tmp.line = port - sx_port;
tmp.port = bp->base;
@@ -1917,7 +1918,7 @@ static int sx_get_serial_info(struct specialix_port *port,
tmp.closing_wait = port->port.closing_wait * HZ/100;
tmp.custom_divisor = port->custom_divisor;
tmp.xmit_fifo_size = CD186x_NFIFO;
- unlock_kernel();
+ mutex_unlock(&port->port.mutex);
if (copy_to_user(retinfo, &tmp, sizeof(tmp))) {
func_exit();
return -EFAULT;
diff --git a/drivers/char/stallion.c b/drivers/char/stallion.c
index 6049fd731924..f2167f8e5aab 100644
--- a/drivers/char/stallion.c
+++ b/drivers/char/stallion.c
@@ -807,7 +807,6 @@ static void stl_waituntilsent(struct tty_struct *tty, int timeout)
timeout = HZ;
tend = jiffies + timeout;
- lock_kernel();
while (stl_datastate(portp)) {
if (signal_pending(current))
break;
@@ -815,7 +814,6 @@ static void stl_waituntilsent(struct tty_struct *tty, int timeout)
if (time_after_eq(jiffies, tend))
break;
}
- unlock_kernel();
}
/*****************************************************************************/
@@ -1029,6 +1027,8 @@ static int stl_getserial(struct stlport *portp, struct serial_struct __user *sp)
pr_debug("stl_getserial(portp=%p,sp=%p)\n", portp, sp);
memset(&sio, 0, sizeof(struct serial_struct));
+
+ mutex_lock(&portp->port.mutex);
sio.line = portp->portnr;
sio.port = portp->ioaddr;
sio.flags = portp->port.flags;
@@ -1048,6 +1048,7 @@ static int stl_getserial(struct stlport *portp, struct serial_struct __user *sp)
brdp = stl_brds[portp->brdnr];
if (brdp != NULL)
sio.irq = brdp->irq;
+ mutex_unlock(&portp->port.mutex);
return copy_to_user(sp, &sio, sizeof(struct serial_struct)) ? -EFAULT : 0;
}
@@ -1069,12 +1070,15 @@ static int stl_setserial(struct tty_struct *tty, struct serial_struct __user *sp
if (copy_from_user(&sio, sp, sizeof(struct serial_struct)))
return -EFAULT;
+ mutex_lock(&portp->port.mutex);
if (!capable(CAP_SYS_ADMIN)) {
if ((sio.baud_base != portp->baud_base) ||
(sio.close_delay != portp->close_delay) ||
((sio.flags & ~ASYNC_USR_MASK) !=
- (portp->port.flags & ~ASYNC_USR_MASK)))
+ (portp->port.flags & ~ASYNC_USR_MASK))) {
+ mutex_unlock(&portp->port.mutex);
return -EPERM;
+ }
}
portp->port.flags = (portp->port.flags & ~ASYNC_USR_MASK) |
@@ -1083,6 +1087,7 @@ static int stl_setserial(struct tty_struct *tty, struct serial_struct __user *sp
portp->close_delay = sio.close_delay;
portp->closing_wait = sio.closing_wait;
portp->custom_divisor = sio.custom_divisor;
+ mutex_unlock(&portp->port.mutex);
stl_setport(portp, tty->termios);
return 0;
}
@@ -1147,8 +1152,6 @@ static int stl_ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd
rc = 0;
- lock_kernel();
-
switch (cmd) {
case TIOCGSERIAL:
rc = stl_getserial(portp, argp);
@@ -1173,7 +1176,6 @@ static int stl_ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd
rc = -ENOIOCTLCMD;
break;
}
- unlock_kernel();
return rc;
}
@@ -2327,6 +2329,7 @@ static int stl_getportstats(struct tty_struct *tty, struct stlport *portp, comst
return -ENODEV;
}
+ mutex_lock(&portp->port.mutex);
portp->stats.state = portp->istate;
portp->stats.flags = portp->port.flags;
portp->stats.hwid = portp->hwid;
@@ -2358,6 +2361,7 @@ static int stl_getportstats(struct tty_struct *tty, struct stlport *portp, comst
(STL_TXBUFSIZE - (tail - head));
portp->stats.signals = (unsigned long) stl_getsignals(portp);
+ mutex_unlock(&portp->port.mutex);
return copy_to_user(cp, &portp->stats,
sizeof(comstats_t)) ? -EFAULT : 0;
@@ -2382,10 +2386,12 @@ static int stl_clrportstats(struct stlport *portp, comstats_t __user *cp)
return -ENODEV;
}
+ mutex_lock(&portp->port.mutex);
memset(&portp->stats, 0, sizeof(comstats_t));
portp->stats.brd = portp->brdnr;
portp->stats.panel = portp->panelnr;
portp->stats.port = portp->portnr;
+ mutex_unlock(&portp->port.mutex);
return copy_to_user(cp, &portp->stats,
sizeof(comstats_t)) ? -EFAULT : 0;
}
@@ -2451,7 +2457,6 @@ static long stl_memioctl(struct file *fp, unsigned int cmd, unsigned long arg)
return -ENODEV;
rc = 0;
- lock_kernel();
switch (cmd) {
case COM_GETPORTSTATS:
rc = stl_getportstats(NULL, NULL, argp);
@@ -2472,7 +2477,6 @@ static long stl_memioctl(struct file *fp, unsigned int cmd, unsigned long arg)
rc = -ENOIOCTLCMD;
break;
}
- unlock_kernel();
return rc;
}
diff --git a/drivers/char/sx.c b/drivers/char/sx.c
index a81ec4fcf6ff..5b24db4ff7f1 100644
--- a/drivers/char/sx.c
+++ b/drivers/char/sx.c
@@ -1699,7 +1699,7 @@ static long sx_fw_ioctl(struct file *filp, unsigned int cmd,
if (!capable(CAP_SYS_RAWIO))
return -EPERM;
- lock_kernel();
+ tty_lock();
sx_dprintk(SX_DEBUG_FIRMWARE, "IOCTL %x: %lx\n", cmd, arg);
@@ -1848,7 +1848,7 @@ static long sx_fw_ioctl(struct file *filp, unsigned int cmd,
break;
}
out:
- unlock_kernel();
+ tty_unlock();
func_exit();
return rc;
}
@@ -1859,7 +1859,7 @@ static int sx_break(struct tty_struct *tty, int flag)
int rv;
func_enter();
- lock_kernel();
+ tty_lock();
if (flag)
rv = sx_send_command(port, HS_START, -1, HS_IDLE_BREAK);
@@ -1868,7 +1868,7 @@ static int sx_break(struct tty_struct *tty, int flag)
if (rv != 1)
printk(KERN_ERR "sx: couldn't send break (%x).\n",
read_sx_byte(port->board, CHAN_OFFSET(port, hi_hstat)));
- unlock_kernel();
+ tty_unlock();
func_exit();
return 0;
}
@@ -1909,7 +1909,7 @@ static int sx_ioctl(struct tty_struct *tty, struct file *filp,
/* func_enter2(); */
rc = 0;
- lock_kernel();
+ tty_lock();
switch (cmd) {
case TIOCGSERIAL:
rc = gs_getserial(&port->gs, argp);
@@ -1921,7 +1921,7 @@ static int sx_ioctl(struct tty_struct *tty, struct file *filp,
rc = -ENOIOCTLCMD;
break;
}
- unlock_kernel();
+ tty_unlock();
/* func_exit(); */
return rc;
diff --git a/drivers/char/synclink.c b/drivers/char/synclink.c
index 0658fc548222..a2a58004e188 100644
--- a/drivers/char/synclink.c
+++ b/drivers/char/synclink.c
@@ -81,7 +81,6 @@
#include <linux/mm.h>
#include <linux/seq_file.h>
#include <linux/slab.h>
-#include <linux/smp_lock.h>
#include <linux/delay.h>
#include <linux/netdevice.h>
#include <linux/vmalloc.h>
@@ -2436,7 +2435,9 @@ static int mgsl_get_stats(struct mgsl_struct * info, struct mgsl_icount __user *
if (!user_icount) {
memset(&info->icount, 0, sizeof(info->icount));
} else {
+ mutex_lock(&info->port.mutex);
COPY_TO_USER(err, user_icount, &info->icount, sizeof(struct mgsl_icount));
+ mutex_unlock(&info->port.mutex);
if (err)
return -EFAULT;
}
@@ -2461,7 +2462,9 @@ static int mgsl_get_params(struct mgsl_struct * info, MGSL_PARAMS __user *user_p
printk("%s(%d):mgsl_get_params(%s)\n",
__FILE__,__LINE__, info->device_name);
+ mutex_lock(&info->port.mutex);
COPY_TO_USER(err,user_params, &info->params, sizeof(MGSL_PARAMS));
+ mutex_unlock(&info->port.mutex);
if (err) {
if ( debug_level >= DEBUG_LEVEL_INFO )
printk( "%s(%d):mgsl_get_params(%s) user buffer copy failed\n",
@@ -2501,11 +2504,13 @@ static int mgsl_set_params(struct mgsl_struct * info, MGSL_PARAMS __user *new_pa
return -EFAULT;
}
+ mutex_lock(&info->port.mutex);
spin_lock_irqsave(&info->irq_spinlock,flags);
memcpy(&info->params,&tmp_params,sizeof(MGSL_PARAMS));
spin_unlock_irqrestore(&info->irq_spinlock,flags);
mgsl_change_params(info);
+ mutex_unlock(&info->port.mutex);
return 0;
@@ -2935,7 +2940,6 @@ static int mgsl_ioctl(struct tty_struct *tty, struct file * file,
unsigned int cmd, unsigned long arg)
{
struct mgsl_struct * info = tty->driver_data;
- int ret;
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s(%d):mgsl_ioctl %s cmd=%08X\n", __FILE__,__LINE__,
@@ -2950,10 +2954,7 @@ static int mgsl_ioctl(struct tty_struct *tty, struct file * file,
return -EIO;
}
- lock_kernel();
- ret = mgsl_ioctl_common(info, cmd, arg);
- unlock_kernel();
- return ret;
+ return mgsl_ioctl_common(info, cmd, arg);
}
static int mgsl_ioctl_common(struct mgsl_struct *info, unsigned int cmd, unsigned long arg)
@@ -3109,12 +3110,14 @@ static void mgsl_close(struct tty_struct *tty, struct file * filp)
if (tty_port_close_start(&info->port, tty, filp) == 0)
goto cleanup;
-
+
+ mutex_lock(&info->port.mutex);
if (info->port.flags & ASYNC_INITIALIZED)
mgsl_wait_until_sent(tty, info->timeout);
mgsl_flush_buffer(tty);
tty_ldisc_flush(tty);
shutdown(info);
+ mutex_unlock(&info->port.mutex);
tty_port_close_end(&info->port, tty);
info->port.tty = NULL;
@@ -3162,7 +3165,6 @@ static void mgsl_wait_until_sent(struct tty_struct *tty, int timeout)
* Note: use tight timings here to satisfy the NIST-PCTS.
*/
- lock_kernel();
if ( info->params.data_rate ) {
char_time = info->timeout/(32 * 5);
if (!char_time)
@@ -3192,7 +3194,6 @@ static void mgsl_wait_until_sent(struct tty_struct *tty, int timeout)
break;
}
}
- unlock_kernel();
exit:
if (debug_level >= DEBUG_LEVEL_INFO)
@@ -3348,7 +3349,9 @@ static int block_til_ready(struct tty_struct *tty, struct file * filp,
printk("%s(%d):block_til_ready blocking on %s count=%d\n",
__FILE__,__LINE__, tty->driver->name, port->count );
+ tty_unlock();
schedule();
+ tty_lock();
}
set_current_state(TASK_RUNNING);
diff --git a/drivers/char/synclink_gt.c b/drivers/char/synclink_gt.c
index 334cf5c8c8b6..fef80cfcab5c 100644
--- a/drivers/char/synclink_gt.c
+++ b/drivers/char/synclink_gt.c
@@ -40,8 +40,8 @@
#define DBGBH(fmt) if (debug_level >= DEBUG_LEVEL_BH) printk fmt
#define DBGISR(fmt) if (debug_level >= DEBUG_LEVEL_ISR) printk fmt
#define DBGDATA(info, buf, size, label) if (debug_level >= DEBUG_LEVEL_DATA) trace_block((info), (buf), (size), (label))
-//#define DBGTBUF(info) dump_tbufs(info)
-//#define DBGRBUF(info) dump_rbufs(info)
+/*#define DBGTBUF(info) dump_tbufs(info)*/
+/*#define DBGRBUF(info) dump_rbufs(info)*/
#include <linux/module.h>
@@ -62,7 +62,6 @@
#include <linux/mm.h>
#include <linux/seq_file.h>
#include <linux/slab.h>
-#include <linux/smp_lock.h>
#include <linux/netdevice.h>
#include <linux/vmalloc.h>
#include <linux/init.h>
@@ -676,12 +675,14 @@ static int open(struct tty_struct *tty, struct file *filp)
goto cleanup;
}
+ mutex_lock(&info->port.mutex);
info->port.tty->low_latency = (info->port.flags & ASYNC_LOW_LATENCY) ? 1 : 0;
spin_lock_irqsave(&info->netlock, flags);
if (info->netcount) {
retval = -EBUSY;
spin_unlock_irqrestore(&info->netlock, flags);
+ mutex_unlock(&info->port.mutex);
goto cleanup;
}
info->port.count++;
@@ -693,7 +694,7 @@ static int open(struct tty_struct *tty, struct file *filp)
if (retval < 0)
goto cleanup;
}
-
+ mutex_unlock(&info->port.mutex);
retval = block_til_ready(tty, filp, info);
if (retval) {
DBGINFO(("%s block_til_ready rc=%d\n", info->device_name, retval));
@@ -725,12 +726,14 @@ static void close(struct tty_struct *tty, struct file *filp)
if (tty_port_close_start(&info->port, tty, filp) == 0)
goto cleanup;
+ mutex_lock(&info->port.mutex);
if (info->port.flags & ASYNC_INITIALIZED)
wait_until_sent(tty, info->timeout);
flush_buffer(tty);
tty_ldisc_flush(tty);
shutdown(info);
+ mutex_unlock(&info->port.mutex);
tty_port_close_end(&info->port, tty);
info->port.tty = NULL;
@@ -741,17 +744,23 @@ cleanup:
static void hangup(struct tty_struct *tty)
{
struct slgt_info *info = tty->driver_data;
+ unsigned long flags;
if (sanity_check(info, tty->name, "hangup"))
return;
DBGINFO(("%s hangup\n", info->device_name));
flush_buffer(tty);
+
+ mutex_lock(&info->port.mutex);
shutdown(info);
+ spin_lock_irqsave(&info->port.lock, flags);
info->port.count = 0;
info->port.flags &= ~ASYNC_NORMAL_ACTIVE;
info->port.tty = NULL;
+ spin_unlock_irqrestore(&info->port.lock, flags);
+ mutex_unlock(&info->port.mutex);
wake_up_interruptible(&info->port.open_wait);
}
@@ -901,8 +910,6 @@ static void wait_until_sent(struct tty_struct *tty, int timeout)
* Note: use tight timings here to satisfy the NIST-PCTS.
*/
- lock_kernel();
-
if (info->params.data_rate) {
char_time = info->timeout/(32 * 5);
if (!char_time)
@@ -920,8 +927,6 @@ static void wait_until_sent(struct tty_struct *tty, int timeout)
if (timeout && time_after(jiffies, orig_jiffies + timeout))
break;
}
- unlock_kernel();
-
exit:
DBGINFO(("%s wait_until_sent exit\n", info->device_name));
}
@@ -1041,8 +1046,37 @@ static int ioctl(struct tty_struct *tty, struct file *file,
return -EIO;
}
- lock_kernel();
-
+ switch (cmd) {
+ case MGSL_IOCWAITEVENT:
+ return wait_mgsl_event(info, argp);
+ case TIOCMIWAIT:
+ return modem_input_wait(info,(int)arg);
+ case TIOCGICOUNT:
+ spin_lock_irqsave(&info->lock,flags);
+ cnow = info->icount;
+ spin_unlock_irqrestore(&info->lock,flags);
+ p_cuser = argp;
+ if (put_user(cnow.cts, &p_cuser->cts) ||
+ put_user(cnow.dsr, &p_cuser->dsr) ||
+ put_user(cnow.rng, &p_cuser->rng) ||
+ put_user(cnow.dcd, &p_cuser->dcd) ||
+ put_user(cnow.rx, &p_cuser->rx) ||
+ put_user(cnow.tx, &p_cuser->tx) ||
+ put_user(cnow.frame, &p_cuser->frame) ||
+ put_user(cnow.overrun, &p_cuser->overrun) ||
+ put_user(cnow.parity, &p_cuser->parity) ||
+ put_user(cnow.brk, &p_cuser->brk) ||
+ put_user(cnow.buf_overrun, &p_cuser->buf_overrun))
+ return -EFAULT;
+ return 0;
+ case MGSL_IOCSGPIO:
+ return set_gpio(info, argp);
+ case MGSL_IOCGGPIO:
+ return get_gpio(info, argp);
+ case MGSL_IOCWAITGPIO:
+ return wait_gpio(info, argp);
+ }
+ mutex_lock(&info->port.mutex);
switch (cmd) {
case MGSL_IOCGPARAMS:
ret = get_params(info, argp);
@@ -1068,50 +1102,16 @@ static int ioctl(struct tty_struct *tty, struct file *file,
case MGSL_IOCGSTATS:
ret = get_stats(info, argp);
break;
- case MGSL_IOCWAITEVENT:
- ret = wait_mgsl_event(info, argp);
- break;
- case TIOCMIWAIT:
- ret = modem_input_wait(info,(int)arg);
- break;
case MGSL_IOCGIF:
ret = get_interface(info, argp);
break;
case MGSL_IOCSIF:
ret = set_interface(info,(int)arg);
break;
- case MGSL_IOCSGPIO:
- ret = set_gpio(info, argp);
- break;
- case MGSL_IOCGGPIO:
- ret = get_gpio(info, argp);
- break;
- case MGSL_IOCWAITGPIO:
- ret = wait_gpio(info, argp);
- break;
- case TIOCGICOUNT:
- spin_lock_irqsave(&info->lock,flags);
- cnow = info->icount;
- spin_unlock_irqrestore(&info->lock,flags);
- p_cuser = argp;
- if (put_user(cnow.cts, &p_cuser->cts) ||
- put_user(cnow.dsr, &p_cuser->dsr) ||
- put_user(cnow.rng, &p_cuser->rng) ||
- put_user(cnow.dcd, &p_cuser->dcd) ||
- put_user(cnow.rx, &p_cuser->rx) ||
- put_user(cnow.tx, &p_cuser->tx) ||
- put_user(cnow.frame, &p_cuser->frame) ||
- put_user(cnow.overrun, &p_cuser->overrun) ||
- put_user(cnow.parity, &p_cuser->parity) ||
- put_user(cnow.brk, &p_cuser->brk) ||
- put_user(cnow.buf_overrun, &p_cuser->buf_overrun))
- ret = -EFAULT;
- ret = 0;
- break;
default:
ret = -ENOIOCTLCMD;
}
- unlock_kernel();
+ mutex_unlock(&info->port.mutex);
return ret;
}
@@ -3244,7 +3244,9 @@ static int block_til_ready(struct tty_struct *tty, struct file *filp,
}
DBGINFO(("%s block_til_ready wait\n", tty->driver->name));
+ tty_unlock();
schedule();
+ tty_lock();
}
set_current_state(TASK_RUNNING);
diff --git a/drivers/char/synclinkmp.c b/drivers/char/synclinkmp.c
index 2b18adc4ee19..e56caf7d82aa 100644
--- a/drivers/char/synclinkmp.c
+++ b/drivers/char/synclinkmp.c
@@ -52,7 +52,6 @@
#include <linux/mm.h>
#include <linux/seq_file.h>
#include <linux/slab.h>
-#include <linux/smp_lock.h>
#include <linux/netdevice.h>
#include <linux/vmalloc.h>
#include <linux/init.h>
@@ -813,13 +812,15 @@ static void close(struct tty_struct *tty, struct file *filp)
if (tty_port_close_start(&info->port, tty, filp) == 0)
goto cleanup;
-
+
+ mutex_lock(&info->port.mutex);
if (info->port.flags & ASYNC_INITIALIZED)
wait_until_sent(tty, info->timeout);
flush_buffer(tty);
tty_ldisc_flush(tty);
shutdown(info);
+ mutex_unlock(&info->port.mutex);
tty_port_close_end(&info->port, tty);
info->port.tty = NULL;
@@ -835,6 +836,7 @@ cleanup:
static void hangup(struct tty_struct *tty)
{
SLMP_INFO *info = tty->driver_data;
+ unsigned long flags;
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s(%d):%s hangup()\n",
@@ -843,12 +845,16 @@ static void hangup(struct tty_struct *tty)
if (sanity_check(info, tty->name, "hangup"))
return;
+ mutex_lock(&info->port.mutex);
flush_buffer(tty);
shutdown(info);
+ spin_lock_irqsave(&info->port.lock, flags);
info->port.count = 0;
info->port.flags &= ~ASYNC_NORMAL_ACTIVE;
info->port.tty = NULL;
+ spin_unlock_irqrestore(&info->port.lock, flags);
+ mutex_unlock(&info->port.mutex);
wake_up_interruptible(&info->port.open_wait);
}
@@ -1062,9 +1068,7 @@ static void wait_until_sent(struct tty_struct *tty, int timeout)
if (sanity_check(info, tty->name, "wait_until_sent"))
return;
- lock_kernel();
-
- if (!(info->port.flags & ASYNC_INITIALIZED))
+ if (!test_bit(ASYNCB_INITIALIZED, &info->port.flags))
goto exit;
orig_jiffies = jiffies;
@@ -1094,8 +1098,10 @@ static void wait_until_sent(struct tty_struct *tty, int timeout)
break;
}
} else {
- //TODO: determine if there is something similar to USC16C32
- // TXSTATUS_ALL_SENT status
+ /*
+ * TODO: determine if there is something similar to USC16C32
+ * TXSTATUS_ALL_SENT status
+ */
while ( info->tx_active && info->tx_enabled) {
msleep_interruptible(jiffies_to_msecs(char_time));
if (signal_pending(current))
@@ -1106,7 +1112,6 @@ static void wait_until_sent(struct tty_struct *tty, int timeout)
}
exit:
- unlock_kernel();
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s(%d):%s wait_until_sent() exit\n",
__FILE__,__LINE__, info->device_name );
@@ -1122,7 +1127,6 @@ static int write_room(struct tty_struct *tty)
if (sanity_check(info, tty->name, "write_room"))
return 0;
- lock_kernel();
if (info->params.mode == MGSL_MODE_HDLC) {
ret = (info->tx_active) ? 0 : HDLC_MAX_FRAME_SIZE;
} else {
@@ -1130,7 +1134,6 @@ static int write_room(struct tty_struct *tty)
if (ret < 0)
ret = 0;
}
- unlock_kernel();
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s(%d):%s write_room()=%d\n",
@@ -1251,7 +1254,7 @@ static void tx_release(struct tty_struct *tty)
*
* Return Value: 0 if success, otherwise error code
*/
-static int do_ioctl(struct tty_struct *tty, struct file *file,
+static int ioctl(struct tty_struct *tty, struct file *file,
unsigned int cmd, unsigned long arg)
{
SLMP_INFO *info = tty->driver_data;
@@ -1341,16 +1344,6 @@ static int do_ioctl(struct tty_struct *tty, struct file *file,
return 0;
}
-static int ioctl(struct tty_struct *tty, struct file *file,
- unsigned int cmd, unsigned long arg)
-{
- int ret;
- lock_kernel();
- ret = do_ioctl(tty, file, cmd, arg);
- unlock_kernel();
- return ret;
-}
-
/*
* /proc fs routines....
*/
@@ -2883,7 +2876,9 @@ static int get_stats(SLMP_INFO * info, struct mgsl_icount __user *user_icount)
if (!user_icount) {
memset(&info->icount, 0, sizeof(info->icount));
} else {
+ mutex_lock(&info->port.mutex);
COPY_TO_USER(err, user_icount, &info->icount, sizeof(struct mgsl_icount));
+ mutex_unlock(&info->port.mutex);
if (err)
return -EFAULT;
}
@@ -2898,7 +2893,9 @@ static int get_params(SLMP_INFO * info, MGSL_PARAMS __user *user_params)
printk("%s(%d):%s get_params()\n",
__FILE__,__LINE__, info->device_name);
+ mutex_lock(&info->port.mutex);
COPY_TO_USER(err,user_params, &info->params, sizeof(MGSL_PARAMS));
+ mutex_unlock(&info->port.mutex);
if (err) {
if ( debug_level >= DEBUG_LEVEL_INFO )
printk( "%s(%d):%s get_params() user buffer copy failed\n",
@@ -2926,11 +2923,13 @@ static int set_params(SLMP_INFO * info, MGSL_PARAMS __user *new_params)
return -EFAULT;
}
+ mutex_lock(&info->port.mutex);
spin_lock_irqsave(&info->lock,flags);
memcpy(&info->params,&tmp_params,sizeof(MGSL_PARAMS));
spin_unlock_irqrestore(&info->lock,flags);
change_params(info);
+ mutex_unlock(&info->port.mutex);
return 0;
}
@@ -3366,7 +3365,9 @@ static int block_til_ready(struct tty_struct *tty, struct file *filp,
printk("%s(%d):%s block_til_ready() count=%d\n",
__FILE__,__LINE__, tty->driver->name, port->count );
+ tty_unlock();
schedule();
+ tty_lock();
}
set_current_state(TASK_RUNNING);
diff --git a/drivers/char/tty_io.c b/drivers/char/tty_io.c
index 507441ac6edb..0350c42375a2 100644
--- a/drivers/char/tty_io.c
+++ b/drivers/char/tty_io.c
@@ -149,6 +149,7 @@ static long tty_compat_ioctl(struct file *file, unsigned int cmd,
#else
#define tty_compat_ioctl NULL
#endif
+static int __tty_fasync(int fd, struct file *filp, int on);
static int tty_fasync(int fd, struct file *filp, int on);
static void release_tty(struct tty_struct *tty, int idx);
static void __proc_set_tty(struct task_struct *tsk, struct tty_struct *tty);
@@ -470,7 +471,7 @@ void tty_wakeup(struct tty_struct *tty)
EXPORT_SYMBOL_GPL(tty_wakeup);
/**
- * do_tty_hangup - actual handler for hangup events
+ * __tty_hangup - actual handler for hangup events
* @work: tty device
*
* This can be called by the "eventd" kernel thread. That is process
@@ -483,7 +484,7 @@ EXPORT_SYMBOL_GPL(tty_wakeup);
* remains intact.
*
* Locking:
- * BKL
+ * BTM
* redirect lock for undoing redirection
* file list lock for manipulating list of ttys
* tty_ldisc_lock from called functions
@@ -491,10 +492,8 @@ EXPORT_SYMBOL_GPL(tty_wakeup);
* tasklist_lock to walk task list for hangup event
* ->siglock to protect ->signal/->sighand
*/
-static void do_tty_hangup(struct work_struct *work)
+void __tty_hangup(struct tty_struct *tty)
{
- struct tty_struct *tty =
- container_of(work, struct tty_struct, hangup_work);
struct file *cons_filp = NULL;
struct file *filp, *f = NULL;
struct task_struct *p;
@@ -513,9 +512,12 @@ static void do_tty_hangup(struct work_struct *work)
}
spin_unlock(&redirect_lock);
- /* inuse_filps is protected by the single kernel lock */
- lock_kernel();
- check_tty_count(tty, "do_tty_hangup");
+ tty_lock();
+
+ /* inuse_filps is protected by the single tty lock,
+ this really needs to change if we want to flush the
+ workqueue with the lock held */
+ check_tty_count(tty, "tty_hangup");
file_list_lock();
/* This breaks for file handles being sent over AF_UNIX sockets ? */
@@ -525,7 +527,7 @@ static void do_tty_hangup(struct work_struct *work)
if (filp->f_op->write != tty_write)
continue;
closecount++;
- tty_fasync(-1, filp, 0); /* can't block */
+ __tty_fasync(-1, filp, 0); /* can't block */
filp->f_op = &hung_up_tty_fops;
}
file_list_unlock();
@@ -594,11 +596,21 @@ static void do_tty_hangup(struct work_struct *work)
*/
set_bit(TTY_HUPPED, &tty->flags);
tty_ldisc_enable(tty);
- unlock_kernel();
+
+ tty_unlock();
+
if (f)
fput(f);
}
+static void do_tty_hangup(struct work_struct *work)
+{
+ struct tty_struct *tty =
+ container_of(work, struct tty_struct, hangup_work);
+
+ __tty_hangup(tty);
+}
+
/**
* tty_hangup - trigger a hangup event
* @tty: tty to hangup
@@ -634,11 +646,12 @@ void tty_vhangup(struct tty_struct *tty)
printk(KERN_DEBUG "%s vhangup...\n", tty_name(tty, buf));
#endif
- do_tty_hangup(&tty->hangup_work);
+ __tty_hangup(tty);
}
EXPORT_SYMBOL(tty_vhangup);
+
/**
* tty_vhangup_self - process vhangup for own ctty
*
@@ -696,7 +709,8 @@ static void session_clear_tty(struct pid *session)
* exiting; it is 0 if called by the ioctl TIOCNOTTY.
*
* Locking:
- * BKL is taken for hysterical raisins
+ * BTM is taken for hysterical raisins, and held when
+ * called from no_tty().
* tty_mutex is taken to protect tty
* ->siglock is taken to protect ->signal/->sighand
* tasklist_lock is taken to walk process list for sessions
@@ -714,10 +728,10 @@ void disassociate_ctty(int on_exit)
tty = get_current_tty();
if (tty) {
tty_pgrp = get_pid(tty->pgrp);
- lock_kernel();
- if (on_exit && tty->driver->type != TTY_DRIVER_TYPE_PTY)
- tty_vhangup(tty);
- unlock_kernel();
+ if (on_exit) {
+ if (tty->driver->type != TTY_DRIVER_TYPE_PTY)
+ tty_vhangup(tty);
+ }
tty_kref_put(tty);
} else if (on_exit) {
struct pid *old_pgrp;
@@ -774,9 +788,9 @@ void disassociate_ctty(int on_exit)
void no_tty(void)
{
struct task_struct *tsk = current;
- lock_kernel();
+ tty_lock();
disassociate_ctty(0);
- unlock_kernel();
+ tty_unlock();
proc_clear_tty(tsk);
}
@@ -879,7 +893,7 @@ static ssize_t tty_read(struct file *file, char __user *buf, size_t count,
struct inode *inode;
struct tty_ldisc *ld;
- tty = (struct tty_struct *)file->private_data;
+ tty = file->private_data;
inode = file->f_path.dentry->d_inode;
if (tty_paranoia_check(tty, inode, "tty_read"))
return -EIO;
@@ -1013,19 +1027,19 @@ out:
* We don't put it into the syslog queue right now maybe in the future if
* really needed.
*
- * We must still hold the BKL and test the CLOSING flag for the moment.
+ * We must still hold the BTM and test the CLOSING flag for the moment.
*/
void tty_write_message(struct tty_struct *tty, char *msg)
{
if (tty) {
mutex_lock(&tty->atomic_write_lock);
- lock_kernel();
+ tty_lock();
if (tty->ops->write && !test_bit(TTY_CLOSING, &tty->flags)) {
- unlock_kernel();
+ tty_unlock();
tty->ops->write(tty, msg, strlen(msg));
} else
- unlock_kernel();
+ tty_unlock();
tty_write_unlock(tty);
}
return;
@@ -1056,7 +1070,7 @@ static ssize_t tty_write(struct file *file, const char __user *buf,
ssize_t ret;
struct tty_ldisc *ld;
- tty = (struct tty_struct *)file->private_data;
+ tty = file->private_data;
if (tty_paranoia_check(tty, inode, "tty_write"))
return -EIO;
if (!tty || !tty->ops->write ||
@@ -1208,18 +1222,14 @@ static int tty_driver_install_tty(struct tty_driver *driver,
int ret;
if (driver->ops->install) {
- lock_kernel();
ret = driver->ops->install(driver, tty);
- unlock_kernel();
return ret;
}
if (tty_init_termios(tty) == 0) {
- lock_kernel();
tty_driver_kref_get(driver);
tty->count++;
driver->ttys[idx] = tty;
- unlock_kernel();
return 0;
}
return -ENOMEM;
@@ -1312,14 +1322,11 @@ struct tty_struct *tty_init_dev(struct tty_driver *driver, int idx,
struct tty_struct *tty;
int retval;
- lock_kernel();
/* Check if pty master is being opened multiple times */
if (driver->subtype == PTY_TYPE_MASTER &&
(driver->flags & TTY_DRIVER_DEVPTS_MEM) && !first_ok) {
- unlock_kernel();
return ERR_PTR(-EIO);
}
- unlock_kernel();
/*
* First time open is complex, especially for PTY devices.
@@ -1363,9 +1370,7 @@ release_mem_out:
if (printk_ratelimit())
printk(KERN_INFO "tty_init_dev: ldisc open failed, "
"clearing slot %d\n", idx);
- lock_kernel();
release_tty(tty, idx);
- unlock_kernel();
return ERR_PTR(retval);
}
@@ -1508,14 +1513,14 @@ int tty_release(struct inode *inode, struct file *filp)
int idx;
char buf[64];
- tty = (struct tty_struct *)filp->private_data;
+ tty = filp->private_data;
if (tty_paranoia_check(tty, inode, "tty_release_dev"))
return 0;
- lock_kernel();
+ tty_lock();
check_tty_count(tty, "tty_release_dev");
- tty_fasync(-1, filp, 0);
+ __tty_fasync(-1, filp, 0);
idx = tty->index;
pty_master = (tty->driver->type == TTY_DRIVER_TYPE_PTY &&
@@ -1527,18 +1532,18 @@ int tty_release(struct inode *inode, struct file *filp)
if (idx < 0 || idx >= tty->driver->num) {
printk(KERN_DEBUG "tty_release_dev: bad idx when trying to "
"free (%s)\n", tty->name);
- unlock_kernel();
+ tty_unlock();
return 0;
}
if (!devpts) {
if (tty != tty->driver->ttys[idx]) {
- unlock_kernel();
+ tty_unlock();
printk(KERN_DEBUG "tty_release_dev: driver.table[%d] not tty "
"for (%s)\n", idx, tty->name);
return 0;
}
if (tty->termios != tty->driver->termios[idx]) {
- unlock_kernel();
+ tty_unlock();
printk(KERN_DEBUG "tty_release_dev: driver.termios[%d] not termios "
"for (%s)\n",
idx, tty->name);
@@ -1556,21 +1561,21 @@ int tty_release(struct inode *inode, struct file *filp)
if (tty->driver->other &&
!(tty->driver->flags & TTY_DRIVER_DEVPTS_MEM)) {
if (o_tty != tty->driver->other->ttys[idx]) {
- unlock_kernel();
+ tty_unlock();
printk(KERN_DEBUG "tty_release_dev: other->table[%d] "
"not o_tty for (%s)\n",
idx, tty->name);
return 0 ;
}
if (o_tty->termios != tty->driver->other->termios[idx]) {
- unlock_kernel();
+ tty_unlock();
printk(KERN_DEBUG "tty_release_dev: other->termios[%d] "
"not o_termios for (%s)\n",
idx, tty->name);
return 0;
}
if (o_tty->link != tty) {
- unlock_kernel();
+ tty_unlock();
printk(KERN_DEBUG "tty_release_dev: bad pty pointers\n");
return 0;
}
@@ -1579,7 +1584,7 @@ int tty_release(struct inode *inode, struct file *filp)
if (tty->ops->close)
tty->ops->close(tty, filp);
- unlock_kernel();
+ tty_unlock();
/*
* Sanity check: if tty->count is going to zero, there shouldn't be
* any waiters on tty->read_wait or tty->write_wait. We test the
@@ -1602,7 +1607,7 @@ int tty_release(struct inode *inode, struct file *filp)
opens on /dev/tty */
mutex_lock(&tty_mutex);
- lock_kernel();
+ tty_lock();
tty_closing = tty->count <= 1;
o_tty_closing = o_tty &&
(o_tty->count <= (pty_master ? 1 : 0));
@@ -1633,7 +1638,7 @@ int tty_release(struct inode *inode, struct file *filp)
printk(KERN_WARNING "tty_release_dev: %s: read/write wait queue "
"active!\n", tty_name(tty, buf));
- unlock_kernel();
+ tty_unlock();
mutex_unlock(&tty_mutex);
schedule();
}
@@ -1698,7 +1703,7 @@ int tty_release(struct inode *inode, struct file *filp)
/* check whether both sides are closing ... */
if (!tty_closing || (o_tty && !o_tty_closing)) {
- unlock_kernel();
+ tty_unlock();
return 0;
}
@@ -1718,7 +1723,7 @@ int tty_release(struct inode *inode, struct file *filp)
/* Make this pty number available for reallocation */
if (devpts)
devpts_kill_index(inode, idx);
- unlock_kernel();
+ tty_unlock();
return 0;
}
@@ -1760,12 +1765,12 @@ retry_open:
retval = 0;
mutex_lock(&tty_mutex);
- lock_kernel();
+ tty_lock();
if (device == MKDEV(TTYAUX_MAJOR, 0)) {
tty = get_current_tty();
if (!tty) {
- unlock_kernel();
+ tty_unlock();
mutex_unlock(&tty_mutex);
return -ENXIO;
}
@@ -1797,14 +1802,14 @@ retry_open:
goto got_driver;
}
}
- unlock_kernel();
+ tty_unlock();
mutex_unlock(&tty_mutex);
return -ENODEV;
}
driver = get_tty_driver(device, &index);
if (!driver) {
- unlock_kernel();
+ tty_unlock();
mutex_unlock(&tty_mutex);
return -ENODEV;
}
@@ -1814,7 +1819,7 @@ got_driver:
tty = tty_driver_lookup_tty(driver, inode, index);
if (IS_ERR(tty)) {
- unlock_kernel();
+ tty_unlock();
mutex_unlock(&tty_mutex);
return PTR_ERR(tty);
}
@@ -1830,7 +1835,7 @@ got_driver:
mutex_unlock(&tty_mutex);
tty_driver_kref_put(driver);
if (IS_ERR(tty)) {
- unlock_kernel();
+ tty_unlock();
return PTR_ERR(tty);
}
@@ -1860,29 +1865,29 @@ got_driver:
printk(KERN_DEBUG "error %d in opening %s...", retval,
tty->name);
#endif
+ tty_unlock(); /* need to call tty_release without BTM */
tty_release(inode, filp);
- if (retval != -ERESTARTSYS) {
- unlock_kernel();
+ if (retval != -ERESTARTSYS)
return retval;
- }
- if (signal_pending(current)) {
- unlock_kernel();
+
+ if (signal_pending(current))
return retval;
- }
+
schedule();
/*
* Need to reset f_op in case a hangup happened.
*/
+ tty_lock();
if (filp->f_op == &hung_up_tty_fops)
filp->f_op = &tty_fops;
- unlock_kernel();
+ tty_unlock();
goto retry_open;
}
- unlock_kernel();
+ tty_unlock();
mutex_lock(&tty_mutex);
- lock_kernel();
+ tty_lock();
spin_lock_irq(&current->sighand->siglock);
if (!noctty &&
current->signal->leader &&
@@ -1890,7 +1895,7 @@ got_driver:
tty->session == NULL)
__proc_set_tty(current, tty);
spin_unlock_irq(&current->sighand->siglock);
- unlock_kernel();
+ tty_unlock();
mutex_unlock(&tty_mutex);
return 0;
}
@@ -1915,7 +1920,7 @@ static unsigned int tty_poll(struct file *filp, poll_table *wait)
struct tty_ldisc *ld;
int ret = 0;
- tty = (struct tty_struct *)filp->private_data;
+ tty = filp->private_data;
if (tty_paranoia_check(tty, filp->f_path.dentry->d_inode, "tty_poll"))
return 0;
@@ -1926,14 +1931,13 @@ static unsigned int tty_poll(struct file *filp, poll_table *wait)
return ret;
}
-static int tty_fasync(int fd, struct file *filp, int on)
+static int __tty_fasync(int fd, struct file *filp, int on)
{
struct tty_struct *tty;
unsigned long flags;
int retval = 0;
- lock_kernel();
- tty = (struct tty_struct *)filp->private_data;
+ tty = filp->private_data;
if (tty_paranoia_check(tty, filp->f_path.dentry->d_inode, "tty_fasync"))
goto out;
@@ -1966,7 +1970,15 @@ static int tty_fasync(int fd, struct file *filp, int on)
}
retval = 0;
out:
- unlock_kernel();
+ return retval;
+}
+
+static int tty_fasync(int fd, struct file *filp, int on)
+{
+ int retval;
+ tty_lock();
+ retval = __tty_fasync(fd, filp, on);
+ tty_unlock();
return retval;
}
@@ -2485,7 +2497,7 @@ long tty_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
struct tty_ldisc *ld;
struct inode *inode = file->f_dentry->d_inode;
- tty = (struct tty_struct *)file->private_data;
+ tty = file->private_data;
if (tty_paranoia_check(tty, inode, "tty_ioctl"))
return -EINVAL;
diff --git a/drivers/char/tty_ioctl.c b/drivers/char/tty_ioctl.c
index 6bd5f8866c74..0c1889971459 100644
--- a/drivers/char/tty_ioctl.c
+++ b/drivers/char/tty_ioctl.c
@@ -517,19 +517,25 @@ static void change_termios(struct tty_struct *tty, struct ktermios *new_termios)
/* See if packet mode change of state. */
if (tty->link && tty->link->packet) {
+ int extproc = (old_termios.c_lflag & EXTPROC) |
+ (tty->termios->c_lflag & EXTPROC);
int old_flow = ((old_termios.c_iflag & IXON) &&
(old_termios.c_cc[VSTOP] == '\023') &&
(old_termios.c_cc[VSTART] == '\021'));
int new_flow = (I_IXON(tty) &&
STOP_CHAR(tty) == '\023' &&
START_CHAR(tty) == '\021');
- if (old_flow != new_flow) {
+ if ((old_flow != new_flow) || extproc) {
spin_lock_irqsave(&tty->ctrl_lock, flags);
- tty->ctrl_status &= ~(TIOCPKT_DOSTOP | TIOCPKT_NOSTOP);
- if (new_flow)
- tty->ctrl_status |= TIOCPKT_DOSTOP;
- else
- tty->ctrl_status |= TIOCPKT_NOSTOP;
+ if (old_flow != new_flow) {
+ tty->ctrl_status &= ~(TIOCPKT_DOSTOP | TIOCPKT_NOSTOP);
+ if (new_flow)
+ tty->ctrl_status |= TIOCPKT_DOSTOP;
+ else
+ tty->ctrl_status |= TIOCPKT_NOSTOP;
+ }
+ if (extproc)
+ tty->ctrl_status |= TIOCPKT_IOCTL;
spin_unlock_irqrestore(&tty->ctrl_lock, flags);
wake_up_interruptible(&tty->link->read_wait);
}
diff --git a/drivers/char/tty_ldisc.c b/drivers/char/tty_ldisc.c
index 500e740ec5e4..412f9775d19c 100644
--- a/drivers/char/tty_ldisc.c
+++ b/drivers/char/tty_ldisc.c
@@ -440,6 +440,8 @@ static void tty_set_termios_ldisc(struct tty_struct *tty, int num)
*
* A helper opening method. Also a convenient debugging and check
* point.
+ *
+ * Locking: always called with BTM already held.
*/
static int tty_ldisc_open(struct tty_struct *tty, struct tty_ldisc *ld)
@@ -447,10 +449,9 @@ static int tty_ldisc_open(struct tty_struct *tty, struct tty_ldisc *ld)
WARN_ON(test_and_set_bit(TTY_LDISC_OPEN, &tty->flags));
if (ld->ops->open) {
int ret;
- /* BKL here locks verus a hangup event */
- lock_kernel();
+ /* BTM here locks versus a hangup event */
+ WARN_ON(!tty_locked());
ret = ld->ops->open(tty);
- unlock_kernel();
return ret;
}
return 0;
@@ -553,7 +554,7 @@ int tty_set_ldisc(struct tty_struct *tty, int ldisc)
if (IS_ERR(new_ldisc))
return PTR_ERR(new_ldisc);
- lock_kernel();
+ tty_lock();
/*
* We need to look at the tty locking here for pty/tty pairs
* when both sides try to change in parallel.
@@ -567,12 +568,12 @@ int tty_set_ldisc(struct tty_struct *tty, int ldisc)
*/
if (tty->ldisc->ops->num == ldisc) {
- unlock_kernel();
+ tty_unlock();
tty_ldisc_put(new_ldisc);
return 0;
}
- unlock_kernel();
+ tty_unlock();
/*
* Problem: What do we do if this blocks ?
* We could deadlock here
@@ -580,6 +581,7 @@ int tty_set_ldisc(struct tty_struct *tty, int ldisc)
tty_wait_until_sent(tty, 0);
+ tty_lock();
mutex_lock(&tty->ldisc_mutex);
/*
@@ -589,13 +591,13 @@ int tty_set_ldisc(struct tty_struct *tty, int ldisc)
while (test_bit(TTY_LDISC_CHANGING, &tty->flags)) {
mutex_unlock(&tty->ldisc_mutex);
+ tty_unlock();
wait_event(tty_ldisc_wait,
test_bit(TTY_LDISC_CHANGING, &tty->flags) == 0);
+ tty_lock();
mutex_lock(&tty->ldisc_mutex);
}
- lock_kernel();
-
set_bit(TTY_LDISC_CHANGING, &tty->flags);
/*
@@ -607,7 +609,7 @@ int tty_set_ldisc(struct tty_struct *tty, int ldisc)
o_ldisc = tty->ldisc;
- unlock_kernel();
+ tty_unlock();
/*
* Make sure we don't change while someone holds a
* reference to the line discipline. The TTY_LDISC bit
@@ -632,15 +634,15 @@ int tty_set_ldisc(struct tty_struct *tty, int ldisc)
flush_scheduled_work();
+ tty_lock();
mutex_lock(&tty->ldisc_mutex);
- lock_kernel();
if (test_bit(TTY_HUPPED, &tty->flags)) {
/* We were raced by the hangup method. It will have stomped
the ldisc data and closed the ldisc down */
clear_bit(TTY_LDISC_CHANGING, &tty->flags);
mutex_unlock(&tty->ldisc_mutex);
tty_ldisc_put(new_ldisc);
- unlock_kernel();
+ tty_unlock();
return -EIO;
}
@@ -682,7 +684,7 @@ int tty_set_ldisc(struct tty_struct *tty, int ldisc)
if (o_work)
schedule_delayed_work(&o_tty->buf.work, 1);
mutex_unlock(&tty->ldisc_mutex);
- unlock_kernel();
+ tty_unlock();
return retval;
}
@@ -780,7 +782,20 @@ void tty_ldisc_hangup(struct tty_struct *tty)
* Avoid racing set_ldisc or tty_ldisc_release
*/
mutex_lock(&tty->ldisc_mutex);
- tty_ldisc_halt(tty);
+
+ /*
+ * this is like tty_ldisc_halt, but we need to give up
+ * the BTM before calling cancel_delayed_work_sync,
+ * which may need to wait for another function taking the BTM
+ */
+ clear_bit(TTY_LDISC, &tty->flags);
+ tty_unlock();
+ cancel_delayed_work_sync(&tty->buf.work);
+ mutex_unlock(&tty->ldisc_mutex);
+
+ tty_lock();
+ mutex_lock(&tty->ldisc_mutex);
+
/* At this point we have a closed ldisc and we want to
reopen it. We could defer this to the next open but
it means auditing a lot of other paths so this is
@@ -851,8 +866,10 @@ void tty_ldisc_release(struct tty_struct *tty, struct tty_struct *o_tty)
* race with the set_ldisc code path.
*/
+ tty_unlock();
tty_ldisc_halt(tty);
flush_scheduled_work();
+ tty_lock();
mutex_lock(&tty->ldisc_mutex);
/*
diff --git a/drivers/char/tty_mutex.c b/drivers/char/tty_mutex.c
new file mode 100644
index 000000000000..133697540c73
--- /dev/null
+++ b/drivers/char/tty_mutex.c
@@ -0,0 +1,47 @@
+/*
+ * drivers/char/tty_lock.c
+ */
+#include <linux/tty.h>
+#include <linux/module.h>
+#include <linux/kallsyms.h>
+#include <linux/semaphore.h>
+#include <linux/sched.h>
+
+/*
+ * The 'big tty mutex'
+ *
+ * This mutex is taken and released by tty_lock() and tty_unlock(),
+ * replacing the older big kernel lock.
+ * It can no longer be taken recursively, and does not get
+ * released implicitly while sleeping.
+ *
+ * Don't use in new code.
+ */
+static DEFINE_MUTEX(big_tty_mutex);
+struct task_struct *__big_tty_mutex_owner;
+EXPORT_SYMBOL_GPL(__big_tty_mutex_owner);
+
+/*
+ * Getting the big tty mutex.
+ */
+void __lockfunc tty_lock(void)
+{
+ struct task_struct *task = current;
+
+ WARN_ON(__big_tty_mutex_owner == task);
+
+ mutex_lock(&big_tty_mutex);
+ __big_tty_mutex_owner = task;
+}
+EXPORT_SYMBOL(tty_lock);
+
+void __lockfunc tty_unlock(void)
+{
+ struct task_struct *task = current;
+
+ WARN_ON(__big_tty_mutex_owner != task);
+ __big_tty_mutex_owner = NULL;
+
+ mutex_unlock(&big_tty_mutex);
+}
+EXPORT_SYMBOL(tty_unlock);
diff --git a/drivers/char/tty_port.c b/drivers/char/tty_port.c
index a3bd1d0b66cf..33d37d230f8f 100644
--- a/drivers/char/tty_port.c
+++ b/drivers/char/tty_port.c
@@ -231,7 +231,7 @@ int tty_port_block_til_ready(struct tty_port *port,
/* block if port is in the process of being closed */
if (tty_hung_up_p(filp) || port->flags & ASYNC_CLOSING) {
- wait_event_interruptible(port->close_wait,
+ wait_event_interruptible_tty(port->close_wait,
!(port->flags & ASYNC_CLOSING));
if (port->flags & ASYNC_HUP_NOTIFY)
return -EAGAIN;
@@ -294,7 +294,9 @@ int tty_port_block_til_ready(struct tty_port *port,
retval = -ERESTARTSYS;
break;
}
+ tty_unlock();
schedule();
+ tty_lock();
}
finish_wait(&port->open_wait, &wait);
diff --git a/drivers/char/vc_screen.c b/drivers/char/vc_screen.c
index c1791a63d99d..bcce46c96b88 100644
--- a/drivers/char/vc_screen.c
+++ b/drivers/char/vc_screen.c
@@ -463,10 +463,10 @@ vcs_open(struct inode *inode, struct file *filp)
unsigned int currcons = iminor(inode) & 127;
int ret = 0;
- lock_kernel();
+ tty_lock();
if(currcons && !vc_cons_allocated(currcons-1))
ret = -ENXIO;
- unlock_kernel();
+ tty_unlock();
return ret;
}
diff --git a/drivers/char/vt.c b/drivers/char/vt.c
index 44f03ddd8871..c734f9b1263a 100644
--- a/drivers/char/vt.c
+++ b/drivers/char/vt.c
@@ -105,6 +105,7 @@
#include <asm/system.h>
#include <linux/uaccess.h>
#include <linux/kdb.h>
+#include <linux/ctype.h>
#define MAX_NR_CON_DRIVER 16
@@ -286,8 +287,12 @@ static inline unsigned short *screenpos(struct vc_data *vc, int offset, int view
return p;
}
+/* Called from the keyboard irq path.. */
static inline void scrolldelta(int lines)
{
+ /* FIXME */
+ /* scrolldelta needs some kind of consistency lock, but the BKL was
+ and still is not protecting versus the scheduled back end */
scrollback_delta += lines;
schedule_console_callback();
}
@@ -704,7 +709,10 @@ void redraw_screen(struct vc_data *vc, int is_switch)
update_attr(vc);
clear_buffer_attributes(vc);
}
- if (update && vc->vc_mode != KD_GRAPHICS)
+
+ /* Forcibly update if we're panicing */
+ if ((update && vc->vc_mode != KD_GRAPHICS) ||
+ vt_force_oops_output(vc))
do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
}
set_cursor(vc);
@@ -742,6 +750,7 @@ static void visual_init(struct vc_data *vc, int num, int init)
vc->vc_hi_font_mask = 0;
vc->vc_complement_mask = 0;
vc->vc_can_do_color = 0;
+ vc->vc_panic_force_write = false;
vc->vc_sw->con_init(vc, init);
if (!vc->vc_complement_mask)
vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
@@ -774,6 +783,7 @@ int vc_allocate(unsigned int currcons) /* return 0 on success */
if (!vc)
return -ENOMEM;
vc_cons[currcons].d = vc;
+ tty_port_init(&vc->port);
INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
visual_init(vc, currcons, 1);
if (!*vc->vc_uni_pagedir_loc)
@@ -963,12 +973,12 @@ static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
* Resize a virtual console as seen from the console end of things. We
* use the common vc_do_resize methods to update the structures. The
* caller must hold the console sem to protect console internals and
- * vc->vc_tty
+ * vc->port.tty
*/
int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
{
- return vc_do_resize(vc->vc_tty, vc, cols, rows);
+ return vc_do_resize(vc->port.tty, vc, cols, rows);
}
/**
@@ -1796,8 +1806,8 @@ static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
vc->vc_state = ESnormal;
return;
case ESpalette:
- if ( (c>='0'&&c<='9') || (c>='A'&&c<='F') || (c>='a'&&c<='f') ) {
- vc->vc_par[vc->vc_npar++] = (c > '9' ? (c & 0xDF) - 'A' + 10 : c - '0');
+ if (isxdigit(c)) {
+ vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
if (vc->vc_npar == 7) {
int i = vc->vc_par[0] * 3, j = 1;
vc->vc_palette[i] = 16 * vc->vc_par[j++];
@@ -2505,7 +2515,7 @@ static void vt_console_print(struct console *co, const char *b, unsigned count)
goto quit;
}
- if (vc->vc_mode != KD_TEXT)
+ if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
goto quit;
/* undraw cursor first */
@@ -2611,8 +2621,6 @@ int tioclinux(struct tty_struct *tty, unsigned long arg)
return -EFAULT;
ret = 0;
- lock_kernel();
-
switch (type)
{
case TIOCL_SETSEL:
@@ -2687,7 +2695,6 @@ int tioclinux(struct tty_struct *tty, unsigned long arg)
ret = -EINVAL;
break;
}
- unlock_kernel();
return ret;
}
@@ -2800,12 +2807,12 @@ static int con_open(struct tty_struct *tty, struct file *filp)
struct vc_data *vc = vc_cons[currcons].d;
/* Still being freed */
- if (vc->vc_tty) {
+ if (vc->port.tty) {
release_console_sem();
return -ERESTARTSYS;
}
tty->driver_data = vc;
- vc->vc_tty = tty;
+ vc->port.tty = tty;
if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
@@ -2833,7 +2840,7 @@ static void con_shutdown(struct tty_struct *tty)
struct vc_data *vc = tty->driver_data;
BUG_ON(vc == NULL);
acquire_console_sem();
- vc->vc_tty = NULL;
+ vc->port.tty = NULL;
release_console_sem();
tty_shutdown(tty);
}
@@ -2915,6 +2922,7 @@ static int __init con_init(void)
for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
+ tty_port_init(&vc->port);
visual_init(vc, currcons, 1);
vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
vc_init(vc, vc->vc_rows, vc->vc_cols,
@@ -3783,7 +3791,8 @@ void do_unblank_screen(int leaving_gfx)
return;
}
vc = vc_cons[fg_console].d;
- if (vc->vc_mode != KD_TEXT)
+ /* Try to unblank in oops case too */
+ if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
return; /* but leave console_blanked != 0 */
if (blankinterval) {
@@ -3792,7 +3801,7 @@ void do_unblank_screen(int leaving_gfx)
}
console_blanked = 0;
- if (vc->vc_sw->con_blank(vc, 0, leaving_gfx))
+ if (vc->vc_sw->con_blank(vc, 0, leaving_gfx) || vt_force_oops_output(vc))
/* Low-level driver cannot restore -> do it ourselves */
update_screen(vc);
if (console_blank_hook)
diff --git a/drivers/char/vt_ioctl.c b/drivers/char/vt_ioctl.c
index cb19dbc52136..2bbeaaea46e9 100644
--- a/drivers/char/vt_ioctl.c
+++ b/drivers/char/vt_ioctl.c
@@ -133,7 +133,7 @@ static void vt_event_wait(struct vt_event_wait *vw)
list_add(&vw->list, &vt_events);
spin_unlock_irqrestore(&vt_event_lock, flags);
/* Wait for it to pass */
- wait_event_interruptible(vt_event_waitqueue, vw->done);
+ wait_event_interruptible_tty(vt_event_waitqueue, vw->done);
/* Dequeue it */
spin_lock_irqsave(&vt_event_lock, flags);
list_del(&vw->list);
@@ -509,7 +509,7 @@ int vt_ioctl(struct tty_struct *tty, struct file * file,
console = vc->vc_num;
- lock_kernel();
+ tty_lock();
if (!vc_cons_allocated(console)) { /* impossible? */
ret = -ENOIOCTLCMD;
@@ -1336,7 +1336,7 @@ int vt_ioctl(struct tty_struct *tty, struct file * file,
ret = -ENOIOCTLCMD;
}
out:
- unlock_kernel();
+ tty_unlock();
return ret;
eperm:
ret = -EPERM;
@@ -1369,7 +1369,7 @@ void vc_SAK(struct work_struct *work)
acquire_console_sem();
vc = vc_con->d;
if (vc) {
- tty = vc->vc_tty;
+ tty = vc->port.tty;
/*
* SAK should also work in all raw modes and reset
* them properly.
@@ -1503,7 +1503,7 @@ long vt_compat_ioctl(struct tty_struct *tty, struct file * file,
console = vc->vc_num;
- lock_kernel();
+ tty_lock();
if (!vc_cons_allocated(console)) { /* impossible? */
ret = -ENOIOCTLCMD;
@@ -1571,11 +1571,11 @@ long vt_compat_ioctl(struct tty_struct *tty, struct file * file,
goto fallback;
}
out:
- unlock_kernel();
+ tty_unlock();
return ret;
fallback:
- unlock_kernel();
+ tty_unlock();
return vt_ioctl(tty, file, cmd, arg);
}
@@ -1761,10 +1761,13 @@ int vt_move_to_console(unsigned int vt, int alloc)
return -EIO;
}
release_console_sem();
+ tty_lock();
if (vt_waitactive(vt + 1)) {
pr_debug("Suspend: Can't switch VCs.");
+ tty_unlock();
return -EINTR;
}
+ tty_unlock();
return prev;
}