linux-kernel - Re: [PATCH 10/13] eeepc-laptop: compare proper return values in get

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Date:	Tue, 16 Sep 2014 13:54:25 +0200
From:	Frans Klaver <fransklaver@...il.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	Darren Hart <dvhart@...radead.org>,
	Corentin Chary <corentin.chary@...il.com>,
	Rafael Wysocki <rafael.j.wysocki@...el.com>,
	acpi4asus-user <acpi4asus-user@...ts.sourceforge.net>,
	platform-driver-x86 <platform-driver-x86@...r.kernel.org>,
	linux-kernel@...r.kernel.org,
	linux-acpi <linux-acpi@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...ux.intel.com>
Subject: Re: [PATCH 10/13] eeepc-laptop: compare proper return values in get_cpufv

On Mon, Sep 15, 2014 at 11:55 PM, Frans Klaver <fransklaver@...il.com> wrote:
> On Mon, Sep 15, 2014 at 02:51:25PM -0700, Greg Kroah-Hartman wrote:
>> On Mon, Sep 15, 2014 at 02:49:02PM -0700, Darren Hart wrote:
>> >
>> > This patch is fine as is. However, Greg has supported propogating the error code
>> > through to the sysfs interface (if I understand him correctly on an earlier post
>> > to this list). This would require an addition change to this patch would
>> > propogated the get_cpufv error code in show_available_cpuv(), show_cpuv(), and
>> > store_cpuv(). As it is, we return -ENODEV on any failure, where an ACPI call
>> > error should probably return -ENXIO as I understand it.
>>
>> I really have no idea at this point in time what to recommend.  How
>> about just stick with what is happening today so that:
>>
>> > However, there was a rather famous change in error code handling in which pulse
>> > audio broke and Linus was very upset with one of his maintainers.
>>
>> That doesn't happen :)
>
> So if I interpret that correctly, we're dropping the last patch
> (ENODEV -> ENXIO) from the series? That's fine by me. As mentioned
> earlier, I already saw something else break because I returned ENXIO
> instead of ENODEV.
>
> Maybe it's a good idea to try and document the expected behavior
> somewhere, if even Greg isn't sure what to do.

For good measure:

v2 will not change the return values at the sysfs interface, meaning
we will always return -ENODEV on error. I am going to try to keep as
much internal functions propagating errors as possible though, unless
someone strongly disagrees.

Thanks,
Frans
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