8bcad07a45
From commit73dec95e6b("drm/i915: Emit to ringbuffer directly"), copy_gma_to_hva() now returns copied data length instead of 0, so need to change error return check for that. Note: Looks this is caused by backmerge conflict resolving, so 4.11-rc4 is not impacted as commit73dec95e6b("drm/i915: Emit to ringbuffer directly") is not in 4.11. But need to fix this before I can apply 4.12 stuff against drm-intel-next correctly. Fixes:e5c1ff1475("Backmerge tag 'v4.11-rc4' into drm-next") Cc: Dave Airlie <airlied@redhat.com> Cc: Tina Zhang <tina.zhang@intel.com> Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com> Signed-off-by: Dave Airlie <airlied@redhat.com>