DRIVER_SG
if (!drm_core_check_feature(dev, DRIVER_SG))
|| (drm_core_check_feature(dev, DRIVER_SG)
if (!drm_core_check_feature(dev, DRIVER_SG))
if (drm_core_check_feature(dev, DRIVER_SG) && dev->sg &&
if (!drm_core_check_feature(dev, DRIVER_SG))