[Intel-gfx] [PATCH 05/22] drm/i915: Lock the gem_context->active_list while dropping the link

[Chris Wilson]

Quoting Chris Wilson (2019-03-18 09:51:47)
> On unpinning the intel_context, we remove it from the active list
> inside the GEM context. This list is supposed to be guarded by the GEM
> context mutex, so remember to take it!
> 

Fixes: 7e3d9a59410d ("drm/i915: Track active engines within a context")
-Chris