[PATCH] dma-buf/sync-file: Avoid enable fence signaling if poll(.timeout=0)

[Sumit Semwal]

Hi Chris,

On 29 August 2016 at 23:56, Gustavo Padovan <gustavo at padovan.org> wrote:
> Hi Chris,
>
> 2016-08-29 Chris Wilson <chris at chris-wilson.co.uk>:
>
>> If we being polled with a timeout of zero, a nonblocking busy query,
>> we don't need to install any fence callbacks as we will not be waiting.
>> As we only install the callback once, the overhead comes from the atomic
>> bit test that also causes serialisation between threads.
>>
>> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
>> Cc: Sumit Semwal <sumit.semwal at linaro.org>
>> Cc: Gustavo Padovan <gustavo at padovan.org>
>> Cc: linux-media at vger.kernel.org
>> Cc: dri-devel at lists.freedesktop.org
>> Cc: linaro-mm-sig at lists.linaro.org
>> ---
>>  drivers/dma-buf/sync_file.c | 3 ++-
>>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> Indeed, we can shortcut this.
>
> Reviewed-by: Gustavo Padovan <gustavo.padovan at collabora.co.uk>
>
> Gustavo

Thanks; pushed to drm-misc.

Best,
Sumit.