On 06/16/17 09:39, Gustavo Padovan wrote:
> From: Gustavo Padovan <[email protected]>
>
> If V4L2_BUF_FLAG_OUT_FENCE flag is present on the QBUF call we create
> an out_fence for the buffer and return it to userspace on the fence_fd
> field. It only works with ordered queues.
>
> The fence is signaled on buffer_done(), when the job on the buffer is
> finished.
>
> v2: check if the queue is ordered.
>
> Signed-off-by: Gustavo Padovan <[email protected]>
> ---
> drivers/media/v4l2-core/videobuf2-core.c | 6 ++++++
> drivers/media/v4l2-core/videobuf2-v4l2.c | 22 +++++++++++++++++++++-
> 2 files changed, 27 insertions(+), 1 deletion(-)
>
<snip>
> diff --git a/drivers/media/v4l2-core/videobuf2-v4l2.c
> b/drivers/media/v4l2-core/videobuf2-v4l2.c
> index e6ad77f..e2733dd 100644
> --- a/drivers/media/v4l2-core/videobuf2-v4l2.c
> +++ b/drivers/media/v4l2-core/videobuf2-v4l2.c
> @@ -204,9 +204,14 @@ static void __fill_v4l2_buffer(struct vb2_buffer *vb,
> void *pb)
> b->timestamp = ns_to_timeval(vb->timestamp);
> b->timecode = vbuf->timecode;
> b->sequence = vbuf->sequence;
> - b->fence_fd = -1;
> + b->fence_fd = vb->out_fence_fd;
I forgot to ask: can a buffer have both an in and an out fence? If so, then we
have a problem here since we can report only one fence fd.
If it is not allowed, then we need a check for that somewhere.
Regards,
Hans
