Re: [PATCH] TTY: tty flip buffer with synchronous line disciplines.

[Alan Cox]

On Mon, 14 Nov 2011 21:41:36 +0400
Ilya Zykov <ilya@xxxxxxx> wrote:

> For use flip buffer with synchronous line disciplines(n_hdlc, ppp_synctty).

If you are doing synchronous protocols then they shouldn't be going via
the tty loopback in the first place. Why can't you use tuntap and the
like for synchronous protocols ? Stuffing them through the tty layer is a
bad hack anyway and not one we should encourage further.

> +	if ((b = tty->buf.tail) != NULL  && !tty->pty_sync)
>  		left = b->size - b->used;

What stops tty->pty_sync changing under the line discipline btw ?

Alan
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