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Subject: Re: linux-4.20-rc1/sound/soc/stm/stm32_sai_sub.c:343: Faulty error
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To:     David Binderman <dcb314@hotmail.com>,
        Olivier MOYSAN <olivier.moysan@st.com>,
        "lgirdwood@gmail.com" <lgirdwood@gmail.com>,
        "broonie@kernel.org" <broonie@kernel.org>,
        "perex@perex.cz" <perex@perex.cz>,
        "tiwai@suse.com" <tiwai@suse.com>,
        "mcoquelin.stm32@gmail.com" <mcoquelin.stm32@gmail.com>,
        Alexandre TORGUE <alexandre.torgue@st.com>,
        "alsa-devel@alsa-project.org" <alsa-devel@alsa-project.org>,
        "linux-stm32@st-md-mailman.stormreply.com" 
        <linux-stm32@st-md-mailman.stormreply.com>,
        "linux-arm-kernel@lists.infradead.org" 
        <linux-arm-kernel@lists.infradead.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
References: <VI1PR08MB3342060AF73044939F5273F59CCA0@VI1PR08MB3342.eurprd08.prod.outlook.com>
From:   Arnaud Pouliquen <arnaud.pouliquen@st.com>
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Date:   Mon, 5 Nov 2018 15:24:09 +0100
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Hello David,

On 11/5/18 2:33 PM, David Binderman wrote:
> Hello there,
> 
> linux-4.20-rc1/sound/soc/stm/stm32_sai_sub.c:343]: (style) Checking if
> unsigned variable 'div' is less than zero.
> 
> Source code is
> 
>         div = stm32_sai_get_clk_div(sai, parent_rate, rate);
>         if (div < 0)
>                 return div;
> 
> Suggest store return value from function in int local variable, test it
> and only then assign it into an unsigned variable.
> 
> Regards
> 
> David Binderman

Thanks for your feedback, a patch has already been sent and applied to
fix this warning: https://lkml.org/lkml/2018/11/5/510.

Regards,
Arnaud