media: videobuf2-core: dequeue if start_streaming fails
If a vb2_queue sets q->min_buffers_needed then when the number of queued buffers reaches q->min_buffers_needed, vb2_core_qbuf() will call the start_streaming() callback. If start_streaming() returns an error, then that error was just returned by vb2_core_qbuf(), but the buffer was still queued. However, userspace expects that if VIDIOC_QBUF fails, the buffer is returned dequeued. So if start_streaming() fails, then remove the buffer from the queue, thus avoiding this unwanted side-effect. Signed-off-by:Hans Verkuil <hverkuil-cisco@xs4all.nl> Reviewed-by:
Laurent Pinchart <laurent.pinchart@ideasonboard.com> Tested-by:
Kieran Bingham <kieran.bingham@ideasonboard.com> Fixes: b3379c62 ("[media] vb2: only call start_streaming if sufficient buffers are queued") Signed-off-by:
Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
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76f22c93