tree c00d06140b85cb18df9306ce1fba265a3f106ff3
parent c50c9c1e659d8de9c13441f243e7938413be6e71
author Kieran Bingham <kieran.bingham@ideasonboard.com> 1489671185 -0400
committer Mauro Carvalho Chehab <mchehab+samsung@kernel.org> 1543997529 -0500

media: uvcvideo: queue: Support asynchronous buffer handling

The buffer queue interface currently operates sequentially, processing
buffers after they have fully completed.

In preparation for supporting parallel tasks operating on the buffers,
we will need to support buffers being processed on multiple CPUs.

Adapt the uvc_queue_next_buffer() such that a reference count tracks the
active use of the buffer, returning the buffer to the VB2 stack at
completion.

Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>