linux-kernel - Re: [2.6.19 PATCH 4/7] ehea: ethtool interface

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Date:	Sat, 19 Aug 2006 16:18:24 +1000
From:	Michael Ellerman <michael@...erman.id.au>
To:	Thomas Klein <osstklei@...ibm.com>
Cc:	Alexey Dobriyan <adobriyan@...il.com>,
	Thomas Klein <tklein@...ibm.com>,
	Jan-Bernd Themann <themann@...ibm.com>, netdev@...r.kernel.org,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Christoph Raisch <raisch@...ibm.com>,
	linux-ppc <linuxppc-dev@...abs.org>,
	Marcus Eder <meder@...ibm.com>
Subject: Re: [2.6.19 PATCH 4/7] ehea: ethtool interface

On Fri, 2006-08-18 at 17:41 +0200, Thomas Klein wrote:
> Hi Alexey,
> 
> first of all thanks a lot for the extensive review.
> 
> 
> Alexey Dobriyan wrote:
> >> +	u64 hret = H_HARDWARE;
> > 
> > Useless assignment here and everywhere.
> > 
> 
> Initializing returncodes to errorstate is a cheap way to prevent
> accidentally returning (uninitalized) success returncodes which
> can lead to catastrophic misbehaviour.

If you try to return an uninitialized value the compiler will warn you,
you'll then look at the code and realise you missed a case, you might
save yourself a bug. By unconditionally initialising you are lying to
the compiler, and it can no longer help you.

cheers

-- 
Michael Ellerman
IBM OzLabs

wwweb: http://michael.ellerman.id.au
phone: +61 2 6212 1183 (tie line 70 21183)

We do not inherit the earth from our ancestors,
we borrow it from our children. - S.M.A.R.T Person

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