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Subject: media: vb2: don't call __vb2_queue_cancel if vb2_start_streaming failed Author: Hans Verkuil hverkuil-cisco@xs4all.nl Date: Wed Nov 28 03:37:43 2018 -0500

vb2_start_streaming() already rolls back the buffers, so there is no need to call __vb2_queue_cancel(). Especially since __vb2_queue_cancel() does too much, such as zeroing the q->queued_count value, causing vb2 to think that no buffers have been queued.

It appears that this call to __vb2_queue_cancel() is a left-over from before commit b3379c6201bb3.

Fixes: b3379c6201bb3 ('vb2: only call start_streaming if sufficient buffers are queued')

Signed-off-by: Hans Verkuil hverkuil-cisco@xs4all.nl Cc: stable@vger.kernel.org # for v4.16 and up Acked-by: Sakari Ailus sakari.ailus@linux.intel.com Signed-off-by: Mauro Carvalho Chehab mchehab+samsung@kernel.org

drivers/media/common/videobuf2/videobuf2-core.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-)

---

diff --git a/drivers/media/common/videobuf2/videobuf2-core.c b/drivers/media/common/videobuf2/videobuf2-core.c index 975ff5669f72..e006698807fa 100644 --- a/drivers/media/common/videobuf2/videobuf2-core.c +++ b/drivers/media/common/videobuf2/videobuf2-core.c @@ -1940,10 +1940,8 @@ int vb2_core_streamon(struct vb2_queue *q, unsigned int type) if (ret) return ret; ret = vb2_start_streaming(q); - if (ret) { - __vb2_queue_cancel(q); + if (ret) return ret; - } }

q->streaming = 1;