linux-kernel - Re: [PATCH v2 2/3] tty: Add lookahead param to receive

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Date:   Fri, 8 Apr 2022 14:58:52 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Cc:     linux-serial@...r.kernel.org, Greg KH <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        linux-kernel@...r.kernel.org,
        Gilles Buloz <gilles.buloz@...tron.com>,
        Johan Hovold <johan@...nel.org>
Subject: Re: [PATCH v2 2/3] tty: Add lookahead param to receive_buf

On Fri, Apr 08, 2022 at 02:39:53PM +0300, Ilpo Järvinen wrote:
> After lookahead for XON/XOFF characters is added by the next
> patch, the receive side needs to ensure the flow-control
> actions are not retaken later on when those same characters
> get read by TTY.
> 
> Thus, pass lookahead count to receive_buf and skip
> flow-control character actions if already taken for the
> character in question. Lookahead count will become live after
> the next patch.

...

> +		if (c == STOP_CHAR(tty)) {
> +			if (!lookahead_done)

But now it can be as below

		if (c == STOP_CHAR(tty) && !lookahead_done)

> +				stop_tty(tty);
> +		} else if ((c == START_CHAR(tty) && !lookahead_done) ||
>  			 (tty->flow.stopped && !tty->flow.tco_stopped && I_IXANY(tty) &&
>  			  c != INTR_CHAR(tty) && c != QUIT_CHAR(tty) &&
>  			  c != SUSP_CHAR(tty))) {


-- 
With Best Regards,
Andy Shevchenko