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Date:   Fri, 2 Nov 2018 16:01:39 +0000
From:   Charles Keepax <ckeepax@opensource.cirrus.com>
To:     Arnd Bergmann <arnd@arndb.de>
CC:     Liam Girdwood <lgirdwood@gmail.com>,
        Mark Brown <broonie@kernel.org>,
        Jaroslav Kysela <perex@perex.cz>,
        Takashi Iwai <tiwai@suse.com>,
        "Robert Jarzmik" <robert.jarzmik@free.fr>,
        Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>,
        Marcel Ziswiler <marcel.ziswiler@toradex.com>,
        Fabio Estevam <fabio.estevam@nxp.com>,
        <alsa-devel@alsa-project.org>, <linux-kernel@vger.kernel.org>,
        <patches@opensource.cirrus.com>
Subject: Re: [PATCH] [v2] ASoC: wm97xx: fix uninitialized regmap pointer
 problem
Message-ID: <20181102160139.GQ16508@imbe.wolfsonmicro.main>
References: <20181102151922.889131-1-arnd@arndb.de>
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On Fri, Nov 02, 2018 at 04:18:21PM +0100, Arnd Bergmann wrote:
> gcc notices that without either the ac97 bus or the pdata, we never
> initialize the regmap pointer, which leads to an uninitialized variable
> access:
> 
> sound/soc/codecs/wm9712.c: In function 'wm9712_soc_probe':
> sound/soc/codecs/wm9712.c:666:2: error: 'regmap' may be used uninitialized in this function [-Werror=maybe-uninitialized]
> 
> Since that configuration is invalid, it's better to return an error
> here. I tried to avoid adding complexity to the conditions, and turned
> the #ifdef into a regular if(IS_ENABLED()) check for readability.
> This in turn requires moving some header file declarations out of
> an #ifdef.
> 
> The same code is used in three drivers, all of which I'm changing
> the same way.
> 
> Fixes: 2ed1a8e0ce8d ("ASoC: wm9712: add ac97 new bus support")
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> ---

Acked-by: Charles Keepax <ckeepax@opensource.cirrus.com>

Thanks,
Charles