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, 6 insertions, 1 deletions

diff --git a/linux/drivers/media/video/meye.c b/linux/drivers/media/video/meye.c
index d128a611e..a0cdae0c1 100644
--- a/linux/drivers/media/video/meye.c
+++ b/linux/drivers/media/video/meye.c
@@ -850,15 +850,19 @@ static int meye_open(struct inode *inode, struct file *file)
 {
 	int i, err;
 
+	lock_kernel();
 	err = video_exclusive_open(inode, file);
-	if (err < 0)
+	if (err < 0) {
+		unlock_kernel();
 		return err;
+	}
 
 	mchip_hic_stop();
 
 	if (mchip_dma_alloc()) {
 		printk(KERN_ERR "meye: mchip framebuffer allocation failed\n");
 		video_exclusive_release(inode, file);
+		unlock_kernel();
 		return -ENOBUFS;
 	}
 
@@ -866,6 +870,7 @@ static int meye_open(struct inode *inode, struct file *file)
 		meye.grab_buffer[i].state = MEYE_BUF_UNUSED;
 	kfifo_reset(meye.grabq);
 	kfifo_reset(meye.doneq);
+	unlock_kernel();
 	return 0;
 }