diff --git a/[refs] b/[refs]
index b08f271c99ac..daaf6e60da35 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 4186c29ca199063facdda49851b4c863699687b1
+refs/heads/master: b059c81af7a1759a911cfc20ce8a4bf47c435830
diff --git a/trunk/drivers/usb/serial/usb-serial.c b/trunk/drivers/usb/serial/usb-serial.c
index cbca3402d6cd..92c213fa9317 100644
--- a/trunk/drivers/usb/serial/usb-serial.c
+++ b/trunk/drivers/usb/serial/usb-serial.c
@@ -237,6 +237,8 @@ static int serial_open (struct tty_struct *tty, struct file * filp)
 	module_put(serial->type->driver.owner);
 bailout_mutex_unlock:
 	port->open_count = 0;
+	tty->driver_data = NULL;
+	port->tty = NULL;
 	mutex_unlock(&port->mutex);
 bailout_kref_put:
 	usb_serial_put(serial);