From 7b900c12cd689e4372afe3904a03f98253546449 Mon Sep 17 00:00:00 2001 From: Stefan Richter Date: Fri, 20 Oct 2006 21:01:58 +0200 Subject: [PATCH] dv1394: remove BKL contention Purges the one remaining call to lock_kernel() from the 1394 subsystem. Signed-off-by: Stefan Richter --- drivers/ieee1394/dv1394.c | 14 +++----------- 1 file changed, 3 insertions(+), 11 deletions(-) diff --git a/drivers/ieee1394/dv1394.c b/drivers/ieee1394/dv1394.c index 6c72f04b2b5d..d0e11c176c3b 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; } -- 2.20.1