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[media] v4l: vb2: Avoid double WARN_ON when stopping streaming 

The __vb2_queue_cancel function marks the queue as not streaming and
then WARNs when buffers are still owned by the driver. It proceeds to
complete all active buffers by calling vb2_buffer_done with the new
buffer state set to VB2_BUF_STATE_ERROR in that case. This triggers
another WARN_ON due to as new state not being VB2_BUF_STATE_QUEUED while
the queue is not streaming.

Check buffer ownership and complete all active buffers before marking
the queue as not streaming to avoid the double WARN_on.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
This commit is contained in:
Laurent Pinchart 2014-04-20 20:55:41 -03:00 committed by Mauro Carvalho Chehab
parent a5c075cfd2
commit b646f0b729
1 changed files with 4 additions and 3 deletions
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7
drivers/media/v4l2-core/videobuf2-core.c
View File

@ -2087,9 +2087,6 @@ static void __vb2_queue_cancel(struct vb2_queue *q)
*/ */
if (q->start_streaming_called) if (q->start_streaming_called)
call_void_qop(q, stop_streaming, q); call_void_qop(q, stop_streaming, q);
q->streaming = 0;
q->start_streaming_called = 0;
q->queued_count = 0;
if (WARN_ON(atomic_read(&q->owned_by_drv_count))) { if (WARN_ON(atomic_read(&q->owned_by_drv_count))) {
for (i = 0; i < q->num_buffers; ++i) for (i = 0; i < q->num_buffers; ++i)
@ -2099,6 +2096,10 @@ static void __vb2_queue_cancel(struct vb2_queue *q)
WARN_ON(atomic_read(&q->owned_by_drv_count)); WARN_ON(atomic_read(&q->owned_by_drv_count));
} }
q->streaming = 0;
q->start_streaming_called = 0;
q->queued_count = 0;
/* /*
* Remove all buffers from videobuf's list... * Remove all buffers from videobuf's list...
*/ */