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, 0 deletions

diff --git a/drivers/media/video/pvrusb2/pvrusb2-v4l2.c b/drivers/media/video/pvrusb2/pvrusb2-v4l2.c
index 00306fa..26ffaa2 100644
--- a/drivers/media/video/pvrusb2/pvrusb2-v4l2.c
+++ b/drivers/media/video/pvrusb2/pvrusb2-v4l2.c
@@ -932,6 +932,7 @@ static int pvr2_v4l2_open(struct inode *inode, struct file *file)
 	unsigned int input_cnt,idx;
 	int ret = 0;
 
+	lock_kernel();
 	dip = container_of(video_devdata(file),struct pvr2_v4l2_dev,devbase);
 
 	vp = dip->v4lp;
@@ -942,11 +943,13 @@ static int pvr2_v4l2_open(struct inode *inode, struct file *file)
 	if (!pvr2_hdw_dev_ok(hdw)) {
 		pvr2_trace(PVR2_TRACE_OPEN_CLOSE,
 			   "pvr2_v4l2_open: hardware not ready");
+		unlock_kernel();
 		return -EIO;
 	}
 
 	fhp = kzalloc(sizeof(*fhp),GFP_KERNEL);
 	if (!fhp) {
+		unlock_kernel();
 		return -ENOMEM;
 	}
 
@@ -976,6 +979,7 @@ static int pvr2_v4l2_open(struct inode *inode, struct file *file)
 			   fhp);
 
 		kfree(fhp);
+		unlock_kernel();
 		return ret;
 	}
 
@@ -992,6 +996,7 @@ static int pvr2_v4l2_open(struct inode *inode, struct file *file)
 			   "Destroying pvr_v4l2_fh id=%p (input map failure)",
 			   fhp);
 		kfree(fhp);
+		unlock_kernel();
 		return -ENOMEM;
 	}
 	input_cnt = 0;
@@ -1015,6 +1020,7 @@ static int pvr2_v4l2_open(struct inode *inode, struct file *file)
 	v4l2_prio_open(&vp->prio,&fhp->prio);
 
 	fhp->fw_mode_flag = pvr2_hdw_cpufw_get_enabled(hdw);
+	unlock_kernel();
 
 	return 0;
 }