diff --git a/drivers/usb/serial/io_ti.c b/drivers/usb/serial/io_ti.c
index bdb44fc542a1..1f145bfb7f41 100644
--- a/drivers/usb/serial/io_ti.c
+++ b/drivers/usb/serial/io_ti.c
@@ -558,6 +558,9 @@ static void chase_port(struct edgeport_port *port, unsigned long timeout,
 	wait_queue_t wait;
 	unsigned long flags;
 
+	if (!tty)
+		return;
+
 	if (!timeout)
 		timeout = (HZ * EDGE_CLOSING_WAIT)/100;