[PATCH 1/8] vb2: set owner before calling vb2_read

[Hans Verkuil <hverkuil-cisco@xs4all.nl>]

From: Hans Verkuil <hans.verkuil@cisco.com>

Before vb2_read is called, the owner must be set since vb2_read will actually
start streaming. If vb2_read returns an error and q->fileio is NULL, then
it failed to start streaming and the owner is set back to NULL.

When the vb2 start_streaming callback is called, it expects the owner
pointer to be set, and that wasn't the case in this particular situation.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
---
 drivers/media/common/videobuf2/videobuf2-v4l2.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/media/common/videobuf2/videobuf2-v4l2.c b/drivers/media/common/videobuf2/videobuf2-v4l2.c
index 1f5d235a8441..c7a54d82a55e 100644
--- a/drivers/media/common/videobuf2/videobuf2-v4l2.c
+++ b/drivers/media/common/videobuf2/videobuf2-v4l2.c
@@ -1171,10 +1171,11 @@ ssize_t vb2_fop_read(struct file *file, char __user *buf,
 		return -ERESTARTSYS;
 	if (vb2_queue_is_busy(vdev->queue, file))
 		goto exit;
+	vdev->queue->owner = file->private_data;
 	err = vb2_read(vdev->queue, buf, count, ppos,
 		       file->f_flags & O_NONBLOCK);
-	if (vdev->queue->fileio)
-		vdev->queue->owner = file->private_data;
+	if (!vdev->queue->fileio)
+		vdev->queue->owner = NULL;
 exit:
 	if (lock)
 		mutex_unlock(lock);
-- 
2.39.0