V4L/DVB (8613): v4l: move BKL down to the driver level.

The BKL is now moved from the video_open function in v4l2-dev.c to the
various drivers. It seems about a third of the drivers already has a
lock of some sort protecting the open(), another third uses
video_exclusive_open (yuck!) and the last third required adding the
BKL in their open function.

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 5 insertions, 1 deletions

diff --git a/drivers/media/video/cafe_ccic.c b/drivers/media/video/cafe_ccic.c
index 5405c30dbb0..e9994c81df6 100644
--- a/drivers/media/video/cafe_ccic.c
+++ b/drivers/media/video/cafe_ccic.c
@@ -1476,9 +1476,12 @@ static int cafe_v4l_open(struct inode *inode, struct file *filp)
 {
         struct cafe_camera *cam;
 
+        lock_kernel();
         cam = cafe_find_dev(iminor(inode));
-        if (cam == NULL)
+        if (cam == NULL) {
+                unlock_kernel();
                 return -ENODEV;
+        }
         filp->private_data = cam;
 
         mutex_lock(&cam->s_mutex);
@@ -1490,6 +1493,7 @@ static int cafe_v4l_open(struct inode *inode, struct file *filp)
         }
         (cam->users)++;
         mutex_unlock(&cam->s_mutex);
+        unlock_kernel();
         return 0;
 }