[Intel-gfx] [PATCH v3] drm/i915: Add to timeline requires the timeline mutex

[Chris Wilson]

Quoting Chris Wilson (2019-07-08 14:47:05)
> I'm considering how best to add lockdep to highlight that. I think if I
> add a struct mutex *lock to i915_active_request, and make it only exist
> under debug?

The problem with that is that I need to find some way to communicate
when I'm deliberately lying... (Because we have the global engine-pm
barrier)
-Chris