serial8250_em485_handle_start_tx  575 drivers/tty/serial/8250/8250_port.c static enum hrtimer_restart serial8250_em485_handle_start_tx(struct hrtimer *t);
serial8250_em485_handle_start_tx  636 drivers/tty/serial/8250/8250_port.c 	p->em485->start_tx_timer.function = &serial8250_em485_handle_start_tx;