drm_gem_object_free
EXPORT_SYMBOL(drm_gem_object_free);
kref_put(&obj->refcount, drm_gem_object_free);
else if (kref_put_mutex(&obj->refcount, drm_gem_object_free,
kref_put(&obj->refcount, drm_gem_object_free);
void drm_gem_object_free(struct kref *kref);
kref_put(&obj->refcount, drm_gem_object_free);