[PATCH] dma-buf: avoid scheduling on fence status query v2

[Gustavo Padovan]

2017-04-26 Christian König <deathsimple at vodafone.de>:

> Am 26.04.2017 um 16:46 schrieb Andres Rodriguez:
> > When a timeout of zero is specified, the caller is only interested in
> > the fence status.
> > 
> > In the current implementation, dma_fence_default_wait will always call
> > schedule_timeout() at least once for an unsignaled fence. This adds a
> > significant overhead to a fence status query.
> > 
> > Avoid this overhead by returning early if a zero timeout is specified.
> > 
> > v2: move early return after enable_signaling
> > 
> > Signed-off-by: Andres Rodriguez <andresx7 at gmail.com>
> 
> Reviewed-by: Christian König <christian.koenig at amd.com>

pushed to drm-misc-next. Thanks all.

Gustavo