From: Hans Verkuil <hans.verkuil@xxxxxxxxx> Check if the vb2 queue uses requests, and if so refuse to add buffers that are not part of a request. Also check for the reverse: a vb2 queue did not use requests, and an attempt was made to queue a buffer to a request. We might relax this in the future, but for now just return -EPERM in that case. Signed-off-by: Hans Verkuil <hans.verkuil@xxxxxxxxx> --- drivers/media/common/videobuf2/videobuf2-v4l2.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/drivers/media/common/videobuf2/videobuf2-v4l2.c b/drivers/media/common/videobuf2/videobuf2-v4l2.c index 0b07c349eb20..ee537831f756 100644 --- a/drivers/media/common/videobuf2/videobuf2-v4l2.c +++ b/drivers/media/common/videobuf2/videobuf2-v4l2.c @@ -378,8 +378,16 @@ static int vb2_queue_or_prepare_buf(struct vb2_queue *q, struct media_device *md return ret; } - if (!(b->flags & V4L2_BUF_FLAG_REQUEST_FD)) + if (!(b->flags & V4L2_BUF_FLAG_REQUEST_FD)) { + if (q->uses_requests) { + dprintk(1, "%s: queue uses requests\n", opname); + return -EPERM; + } return 0; + } else if (q->uses_qbuf) { + dprintk(1, "%s: queue does not use requests\n", opname); + return -EPERM; + } /* * For proper locking when queueing a request you need to be able -- 2.18.0