linux-kernel - Re: [PATCH] thermal: Fix for setting the thermal zone mode to enable/disable

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Message-ID: <20120321162757.527f87e2@endymion.delvare>
Date:	Wed, 21 Mar 2012 16:27:57 +0100
From:	Jean Delvare <khali@...ux-fr.org>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:	Amit Daniel Kachhap <amit.kachhap@...aro.org>,
	linux-pm@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
	linux-acpi@...r.kernel.org, lenb@...nel.org,
	linaro-dev@...ts.linaro.org, patches@...aro.org
Subject: Re: [PATCH] thermal: Fix for setting the thermal zone mode to
 enable/disable

On Wed, 21 Mar 2012 16:14:46 +0100, Geert Uytterhoeven wrote:
> On Wed, Mar 21, 2012 at 15:13, Jean Delvare <khali@...ux-fr.org> wrote:
> > On Wed, 21 Mar 2012 16:40:01 +0530, Amit Daniel Kachhap wrote:
> >> Basically without this patch changing the mode of thermal zone
> >> is not possible as wrong string size is passed to strncmp.
> >
> > Actually it is possible,
> > $ echo -n disabled > mode
> > works fine. But it fails without the -n, your patch would fix that.
> 
> Now it ignores any extra characters. Are they always newlines?
> 
> Now "echo -n disabledx > mode" will also "succeed".

I guess this is considered good enough in practice, although I also
don't like this use of strncmp. I'd prefer \n to be properly converted
to \0 (by the sysfs layer itself) so that strict string comparisons can
be done. I don't have the time to push this though, sorry.

-- 
Jean Delvare
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