diff --git a/kernel/reboot.c b/kernel/reboot.c
index 5b9691f45f5f..bc2716677a6c 100644
--- a/kernel/reboot.c
+++ b/kernel/reboot.c
@@ -813,8 +813,8 @@ SYSCALL_DEFINE4(reboot, int, magic1, int, magic2, unsigned int, cmd,
 
 #ifdef CONFIG_HIBERNATION
 	case LINUX_REBOOT_CMD_SW_SUSPEND:
-		ret = hibernate();
-		break;
+		mutex_unlock(&system_transition_mutex);
+		return hibernate();
 #endif
 
 	default: