unregister_serial(port->line); 
serial8250_unregister_port(port->line); 
static void __exit hp300_8250_exit(void){#ifdef CONFIG_HPAPCI	struct hp300_port *port, *to_free;	for (port = hp300_ports; port; ) {		unregister_serial(port->line);		to_free = port;		port = port->next;		kfree(to_free);	}	hp300_ports = NULL;#endif#ifdef CONFIG_HPDCA	dio_unregister_driver(&hpdca_driver);#endif}
4520	/local/tlutelli/issta_data/temp/c/2005_temp/2005/4520/2b49abac5855aff9b42cf2cdb5376ac805bebd86/8250_hp300.c/clean/drivers/serial/8250_hp300.c