linux-kernel - Re: [PATCH] gpio: pca953x: initialize ret to zero to avoid returning garbage

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Date:   Tue, 13 Sep 2016 14:31:29 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Phil Reid <preid@...ctromag.com.au>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Colin King <colin.king@...onical.com>,
        Alexandre Courbot <gnurou@...il.com>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] gpio: pca953x: initialize ret to zero to avoid returning garbage

On Tuesday, September 13, 2016 12:04:00 PM CEST Phil Reid wrote:
> On 12/09/2016 21:40, Linus Walleij wrote:
> > On Fri, Sep 9, 2016 at 10:31 AM, Colin King <colin.king@...onical.com> wrote:
> >
> >> From: Colin Ian King <colin.king@...onical.com>
> >>
> >> ret is not initialized so it contains garbage.  Ensure garbage
> >> is not returned in the case that pdata && pdata->teardown is false
> >> by initializing ret to 0.
> >>
> >> Signed-off-by: Colin Ian King <colin.king@...onical.com>
> >
> > Patch applied.
> G'day Linus,
> 
> 
> I believe this does the same as Arnd Bergmanns patch from 26 Aug.
> [PATCH 1/5] gpio: pca954x: fix undefined error code from remove
> 
> IMO Colin's is the cleaner solution.
> Arnd's could be removed.
> 

Please try to avoid adding initializations in the local variable
declaration, they just hide otherwise useful warnings when
you get a function that actually does something incorrect
in some code paths.

See also https://rusty.ozlabs.org/?p=232

	Arnd