- * and interrupt read if they exists */
- if (serial->dev) {
- dbg("Shutdown bulk write");
- usb_kill_urb(port->write_urb);
- dbg("Shutdown bulk read");
- usb_kill_urb(port->read_urb);
+ * and interrupt read if they exists, otherwise nop */
+ dbg("Shutdown bulk write");
+ usb_kill_urb(port->write_urb);
+ dbg("Shutdown bulk read");
+ usb_kill_urb(port->read_urb);
+
+ mutex_lock(&serial->disc_mutex);
+ /* these commands must not be issued if the device has
+ * been disconnected */
+ if (!serial->disconnected) {
+ data = 0x00;
+ send_mos_cmd(serial, MOS_WRITE, port->number - port->serial->minor,
+ 0x04, &data);
+
+ data = 0x00;
+ send_mos_cmd(serial, MOS_WRITE, port->number - port->serial->minor,
+ 0x01, &data);