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authorRafael J. Wysocki <rjw@sisk.pl>2007-10-18 03:04:45 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-18 14:37:19 -0700
commite42837bcd35b75bb59ae5d3e62f87be1aeeb05c3 (patch)
treeaa9666b080dc75ef3fa27992f042a422f7a979b7 /drivers
parent2e1318956ce6bf149af5c5e98499b5cd99f99c89 (diff)
freezer: introduce freezer-friendly waiting macros
Introduce freezer-friendly wrappers around wait_event_interruptible() and wait_event_interruptible_timeout(), originally defined in <linux/wait.h>, to be used in freezable kernel threads. Make some of the freezable kernel threads use them. This is necessary for the freezer to stop sending signals to kernel threads, which is implemented in the next patch. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Acked-by: Pavel Machek <pavel@ucw.cz> Cc: Nigel Cunningham <nigel@nigel.suspend2.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/input/gameport/gameport.c3
-rw-r--r--drivers/input/serio/serio.c3
-rw-r--r--drivers/input/touchscreen/ucb1400_ts.c3
-rw-r--r--drivers/media/dvb/dvb-core/dvb_frontend.c3
-rw-r--r--drivers/usb/core/hub.c3
-rw-r--r--drivers/usb/storage/usb.c5
6 files changed, 7 insertions, 13 deletions
diff --git a/drivers/input/gameport/gameport.c b/drivers/input/gameport/gameport.c
index 20896d5e5f0e..ec1b6cfefcd3 100644
--- a/drivers/input/gameport/gameport.c
+++ b/drivers/input/gameport/gameport.c
@@ -448,9 +448,8 @@ static int gameport_thread(void *nothing)
set_freezable();
do {
gameport_handle_event();
- wait_event_interruptible(gameport_wait,
+ wait_event_freezable(gameport_wait,
kthread_should_stop() || !list_empty(&gameport_event_list));
- try_to_freeze();
} while (!kthread_should_stop());
printk(KERN_DEBUG "gameport: kgameportd exiting\n");
diff --git a/drivers/input/serio/serio.c b/drivers/input/serio/serio.c
index b3bc15acd3f5..7f5293828fbf 100644
--- a/drivers/input/serio/serio.c
+++ b/drivers/input/serio/serio.c
@@ -387,9 +387,8 @@ static int serio_thread(void *nothing)
set_freezable();
do {
serio_handle_event();
- wait_event_interruptible(serio_wait,
+ wait_event_freezable(serio_wait,
kthread_should_stop() || !list_empty(&serio_event_list));
- try_to_freeze();
} while (!kthread_should_stop());
printk(KERN_DEBUG "serio: kseriod exiting\n");
diff --git a/drivers/input/touchscreen/ucb1400_ts.c b/drivers/input/touchscreen/ucb1400_ts.c
index 86aed64ec0fb..89373b01d8f5 100644
--- a/drivers/input/touchscreen/ucb1400_ts.c
+++ b/drivers/input/touchscreen/ucb1400_ts.c
@@ -333,10 +333,9 @@ static int ucb1400_ts_thread(void *_ucb)
timeout = msecs_to_jiffies(10);
}
- wait_event_interruptible_timeout(ucb->ts_wait,
+ wait_event_freezable_timeout(ucb->ts_wait,
ucb->irq_pending || ucb->ts_restart || kthread_should_stop(),
timeout);
- try_to_freeze();
}
/* Send the "pen off" if we are stopping with the pen still active */
diff --git a/drivers/media/dvb/dvb-core/dvb_frontend.c b/drivers/media/dvb/dvb-core/dvb_frontend.c
index b203640ef1c5..445f02665577 100644
--- a/drivers/media/dvb/dvb-core/dvb_frontend.c
+++ b/drivers/media/dvb/dvb-core/dvb_frontend.c
@@ -527,7 +527,8 @@ static int dvb_frontend_thread(void *data)
up(&fepriv->sem); /* is locked when we enter the thread... */
restart:
timeout = wait_event_interruptible_timeout(fepriv->wait_queue,
- dvb_frontend_should_wakeup(fe) || kthread_should_stop(),
+ dvb_frontend_should_wakeup(fe) || kthread_should_stop()
+ || freezing(current),
fepriv->delay);
if (kthread_should_stop() || dvb_frontend_is_exiting(fe)) {
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index 60a8f55a0cc7..036c3dea855e 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -2870,10 +2870,9 @@ static int hub_thread(void *__unused)
set_freezable();
do {
hub_events();
- wait_event_interruptible(khubd_wait,
+ wait_event_freezable(khubd_wait,
!list_empty(&hub_event_list) ||
kthread_should_stop());
- try_to_freeze();
} while (!kthread_should_stop() || !list_empty(&hub_event_list));
pr_debug("%s: khubd exiting\n", usbcore_name);
diff --git a/drivers/usb/storage/usb.c b/drivers/usb/storage/usb.c
index 3451e8d03ab0..ac6114eea0c3 100644
--- a/drivers/usb/storage/usb.c
+++ b/drivers/usb/storage/usb.c
@@ -907,12 +907,9 @@ static int usb_stor_scan_thread(void * __us)
if (delay_use > 0) {
printk(KERN_DEBUG "usb-storage: waiting for device "
"to settle before scanning\n");
-retry:
- wait_event_interruptible_timeout(us->delay_wait,
+ wait_event_freezable_timeout(us->delay_wait,
test_bit(US_FLIDX_DISCONNECTING, &us->flags),
delay_use * HZ);
- if (try_to_freeze())
- goto retry;
}
/* If the device is still connected, perform the scanning */