if ((err = tty_register_ldisc(N_HCI, NULL))) 
if ((err = tty_unregister_ldisc(N_HCI))) 
static void __exit hci_uart_exit(void){	int err;#ifdef CONFIG_BT_HCIUART_H4	h4_deinit();#endif#ifdef CONFIG_BT_HCIUART_BCSP	bcsp_deinit();#endif	/* Release tty registration of line discipline */	if ((err = tty_register_ldisc(N_HCI, NULL)))		BT_ERR("Can't unregister HCI line discipline (%d)", err);}
4520	/local/tlutelli/issta_data/temp/c/2005_temp/2005/4520/64ccd715d3cf498318b14b646ce5f97e7ab15bb5/hci_ldisc.c/clean/drivers/bluetooth/hci_ldisc.c