media: vb2: check that buf_out_validate is present

The buf_out_validate is required for output queues in combination
with requests. Check this.

Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

diff --git a/drivers/media/common/videobuf2/videobuf2-v4l2.c b/drivers/media/common/videobuf2/videobuf2-v4l2.c
index 2f3b3ca..3aeaea3 100644 (file)
--- a/drivers/media/common/videobuf2/videobuf2-v4l2.c
+++ b/drivers/media/common/videobuf2/videobuf2-v4l2.c
@@ -409,6 +409,15 @@ static int vb2_queue_or_prepare_buf(struct vb2_queue *q, struct media_device *md
         */
        if (WARN_ON(!q->ops->buf_request_complete))
                return -EINVAL;
+       /*
+        * Make sure this op is implemented by the driver for the output queue.
+        * It's easy to forget this callback, but is it important to correctly
+        * validate the 'field' value at QBUF time.
+        */
+       if (WARN_ON((q->type == V4L2_BUF_TYPE_VIDEO_OUTPUT ||
+                    q->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE) &&
+                   !q->ops->buf_out_validate))
+               return -EINVAL;
 
        if (vb->state != VB2_BUF_STATE_DEQUEUED) {
                dprintk(1, "%s: buffer is not in dequeued state\n", opname);