Re: serial flow control appears broken

[Lee Howard <faxguy@howardsilvan.com>]

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.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/