diff --git a/[refs] b/[refs]
index f51ec91c82af..d04ae9a09009 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 17d80d562fd78a035e994afde88f354973e76236
+refs/heads/master: 62ad296b6ca78bd123864c138814c0a597873693
diff --git a/trunk/drivers/usb/serial/usb-serial.c b/trunk/drivers/usb/serial/usb-serial.c
index 3bcf33466587..353798631903 100644
--- a/trunk/drivers/usb/serial/usb-serial.c
+++ b/trunk/drivers/usb/serial/usb-serial.c
@@ -283,7 +283,10 @@ static void serial_close(struct tty_struct *tty, struct file * filp)
 	}
 
 	if (port->open_count == 0) {
-		usb_autopm_put_interface(port->serial->interface);
+		mutex_lock(&port->serial->disc_mutex);
+		if (!port->serial->disconnected)
+			usb_autopm_put_interface(port->serial->interface);
+		mutex_unlock(&port->serial->disc_mutex);
 		module_put(port->serial->type->driver.owner);
 	}