radeon_bo_unreserve(bo);
  }
  
 +
 +struct reservation_object *radeon_gem_prime_res_obj(struct drm_gem_object *obj)
 +{
 +      struct radeon_bo *bo = gem_to_radeon_bo(obj);
 +
 +      return bo->tbo.resv;
 +}
++
+ struct dma_buf *radeon_gem_prime_export(struct drm_device *dev,
+                                       struct drm_gem_object *gobj,
+                                       int flags)
+ {
+       struct radeon_bo *bo = gem_to_radeon_bo(gobj);
+       if (radeon_ttm_tt_has_userptr(bo->tbo.ttm))
+               return ERR_PTR(-EPERM);
+       return drm_gem_prime_export(dev, gobj, flags);
+ }