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/se401.c b/drivers/media/video/se401.c
index acceed5d04ae..d16bbf0d2783 100644
--- a/drivers/media/video/se401.c
+++ b/drivers/media/video/se401.c
@@ -936,14 +936,18 @@ static int se401_open(struct inode *inode, struct file *file)
         struct usb_se401 *se401 = (struct usb_se401 *)dev;
         int err = 0;
 
-        if (se401->user)
+        lock_kernel();
+        if (se401->user) {
+                unlock_kernel();
                 return -EBUSY;
+        }
         se401->fbuf = rvmalloc(se401->maxframesize * SE401_NUMFRAMES);
         if (se401->fbuf)
                 file->private_data = dev;
         else
                 err = -ENOMEM;
         se401->user = !err;
+        unlock_kernel();
 
         return err;
 }