AcoSail/kernel_optimize_test
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dv1394: remove BKL contention

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Purges the one remaining call to lock_kernel() from the 1394 subsystem.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
This commit is contained in:
Stefan Richter 2006-10-20 21:01:58 +02:00
parent 75dcf5dc5a
commit 7b900c12cd
1 changed files with 3 additions and 11 deletions
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14
drivers/ieee1394/dv1394.c
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@ -1536,27 +1536,20 @@ static ssize_t dv1394_read(struct file *file, char __user *buffer, size_t count
static long dv1394_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
struct video_card *video;
struct video_card *video = file_to_video_card(file);
unsigned long flags;
int ret = -EINVAL;
void __user *argp = (void __user *)arg;
DECLARE_WAITQUEUE(wait, current);
lock_kernel();
video = file_to_video_card(file);
/* serialize this to prevent multi-threaded mayhem */
if (file->f_flags & O_NONBLOCK) {
if (!mutex_trylock(&video->mtx)) {
unlock_kernel();
if (!mutex_trylock(&video->mtx))
return -EAGAIN;
}
} else {
if (mutex_lock_interruptible(&video->mtx)) {
unlock_kernel();
if (mutex_lock_interruptible(&video->mtx))
return -ERESTARTSYS;
}
}
switch(cmd)
@ -1780,7 +1773,6 @@ static long dv1394_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
out:
mutex_unlock(&video->mtx);
unlock_kernel();
return ret;
}