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media: vb2: don't call __vb2_queue_cancel if vb2_start_streaming failed

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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 b3379c6201.

Fixes: b3379c6201 ('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>
This commit is contained in:
Hans Verkuil 2018-11-28 03:37:43 -05:00 committed by Mauro Carvalho Chehab
parent 53e9d83827
commit 04990215de
1 changed files with 1 additions and 3 deletions
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4
drivers/media/common/videobuf2/videobuf2-core.c
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@ -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;