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, 7 insertions, 1 deletions

diff --git a/drivers/media/video/saa5246a.c b/drivers/media/video/saa5246a.c
index 6ee63e69b36c..e2c538ee88f2 100644
--- a/drivers/media/video/saa5246a.c
+++ b/drivers/media/video/saa5246a.c
@@ -44,6 +44,7 @@
 #include <linux/init.h>
 #include <linux/i2c.h>
 #include <linux/videotext.h>
+#include <linux/smp_lock.h>
 #include <linux/videodev.h>
 #include <media/v4l2-common.h>
 #include <media/v4l2-ioctl.h>
@@ -737,9 +738,12 @@ static int saa5246a_open(struct inode *inode, struct file *file)
         struct saa5246a_device *t = vd->priv;
         int err;
 
+        lock_kernel();
         err = video_exclusive_open(inode,file);
-        if (err < 0)
+        if (err < 0) {
+                unlock_kernel();
                 return err;
+        }
 
         if (t->client==NULL) {
                 err = -ENODEV;
@@ -776,11 +780,13 @@ static int saa5246a_open(struct inode *inode, struct file *file)
                 err = -EIO;
                 goto fail;
         }
+        unlock_kernel();
 
         return 0;
 
 fail:
         video_exclusive_release(inode,file);
+        unlock_kernel();
         return err;
 }