[PATCH 2/2] dma-fence: Refactor signaling for manual invocation

[Chris Wilson]

Quoting Chris Wilson (2019-05-08 13:05:42)
> Move the duplicated code within dma-fence.c into the header for wider
> reuse. In the process apply a small micro-optimisation to only prune the
> fence->cb_list once rather than use list_del on every entry.
> 
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>

Not yet r-b, just Tvrtko gave a nod of approval that this would be
suitable discussion material.
-Chris