module_put(port->serial->type->owner); 
module_put(port->serial->type->driver.owner); 
static void serial_close(struct tty_struct *tty, struct file * filp){	struct usb_serial_port *port = tty->driver_data;	if (!port)		return;	dbg("%s - port %d", __FUNCTION__, port->number);	if (port->open_count == 0)		return;	--port->open_count;	if (port->open_count == 0) {		/* only call the device specific close if this 		 * port is being closed by the last owner */		port->serial->type->close(port, filp);		if (port->tty) {			if (port->tty->driver_data)				port->tty->driver_data = NULL;			port->tty = NULL;		}		module_put(port->serial->type->owner);	}	kref_put(&port->serial->kref, destroy_serial);}
4520	/local/tlutelli/issta_data/temp/c/2005_temp/2005/4520/18fcac353fdc7cd072b0d24c8667042e675a4c11/usb-serial.c/clean/drivers/usb/serial/usb-serial.c