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-rw-r--r--drivers/scsi/sg.c79
1 files changed, 41 insertions, 38 deletions
diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c
index df5e961484e1..4efa9b5884b7 100644
--- a/drivers/scsi/sg.c
+++ b/drivers/scsi/sg.c
@@ -170,11 +170,11 @@ typedef struct sg_fd { /* holds the state of a file descriptor */
typedef struct sg_device { /* holds the state of each scsi generic device */
struct scsi_device *device;
- wait_queue_head_t o_excl_wait; /* queue open() when O_EXCL in use */
int sg_tablesize; /* adapter's max scatter-gather table size */
u32 index; /* device index number */
/* sfds is protected by sg_index_lock */
struct list_head sfds;
+ struct rw_semaphore o_sem; /* exclude open should hold this rwsem */
volatile char detached; /* 0->attached, 1->detached pending removal */
/* exclude protected by sg_open_exclusive_lock */
char exclude; /* opened for exclusive access */
@@ -265,7 +265,6 @@ sg_open(struct inode *inode, struct file *filp)
struct request_queue *q;
Sg_device *sdp;
Sg_fd *sfp;
- int res;
int retval;
nonseekable_open(inode, filp);
@@ -294,35 +293,35 @@ sg_open(struct inode *inode, struct file *filp)
goto error_out;
}
- if (flags & O_EXCL) {
- if (O_RDONLY == (flags & O_ACCMODE)) {
- retval = -EPERM; /* Can't lock it with read only access */
- goto error_out;
- }
- if (!sfds_list_empty(sdp) && (flags & O_NONBLOCK)) {
- retval = -EBUSY;
- goto error_out;
- }
- res = wait_event_interruptible(sdp->o_excl_wait,
- ((!sfds_list_empty(sdp) || get_exclude(sdp)) ? 0 : set_exclude(sdp, 1)));
- if (res) {
- retval = res; /* -ERESTARTSYS because signal hit process */
- goto error_out;
- }
- } else if (get_exclude(sdp)) { /* some other fd has an exclusive lock on dev */
- if (flags & O_NONBLOCK) {
- retval = -EBUSY;
- goto error_out;
- }
- res = wait_event_interruptible(sdp->o_excl_wait, !get_exclude(sdp));
- if (res) {
- retval = res; /* -ERESTARTSYS because signal hit process */
- goto error_out;
+ if ((flags & O_EXCL) && (O_RDONLY == (flags & O_ACCMODE))) {
+ retval = -EPERM; /* Can't lock it with read only access */
+ goto error_out;
+ }
+ if (flags & O_NONBLOCK) {
+ if (flags & O_EXCL) {
+ if (!down_write_trylock(&sdp->o_sem)) {
+ retval = -EBUSY;
+ goto error_out;
+ }
+ } else {
+ if (!down_read_trylock(&sdp->o_sem)) {
+ retval = -EBUSY;
+ goto error_out;
+ }
}
+ } else {
+ if (flags & O_EXCL)
+ down_write(&sdp->o_sem);
+ else
+ down_read(&sdp->o_sem);
}
+ /* Since write lock is held, no need to check sfd_list */
+ if (flags & O_EXCL)
+ set_exclude(sdp, 1);
+
if (sdp->detached) {
retval = -ENODEV;
- goto error_out;
+ goto sem_out;
}
if (sfds_list_empty(sdp)) { /* no existing opens on this device */
sdp->sgdebug = 0;
@@ -331,17 +330,18 @@ sg_open(struct inode *inode, struct file *filp)
}
if ((sfp = sg_add_sfp(sdp, dev)))
filp->private_data = sfp;
+ /* retval is already provably zero at this point because of the
+ * check after retval = scsi_autopm_get_device(sdp->device))
+ */
else {
+ retval = -ENOMEM;
+sem_out:
if (flags & O_EXCL) {
set_exclude(sdp, 0); /* undo if error */
- wake_up_interruptible(&sdp->o_excl_wait);
- }
- retval = -ENOMEM;
- goto error_out;
- }
- retval = 0;
+ up_write(&sdp->o_sem);
+ } else
+ up_read(&sdp->o_sem);
error_out:
- if (retval) {
scsi_autopm_put_device(sdp->device);
sdp_put:
scsi_device_put(sdp->device);
@@ -358,13 +358,18 @@ sg_release(struct inode *inode, struct file *filp)
{
Sg_device *sdp;
Sg_fd *sfp;
+ int excl;
if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
return -ENXIO;
SCSI_LOG_TIMEOUT(3, printk("sg_release: %s\n", sdp->disk->disk_name));
+ excl = get_exclude(sdp);
set_exclude(sdp, 0);
- wake_up_interruptible(&sdp->o_excl_wait);
+ if (excl)
+ up_write(&sdp->o_sem);
+ else
+ up_read(&sdp->o_sem);
scsi_autopm_put_device(sdp->device);
kref_put(&sfp->f_ref, sg_remove_sfp);
@@ -1416,7 +1421,7 @@ static Sg_device *sg_alloc(struct gendisk *disk, struct scsi_device *scsidp)
sdp->disk = disk;
sdp->device = scsidp;
INIT_LIST_HEAD(&sdp->sfds);
- init_waitqueue_head(&sdp->o_excl_wait);
+ init_rwsem(&sdp->o_sem);
sdp->sg_tablesize = queue_max_segments(q);
sdp->index = k;
kref_init(&sdp->d_ref);
@@ -2127,13 +2132,11 @@ static void sg_remove_sfp_usercontext(struct work_struct *work)
static void sg_remove_sfp(struct kref *kref)
{
struct sg_fd *sfp = container_of(kref, struct sg_fd, f_ref);
- struct sg_device *sdp = sfp->parentdp;
unsigned long iflags;
write_lock_irqsave(&sg_index_lock, iflags);
list_del(&sfp->sfd_siblings);
write_unlock_irqrestore(&sg_index_lock, iflags);
- wake_up_interruptible(&sdp->o_excl_wait);
INIT_WORK(&sfp->ew.work, sg_remove_sfp_usercontext);
schedule_work(&sfp->ew.work);