diff --git a/[refs] b/[refs]
index c698e143e3a8..e2d463f1e5db 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 1541f845d123a48fbca3cee32b2963b3fb3da83a
+refs/heads/master: 1e66cded334e6cea596c72f6f650eec351b1e959
diff --git a/trunk/drivers/tty/serial/serial_core.c b/trunk/drivers/tty/serial/serial_core.c
index 59fb3ba1e7ca..a21dc8e3b7c0 100644
--- a/trunk/drivers/tty/serial/serial_core.c
+++ b/trunk/drivers/tty/serial/serial_core.c
@@ -2282,6 +2282,7 @@ void uart_unregister_driver(struct uart_driver *drv)
 	tty_unregister_driver(p);
 	put_tty_driver(p);
 	kfree(drv->state);
+	drv->state = NULL;
 	drv->tty_driver = NULL;
 }