--- a/drivers/mtd/ubi/build.c
+++ b/drivers/mtd/ubi/build.c
@@ -1223,7 +1223,7 @@ static int __init ubi_init(void)

                mtd = open_mtd_device(p->name);
                if (IS_ERR(mtd)) {
-                       err = PTR_ERR(mtd);
+                       err = -EPROBE_DEFER;
                        goto out_detach;
                }