port->write_urb_busy = 0; 
void usb_serial_generic_write_bulk_callback (struct urb *urb, struct pt_regs *regs){	struct usb_serial_port *port = (struct usb_serial_port *)urb->context;	dbg("%s - port %d", __FUNCTION__, port->number);	if (urb->status) {		dbg("%s - nonzero write bulk status received: %d", __FUNCTION__, urb->status);		return;	}	usb_serial_port_softint((void *)port);	schedule_work(&port->work);}
4520	/local/tlutelli/issta_data/temp/c/2005_temp/2005/4520/507ca9bc0476662f3463888d583864834eab1e11/generic.c/clean/drivers/usb/serial/generic.c