linux-kernel - Re: [PATCH] SYSFS: Fix return values for sysdev_store

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Message-ID: <20081017062533.GZ12131@one.firstfloor.org>
Date:	Fri, 17 Oct 2008 08:25:33 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Andi Kleen <andi@...stfloor.org>, greg@...ah.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] SYSFS: Fix return values for sysdev_store_{ulong,int}

On Thu, Oct 16, 2008 at 01:35:30PM -0700, Andrew Morton wrote:
> On Mon, 13 Oct 2008 12:03:03 +0200
> Andi Kleen <andi@...stfloor.org> wrote:
> 
> > SYSFS: Fix return values for sysdev_store_{ulong,int}
> > 
> > Always return the full size instead of the consumed
> > length of the string in sysdev_store_{ulong,int}
> > 
> > This avoids EINVAL errors in some echo versions.
> 
> That sounds fairly serious.  Is this a regression or are those versions
> of echo really ancient, or...?

It's a regression, but it currently only affects the mce sysfs files,
which are the only ones using it. Also the EINVAL is more a cosmetic
issue because the first write will already change the value successfully,
only the second one will fail but not change anything.

-Andi

-- 
ak@...ux.intel.com
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