[PATCH v3] drm/fence: allow fence waiting to be interrupted by userspace

[Maarten Lankhorst]

Op 25-08-16 om 18:47 schreef Gustavo Padovan:
> From: Gustavo Padovan <gustavo.padovan at collabora.co.uk>
>
> If userspace is running an synchronously atomic commit and interrupts the
> atomic operation during fence_wait() it will hang until the timer expires,
> so here we change the wait to be interruptible so it stop immediately when
> userspace wants to quit.
>
> Also adds the necessary error checking for fence_wait().
>
> v2: Comment by Daniel Vetter
> 	- Add error checking for fence_wait()
>
> v3: Rebase on top of new atomic noblocking support
>
> v4: Comment by Maarten Lankhorst
> 	- remove 'swapped' bitfield as it was duplicating information
>
> v5: Comments by Maarten Lankhorst
> 	- assign plane->state to plane_state if !intr
> 	- squash previous patch into this one
>
> Signed-off-by: Gustavo Padovan <gustavo.padovan at collabora.co.uk>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>