v4l: move BKL down to the driver level.

From: Hans Verkuil <hverkuil@xs4all.nl>

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>

1 files changed, 2 insertions, 0 deletions

diff --git a/linux/drivers/media/radio/radio-si470x.c b/linux/drivers/media/radio/radio-si470x.c
index afff1345b..3b1f630a9 100644
--- a/linux/drivers/media/radio/radio-si470x.c
+++ b/linux/drivers/media/radio/radio-si470x.c
@@ -1079,6 +1079,7 @@ static int si470x_fops_open(struct inode *inode, struct file *file)
 	struct si470x_device *radio = video_get_drvdata(video_devdata(file));
 	int retval;
 
+	lock_kernel();
 	radio->users++;
 
 	retval = usb_autopm_get_interface(radio->intf);
@@ -1095,6 +1096,7 @@ static int si470x_fops_open(struct inode *inode, struct file *file)
 	}
 
 done:
+	unlock_kernel();
 	return retval;
 }