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, 6 insertions, 1 deletions

diff --git a/drivers/media/video/vivi.c b/drivers/media/video/vivi.c
index 8ba8daafd7ea..65c8af18e767 100644
--- a/drivers/media/video/vivi.c
+++ b/drivers/media/video/vivi.c
@@ -898,9 +898,11 @@ static int vivi_open(struct inode *inode, struct file *file)
 
         printk(KERN_DEBUG "vivi: open called (minor=%d)\n", minor);
 
+        lock_kernel();
         list_for_each_entry(dev, &vivi_devlist, vivi_devlist)
                 if (dev->vfd->minor == minor)
                         goto found;
+        unlock_kernel();
         return -ENODEV;
 
 found:
@@ -925,8 +927,10 @@ found:
         }
 unlock:
         mutex_unlock(&dev->mutex);
-        if (retval)
+        if (retval) {
+                unlock_kernel();
                 return retval;
+        }
 
         file->private_data = fh;
         fh->dev      = dev;
@@ -955,6 +959,7 @@ unlock:
                         sizeof(struct vivi_buffer), fh);
 
         vivi_start_thread(fh);
+        unlock_kernel();
 
         return 0;
 }