4.4-stable review patch. If anyone has any objections, please let me know.
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From: Hans Verkuil hans.verkuil@cisco.com
[ Upstream commit 90b2da89a083e1395cb322521a42397c49ae4500 ]
When a buffer is queued or requeued in vb2_buffer_done, then don't call the finish memop. In this case the buffer is only returned to vb2, not to userspace.
Calling 'finish' here will cause an unbalance when the queue is canceled, since the core will call the same memop again.
Signed-off-by: Hans Verkuil hans.verkuil@cisco.com Signed-off-by: Mauro Carvalho Chehab mchehab+samsung@kernel.org Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/media/v4l2-core/videobuf2-core.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-)
--- a/drivers/media/v4l2-core/videobuf2-core.c +++ b/drivers/media/v4l2-core/videobuf2-core.c @@ -870,9 +870,12 @@ void vb2_buffer_done(struct vb2_buffer * dprintk(4, "done processing on buffer %d, state: %d\n", vb->index, state);
- /* sync buffers */ - for (plane = 0; plane < vb->num_planes; ++plane) - call_void_memop(vb, finish, vb->planes[plane].mem_priv); + if (state != VB2_BUF_STATE_QUEUED && + state != VB2_BUF_STATE_REQUEUEING) { + /* sync buffers */ + for (plane = 0; plane < vb->num_planes; ++plane) + call_void_memop(vb, finish, vb->planes[plane].mem_priv); + }
spin_lock_irqsave(&q->done_lock, flags); if (state == VB2_BUF_STATE_QUEUED ||