--- linux-old/drivers/usb/serial/usbserial.c	2005-08-28 20:23:40.000000000 +0200
+++ linux/drivers/usb/serial/usbserial.c	2005-08-28 20:23:12.000000000 +0200
@@ -499,6 +499,19 @@
 		/* get_usb_serial checks port->tty, so cannot be used */
 		serial = port->serial;
 		if (port->write_busy) {
+
+			/*-- how is the status of the outgoing urb? --*/
+			/*-- did we miss a callback? --*/
+			/*-- problem with the hack below is that we may */
+			/*   corrup structures we currently walk thru */
+			if (port->write_urb && port->write_urb->status != -EINPROGRESS) {
+				if (port->write_urb->complete)
+					port->write_urb->complete(port->write_urb);
+				else
+					dbg("%s: URB %p has no complete function\n", __FUNCTION__, port->write_urb);
+			}
+
+
 			dbg("%s - port %d busy", __FUNCTION__, port->number);
 			pos = pos->next;
 			continue;