--- zzzz-none-000/linux-2.6.32.61/drivers/usb/serial/mos7840.c	2013-06-10 09:43:48.000000000 +0000
+++ virian-300e-630/linux-2.6.32.61/drivers/usb/serial/mos7840.c	2013-02-11 16:39:19.000000000 +0000
@@ -2569,6 +2569,7 @@
 		kfree(mos7840_port->ctrl_buf);
 		usb_free_urb(mos7840_port->control_urb);
 		kfree(mos7840_port);
+		serial->port[i] = NULL;
 	}
 	return status;
 }
@@ -2635,7 +2636,6 @@
 		mos7840_port = mos7840_get_port_private(serial->port[i]);
 		dbg("mos7840_port %d = %p", i, mos7840_port);
 		if (mos7840_port) {
-			usb_free_urb(mos7840_port->control_urb);
 			kfree(mos7840_port->ctrl_buf);
 			kfree(mos7840_port->dr);
 			kfree(mos7840_port);