drm/i915/gt: Do not restore invalid RS state
Only restore valid resource streamer state from the context image, i.e. avoid restoring if we know the image is invalid. Closes: https://gitlab.freedesktop.org/drm/intel/issues/446Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Matthew Auld <matthew.auld@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20191229183153.3719869-4-chris@chris-wilson.co.uk Cc: stable@vger.kernel.org
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