linux-kernel - Re: [PATCH] iio: adc: gyroadc: fix uninitialized return code

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Message-ID: <20190704120756.GA1582@kunai>
Date:   Thu, 4 Jul 2019 14:07:56 +0200
From:   Wolfram Sang <wsa@...-dreams.de>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Marek Vasut <marek.vasut@...il.com>,
        Jonathan Cameron <jic23@...nel.org>, stable@...r.kernel.org,
        Marek Vasut <marek.vasut+renesas@...il.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Simon Horman <horms+renesas@...ge.net.au>,
        linux-renesas-soc@...r.kernel.org,
        Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        Rob Herring <robh@...nel.org>,
        Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>,
        linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] iio: adc: gyroadc: fix uninitialized return code

On Thu, Jul 04, 2019 at 01:37:47PM +0200, Arnd Bergmann wrote:
> gcc-9 complains about a blatant uninitialized variable use that
> all earlier compiler versions missed:
> 
> drivers/iio/adc/rcar-gyroadc.c:510:5: warning: 'ret' may be used uninitialized in this function [-Wmaybe-uninitialized]
> 
> Return -EINVAL instead here.
> 
> Cc: stable@...r.kernel.org
> Fixes: 059c53b32329 ("iio: adc: Add Renesas GyroADC driver")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

This is correct but missing that the above 'return ret' is broken, too.
ret is initialized but 0 in that case.

And maybe we can use something else than -EINVAL for this case? I am on
the go right now, I will look for a suggestion later.


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