drm/i915: Object w/o backing storage is banned by -ENXIO
-ENXIO should be returned when operations are banned from changing backing storage of objects without backing storage. v4: - update "Reviewed-by". (Joonas) v3: - separate this patch from "Introduce GEM proxy" patch-set. (Joonas) v2: - update the patch description and subject to just mention objects w/o backing storage, instead of "GEM proxy". (Joonas) Signed-off-by: NTina Zhang <tina.zhang@intel.com> Reviewed-by: NChris Wilson <chris@chris-wilson.co.uk> Link: https://patchwork.freedesktop.org/patch/msgid/1510555798-21079-1-git-send-email-tina.zhang@intel.comReviewed-by: NJoonas Lahtinen <joonas.lahtinen@linux.intel.com> Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk> Link: https://patchwork.freedesktop.org/patch/msgid/20171114102513.22269-1-chris@chris-wilson.co.uk
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