linux-kernel - Re: [PATCH 4/4] tty/serial: sh-sci: remove uneeded IS_ERR_OR

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Date:   Mon, 20 Mar 2017 12:07:18 +0100
From:   Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Richard Genoud <richard.genoud@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Boris Brezillon <boris.brezillon@...e-electrons.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Janusz Uzycki <j.uzycki@...roma.com.pl>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>
Subject: Re: [PATCH 4/4] tty/serial: sh-sci: remove uneeded IS_ERR_OR_NULL
 calls

Hello Geert,

On Mon, Mar 20, 2017 at 11:38:52AM +0100, Geert Uytterhoeven wrote:
> On Mon, Mar 20, 2017 at 11:31 AM, Uwe Kleine-König
> <u.kleine-koenig@...gutronix.de> wrote:
> > On Mon, Mar 20, 2017 at 10:56:14AM +0100, Geert Uytterhoeven wrote:
> >> Documentation/gpio/consumer.txt rightfully sates:
> >> | Note that gpio_get*_optional() functions (and their managed variants), unlike
> >> | the rest of gpiolib API, also return NULL when gpiolib support is disabled.
> >> | This is helpful to driver authors, since they do not need to special case
> >> | -ENOSYS return codes.  System integrators should however be careful to enable
> >> | gpiolib on systems that need it.
> >
> > I cannot find this paragraph in Documentation/gpio/consumer.txt:
> >
> >         $ git grep -e 'ENOSYS' v4.11-rc3 -- Documentation/gpio/
> >         <void>
> 
> It was added by commit 22c403676dbbb7c6 ("gpio: return NULL from
> gpiod_get_optional when GPIOLIB is disabled")

Ah, that's in next.

I still think this is wrong and I'm a bit disappointed that Linus merged
this patch (without saying so in the thread even) as I thought Linus and
I agreed on this being a bad idea.

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |