diff --git a/[refs] b/[refs]
index 367126164678..7668dd0d4c41 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: cef03f8f1d5042e85de431d739eeded89d79999b
+refs/heads/master: 21ae1dd1d4948968ad2d923c5e104d38fb35b4e4
diff --git a/trunk/drivers/usb/serial/airprime.c b/trunk/drivers/usb/serial/airprime.c
index 725b6b94c274..7290b41fa11c 100644
--- a/trunk/drivers/usb/serial/airprime.c
+++ b/trunk/drivers/usb/serial/airprime.c
@@ -220,7 +220,7 @@ static void airprime_close(struct usb_serial_port *port, struct file * filp)
 	mutex_lock(&port->serial->disc_mutex);
 	if (!port->serial->disconnected)
 		airprime_send_setup(port);
-	mutex_lock(&port->serial->disc_mutex);
+	mutex_unlock(&port->serial->disc_mutex);
 
 	for (i = 0; i < NUM_READ_URBS; ++i) {
 		usb_kill_urb (priv->read_urbp[i]);