drm/virtio: blob prep: refactor getting pages and attaching backing

Useful for upcoming blob resources.
Signed-off-by: Gurchetan Singh <gurchetansingh@chromium.org>
Acked-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20200924003214.662-1-gurchetansingh@chromium.orgSigned-off-by: Gerd Hoffmann <kraxel@redhat.com>

drivers/gpu/drm/virtio/virtgpu_object.c

@@ -229,21 +229,21 @@ int virtio_gpu_object_create(struct virtio_gpu_device *vgdev,
 			goto err_put_objs;
 	}
 
-	if (params->virgl) {
-		virtio_gpu_cmd_resource_create_3d(vgdev, bo, params,
-						  objs, fence);
-	} else {
-		virtio_gpu_cmd_create_resource(vgdev, bo, params,
-					       objs, fence);
-	}
-
 	ret = virtio_gpu_object_shmem_init(vgdev, bo, &ents, &nents);
 	if (ret != 0) {
 		virtio_gpu_free_object(&shmem_obj->base);
 		return ret;
 	}
 
+	if (params->virgl) {
+		virtio_gpu_cmd_resource_create_3d(vgdev, bo, params,
+						  objs, fence);
+		virtio_gpu_object_attach(vgdev, bo, ents, nents);
+	} else {
+		virtio_gpu_cmd_create_resource(vgdev, bo, params,
+					       objs, fence);
 		virtio_gpu_object_attach(vgdev, bo, ents, nents);
+	}
 
 	*bo_ptr = bo;
 	return 0;