linux-kernel - Re: [PATCH] ASoC: nau8825: fix bounds check for adc

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Date:   Tue, 18 Apr 2023 20:23:33 +0800
From:   AS50 CTLin0 <ctlin0@...oton.com>
To:     Tom Rix <trix@...hat.com>, lgirdwood@...il.com, broonie@...nel.org,
        perex@...ex.cz, tiwai@...e.com, nathan@...nel.org,
        ndesaulniers@...gle.com, luca.ceresoli@...tlin.com,
        peda@...ntia.se, javierm@...hat.com,
        u.kleine-koenig@...gutronix.de, ckeepax@...nsource.cirrus.com
Cc:     alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
        llvm@...ts.linux.dev
Subject: Re: [PATCH] ASoC: nau8825: fix bounds check for adc_delay

On 4/18/2023 8:09 PM, Tom Rix wrote:
> clang build reports
> sound/soc/codecs/nau8825.c:2826:31: error: overlapping comparisons
>    always evaluate to false [-Werror,-Wtautological-overlap-compare]
>          if (nau8825->adc_delay < 125 && nau8825->adc_delay > 500)
>              ~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
>
> This is a bug, a logical-or should have been used.
>
> Fixes: fc0b096c9291 ("ASoC: nau8825: Add delay control for input path")
> Signed-off-by: Tom Rix <trix@...hat.com>
> ---
>   sound/soc/codecs/nau8825.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/sound/soc/codecs/nau8825.c b/sound/soc/codecs/nau8825.c
> index c4389f5fe603..f4eb999761a4 100644
> --- a/sound/soc/codecs/nau8825.c
> +++ b/sound/soc/codecs/nau8825.c
> @@ -2823,7 +2823,7 @@ static int nau8825_read_device_properties(struct device *dev,
>       ret = device_property_read_u32(dev, "nuvoton,adc-delay-ms", &nau8825->adc_delay);
>       if (ret)
>               nau8825->adc_delay = 125;
> -     if (nau8825->adc_delay < 125 && nau8825->adc_delay > 500)
> +     if (nau8825->adc_delay < 125 || nau8825->adc_delay > 500)
>               dev_warn(dev, "Please set the suitable delay time!\n");
>
>       nau8825->mclk = devm_clk_get(dev, "mclk");

Sorry, it is my fault. You are right.

Acked-by: David Lin <CTLIN0@...oton.com>

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