diff --git a/drivers/accel/ethosu/ethosu_gem.c b/drivers/accel/ethosu/ethosu_gem.c
index ced99cf9cdfc..863cdadb137a 100644
--- a/drivers/accel/ethosu/ethosu_gem.c
+++ b/drivers/accel/ethosu/ethosu_gem.c
@@ -431,8 +431,7 @@ static int ethosu_gem_cmdstream_copy_and_validate(struct drm_device *ddev,
 				return ret;
 			break;
 		case NPU_OP_RESIZE: // U85 only
-			WARN_ON(1); // TODO
-			break;
+			return -EINVAL;
 		case NPU_SET_KERNEL_WIDTH_M1:
 			st.ifm.width = param;
 			break;