linux-kernel - Re: [PATCH 06/35] mfd: ab8500-core: Sysfs chip id modification

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Date:	Wed, 20 Feb 2013 09:53:50 +0100
From:	Marcus Cooper <codekipper@...il.com>
To:	Lee Jones <lee.jones@...aro.org>
Cc:	Arnd Bergmann <arnd@...db.de>,
	Marcus Cooper <marcus.xm.cooper@...ricsson.com>,
	linus.walleij@...ricsson.com, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, sameo@...ux.intel.com
Subject: Re: [PATCH 06/35] mfd: ab8500-core: Sysfs chip id modification

On 20 February 2013 09:13, Lee Jones <lee.jones@...aro.org> wrote:
> On Tue, 19 Feb 2013, Arnd Bergmann wrote:
>
>> On Friday 15 February 2013, Lee Jones wrote:
>> >         struct ab8500 *ab8500;
>> > +       int chip_id = -EINVAL;
>> >
>> >         ab8500 = dev_get_drvdata(dev);
>> > -       return sprintf(buf, "%#x\n", ab8500 ? ab8500->chip_id : -EINVAL);
>> > +       if(ab8500) {
>> > +               chip_id = ab8500->chip_id;
>> > +               if((is_ab8505(ab8500) || is_ab9540(ab8500)) && ab8500->version != 0xFF)
>> > +                       chip_id = (ab8500->version << 8) | chip_id;
>> > +       }
>> > +       return sprintf(buf, "%#x\n", chip_id);
>> >  }
>>
>> What's the use of printing "ffffffea" for unknown versions here?
>
> You mean instead of -EINVAL? No idea, Marcus?
>
Looks like I'm guilty of just making the minimal changes. Arnd is
right though, getting ffffffea(-EINVAL) back is pretty useless.
I'll have to check user land to see what is using this. Maybe not
printing and returning 0 should be the correct behaviour
when an unknown version is found.
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