--- x/drivers/net/caif/caif_serial.c
+++ y/drivers/net/caif/caif_serial.c
@@ -308,6 +308,7 @@ static void ser_release(struct work_stru
 		list_for_each_entry_safe(ser, tmp, &list, node) {
 			dev_close(ser->dev);
 			unregister_netdevice(ser->dev);
+			tty_kref_put(ser->tty);
 			debugfs_deinit(ser);
 		}
 		rtnl_unlock();
@@ -369,8 +370,6 @@ static void ldisc_close(struct tty_struc
 {
 	struct ser_device *ser = tty->disc_data;
 
-	tty_kref_put(ser->tty);
-
 	spin_lock(&ser_lock);
 	list_move(&ser->node, &ser_release_list);
 	spin_unlock(&ser_lock);