From b646f0b7290c2cb68450c61256eb475e44437026 Mon Sep 17 00:00:00 2001 From: Laurent Pinchart Date: Sun, 20 Apr 2014 20:55:41 -0300 Subject: [PATCH] [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 Reviewed-by: Hans Verkuil Signed-off-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab --- drivers/media/v4l2-core/videobuf2-core.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/drivers/media/v4l2-core/videobuf2-core.c b/drivers/media/v4l2-core/videobuf2-core.c index 40024d7daf00..8d37e291f722 100644 --- a/drivers/media/v4l2-core/videobuf2-core.c +++ b/drivers/media/v4l2-core/videobuf2-core.c @@ -2087,9 +2087,6 @@ static void __vb2_queue_cancel(struct vb2_queue *q) */ if (q->start_streaming_called) 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))) { 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)); } + q->streaming = 0; + q->start_streaming_called = 0; + q->queued_count = 0; + /* * Remove all buffers from videobuf's list... */ -- 2.20.1