diff --git a/drivers/usb/serial/usb-serial.c b/drivers/usb/serial/usb-serial.c
index 9a26178..7317289 100644
--- a/drivers/usb/serial/usb-serial.c
+++ b/drivers/usb/serial/usb-serial.c
@@ -204,6 +204,11 @@
 		goto bailout_kref_put;
 	}
 
+	if (port->serial->disconnected) {
+		retval = -ENODEV;
+		goto bailout_kref_put;
+	}
+
 	if (mutex_lock_interruptible(&port->mutex)) {
 		retval = -ERESTARTSYS;
 		goto bailout_kref_put;