Backmerge the main drm-next pull to sync up.

Chris also pointed out that

commit ade0b0c9
Author: Chris Wilson <chris@chris-wilson.co.uk>
Date:   Sat Apr 22 09:15:37 2017 +0100

    drm/i915: Confirm the request is still active before adding it to the await

is double-applied in the git merge, so make sure we get this right.
Signed-off-by: NDaniel Vetter <daniel.vetter@intel.com>