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Date: Mon, 20 Mar 2017 11:38:52 +0100 From: Geert Uytterhoeven <geert@...ux-m68k.org> To: Uwe Kleine-König <u.kleine-koenig@...gutronix.de> 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 Hi Uwe, 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") Gr{oetje,eeting}s, Geert -- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org In personal conversations with technical people, I call myself a hacker. But when I'm talking to journalists I just say "programmer" or something like that. -- Linus Torvalds
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