From 9ac8090fda77f072815c209c80fb230e89cda18c Mon Sep 17 00:00:00 2001 From: Hans Verkuil Date: Wed, 23 May 2018 08:09:23 -0400 Subject: [PATCH] media: videobuf2-v4l2: refuse qbuf if queue uses requests or vv. 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 Reviewed-by: Mauro Carvalho Chehab Signed-off-by: Mauro Carvalho Chehab --- 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 364b1fe..a70df16 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 -- 2.7.4