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;