drm/i915: Flush the i915_vm_release before ggtt shutdown
As the gen6_ppgtt may refer back to the GGTT for their page-directory slots, make sure those __i915_vm_release are completed prior to shutting down the GGTT. Fixes: b32fa811 ("drm/i915/gtt: Defer address space cleanup to an RCU worker") Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190729132412.23380-1-chris@chris-wilson.co.uk
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