linux-kernel - Re: [PATCH] ASoC: codec: wm9860: avoid maybe-uninitialized warning

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Message-ID: <20170420090734.GA1594@localhost.localdomain>
Date:   Thu, 20 Apr 2017 10:07:34 +0100
From:   Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
To:     Arnd Bergmann <arnd@...db.de>
CC:     Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Daniel Baluta <daniel.baluta@....com>,
        <patches@...nsource.wolfsonmicro.com>,
        <alsa-devel@...a-project.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ASoC: codec: wm9860: avoid maybe-uninitialized warning

On Wed, Apr 19, 2017 at 07:04:20PM +0200, Arnd Bergmann wrote:
> The new PLL configuration code triggers a harmless warning:
> 
> sound/soc/codecs/wm8960.c: In function 'wm8960_configure_clocking':
> sound/soc/codecs/wm8960.c:735:3: error: 'best_freq_out' may be used uninitialized in this function [-Werror=maybe-uninitialized]
>    wm8960_set_pll(codec, freq_in, best_freq_out);
>    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> sound/soc/codecs/wm8960.c:699:12: note: 'best_freq_out' was declared here
> 
> I think the warning was introduced by Daniel's bugfix. I've come up
> with a way to simplify the code in a way that is more readable to
> both humans and to gcc, which gets us rid of the warning.
> 
> Fixes: 84fdc00d519f ("ASoC: codec: wm9860: Refactor PLL out freq search")
> Fixes: 303e8954af8d ("ASoC: codec: wm8960: Stop when a matching PLL freq is found")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---

Acked-by: Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>

Thanks,
Charles