linux-kernel - Re: [PATCH] leds: leds-gpio: Convert gpio_blink

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Date:	Thu, 6 Nov 2014 12:27:42 +0100
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Mika Westerberg <mika.westerberg@...ux.intel.com>
Cc:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Alexandre Courbot <acourbot@...dia.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Bryan Wu <cooloney@...il.com>,
	Richard Purdie <rpurdie@...ys.net>,
	Ben Dooks <ben-linux@...ff.org>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Jason Cooper <jason@...edaemon.net>,
	Andrew Lunn <andrew@...n.ch>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	Linux-sh list <linux-sh@...r.kernel.org>
Subject: Re: [PATCH] leds: leds-gpio: Convert gpio_blink_set() to use GPIO descriptors

On Thu, Nov 6, 2014 at 12:22 PM, Mika Westerberg
<mika.westerberg@...ux.intel.com> wrote:
> On Thu, Nov 06, 2014 at 12:12:04PM +0100, Geert Uytterhoeven wrote:
>> On Thu, Nov 6, 2014 at 11:58 AM, Mika Westerberg
>> <mika.westerberg@...ux.intel.com> wrote:
>> > On Thu, Nov 06, 2014 at 11:32:19AM +0100, Geert Uytterhoeven wrote:
>> >> On Thu, Nov 6, 2014 at 11:30 AM, Mika Westerberg
>> >> <mika.westerberg@...ux.intel.com> wrote:
>> >> >> "leds: leds-gpio: Add support for GPIO descriptors" broke leds-gpio on
>> >> >> non-DT platforms for me:
>> >> >>
>> >> >>     gpiod_direction_output: invalid GPIO
>> >> >>     leds-gpio: probe of leds-gpio failed with error -22
>> >> >>
>> >> >> (desc is NULL in gpiod_direction_output()).

>>     leds-gpio leds-gpio: GPIO 102, ret: 0
>>     leds-gpio leds-gpio: GPIOD: c050e970
>>
>> So led_dat is non-NULL. But it's overwritten by NULL later:
>>
>>     led_dat->gpiod = template->gpiod;
>
> Ah, that's it. Nice catch!
>
>> Whitespace damaged fix below, to fold into the original.
>> If you prefer a proper separate patch, let me know.
>
> It is up to Rafael. I think he wants to stabilize this branch so in that
> case separate patch on top would work better.

I've already sent a patch, as I have to publish the fix in my git tree anyway.

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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