diff --git a/kernel/stop_machine.c b/kernel/stop_machine.c
index dcfb5d731466257f7f003ba5eb84083f0185d22c..51cacd111dbd8412c35a1d9578cfb3d7eaf86c6a 100644
--- a/kernel/stop_machine.c
+++ b/kernel/stop_machine.c
@@ -111,7 +111,6 @@ static int stop_machine(void)
 	/* If some failed, kill them all. */
 	if (ret < 0) {
 		stopmachine_set_state(STOPMACHINE_EXIT);
-		up(&stopmachine_mutex);
 		return ret;
 	}