drm/i915: Be defensive when starting vma activity
Before we acquire the vma for GPU activity, ensure that the underlying object is not already in the process of being freed. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Matthew Auld <matthew.auld@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190820100531.8430-1-chris@chris-wilson.co.uk
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