linux-kernel - Re: [RFC PATCH 4/6] serio: serport: add support for buffered write and receive

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Message-ID: <20160826201202.GA27227@amd>
Date:   Fri, 26 Aug 2016 22:12:02 +0200
From:   Pavel Machek <pavel@....cz>
To:     Rob Herring <robh@...nel.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Marcel Holtmann <marcel@...tmann.org>,
        Jiri Slaby <jslaby@...e.com>,
        Sebastian Reichel <sre@...nel.org>,
        Arnd Bergmann <arnd@...db.de>,
        "Dr . H . Nikolaus Schaller" <hns@...delico.com>,
        Alan Cox <gnomes@...rguk.ukuu.org.uk>,
        Loic Poulain <loic.poulain@...el.com>,
        Peter Hurley <peter@...leysoftware.com>,
        NeilBrown <neil@...wn.name>,
        Linus Walleij <linus.walleij@...aro.org>,
        linux-bluetooth@...r.kernel.org, linux-serial@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 4/6] serio: serport: add support for buffered write
 and receive

Hi!

> @@ -133,26 +133,29 @@ static void serport_ldisc_receive(struct tty_struct *tty, const unsigned char *c
>  	if (!test_bit(SERPORT_ACTIVE, &serport->flags))
>  		goto out;
>  
> -	for (i = 0; i < count; i++) {
> -		if (fp) {
> -			switch (fp[i]) {
> -			case TTY_FRAME:
> -				ch_flags = SERIO_FRAME;
> -				break;
> -
> -			case TTY_PARITY:
> -				ch_flags = SERIO_PARITY;
> -				break;
> -
> -			default:
> -				ch_flags = 0;
> -				break;
> +	if (serio_buffered_mode_enabled(serport->serio)) {
> +		serio_receive_buf(serport->serio, cp, count);

Elsewhere:
+       /* Use buffer receive if the driver provides a callback */
+       if (drv->receive_buf)
+               set_bit(SERIO_MODE_BUFFERED, &drv->flags);

Could we use if (drv->receive_buf) above directly, and not require the
bitfield?

Thanks,
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html