diff --git a/drivers/macintosh/macio-adb.c b/drivers/macintosh/macio-adb.c
index dc634c2932fd..dd2465586140 100644
--- a/drivers/macintosh/macio-adb.c
+++ b/drivers/macintosh/macio-adb.c
@@ -105,6 +105,10 @@ int macio_init(void)
 		return -ENXIO;
 	}
 	adb = ioremap(r.start, sizeof(struct adb_regs));
+	if (!adb) {
+		of_node_put(adbs);
+		return -ENOMEM;
+	}
 
 	out_8(&adb->ctrl.r, 0);
 	out_8(&adb->intr.r, 0);