> ch = inb(port->ioaddr + UART_RX);
> - tty_insert_flip_char(tty, ch, 0);
> + ret = tty_insert_flip_char(tty, ch, 0);
> + if (ret != 1) {
> + if (!port->ldisc_stop_rx)
> + mxser_stoprx(tty);
> + }
This can all just go. The tty layer calls down for stop/start events and
the flow control handles it. There is enough asynchronous buffering to
handle the rest. Just insert them and honour stop/start. By the time
tty_insert_flip_char returns 0 you are in an out of memory/64K buffering
full *after* being told to stop situation.
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