Quoting Chris Wilson (2020-02-10 16:42:15)
> We manipulate ring->head while active in i915_request_retire underneath
> the timeline manipulation. We cannot rely on a stable ring->head outside
> of the timeline->mutex, in particular while setting up the context for
> resume and reset.
>
> Closes: https://gitlab.freedesktop.org/drm/intel/issues/1126
Fixes: 0881954965e3 ("drm/i915: Introduce intel_context.pin_mutex for pin
management")
Fixes: e5dadff4b093 ("drm/i915: Protect request retirement with
timeline->mutex")
> References: f3c0efc9fe7a ("drm/i915/execlists: Leave resetting ring to
> intel_ring")
> Signed-off-by: Chris Wilson <[email protected]>
> Cc: Matthew Auld <[email protected]>
> Cc: Tvrtko Ursulin <[email protected]>
> Cc: Mika Kuoppala <[email protected]>
-Chris
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