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| author | Stefan Richter <stefanr@s5r6.in-berlin.de> | 2006-10-20 21:01:58 +0200 |
|---|---|---|
| committer | Stefan Richter <stefanr@s5r6.in-berlin.de> | 2006-12-07 21:31:38 +0100 |
| commit | 7b900c12cd689e4372afe3904a03f98253546449 (patch) | |
| tree | df2d71bb71627059e065451bf2c7af734ecd15a3 | |
| parent | 75dcf5dc5a0dc4e895944368780cc2fc40008a55 (diff) | |
| download | linux-3.10-7b900c12cd689e4372afe3904a03f98253546449.tar.gz linux-3.10-7b900c12cd689e4372afe3904a03f98253546449.tar.bz2 linux-3.10-7b900c12cd689e4372afe3904a03f98253546449.zip | |
dv1394: remove BKL contention
Purges the one remaining call to lock_kernel() from the 1394 subsystem.
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
| -rw-r--r-- | drivers/ieee1394/dv1394.c | 14 |
1 files changed, 3 insertions, 11 deletions
diff --git a/drivers/ieee1394/dv1394.c b/drivers/ieee1394/dv1394.c index 6c72f04b2b5..d0e11c176c3 100644 --- a/drivers/ieee1394/dv1394.c +++ b/drivers/ieee1394/dv1394.c @@ -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; } |