diff --git a/kernel/reboot.c b/kernel/reboot.c
index d177d89fcc33..77c1521cf32b 100644
--- a/kernel/reboot.c
+++ b/kernel/reboot.c
@@ -804,8 +804,8 @@ 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: