Maciej W. Rozycki wrote:
The TTY line discipline driver could do that based on the amount of
received data present in its buffer. And it should if asked to (a brief
look at drivers/char/n_tty.c reveals it does; obviously there may be a bug
somewhere though). So could e.g. the SLIP and PPP line discipline
drivers, though the criteria might be different (apparently they do not,
which is a shame).
The serial drivers have nothing to do about it -- all they can do is
pushing data upstream, to the discipline driver. They can provide an
interface to hardware flow control features though, if implemented by a
given UART.
Thank you for this clarification. So I should have more correctly been
saying that "tty flow control appears broken". Right?
I've asked the manufacturer to take a look at drivers/char/n_tty.c to
see if they can't see anything obvious.
Thanks,
Lee.
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