linux-kernel - Re: [PATCH] ASoC: cs35l56: Fix an unsigned comparison which can never be negative

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Date:   Fri, 24 Mar 2023 10:29:15 +0000
From:   Richard Fitzgerald <rf@...nsource.cirrus.com>
To:     Jiapeng Chong <jiapeng.chong@...ux.alibaba.com>,
        <broonie@...nel.org>
CC:     <perex@...ex.cz>, <tiwai@...e.com>, <alsa-devel@...a-project.org>,
        <patches@...nsource.cirrus.com>, <linux-kernel@...r.kernel.org>,
        Abaci Robot <abaci@...ux.alibaba.com>
Subject: Re: [PATCH] ASoC: cs35l56: Fix an unsigned comparison which can never
 be negative

On 24/03/2023 02:23, Jiapeng Chong wrote:
> The variable 'rv' is defined as unsigned type, so the following if
> statement is invalid, we can modify the type of rv to int.
> if (rv < 0) {
> 	dev_err(cs35l56->dev, "irq: failed to get pm_runtime:
> 		%d\n", rv);
> 	goto err_unlock;
> }
> 
> ./sound/soc/codecs/cs35l56.c:333:5-7: WARNING: Unsigned expression compared with zero: rv < 0.
> 
> Reported-by: Abaci Robot <abaci@...ux.alibaba.com>
> Link: https://bugzilla.openanolis.cn/show_bug.cgi?id=4599
> Signed-off-by: Jiapeng Chong <jiapeng.chong@...ux.alibaba.com>
> ---
>   sound/soc/codecs/cs35l56.c | 4 +++-
>   1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/sound/soc/codecs/cs35l56.c b/sound/soc/codecs/cs35l56.c
> index 90fc79b5666d..d97b465f0d3c 100644
> --- a/sound/soc/codecs/cs35l56.c
> +++ b/sound/soc/codecs/cs35l56.c
> @@ -321,7 +321,9 @@ irqreturn_t cs35l56_irq(int irq, void *data)
>   	struct cs35l56_private *cs35l56 = data;
>   	unsigned int status1 = 0, status8 = 0, status20 = 0;
>   	unsigned int mask1, mask8, mask20;
> -	unsigned int rv, val;
> +	unsigned int val;
> +	int rv;
> +
>   	irqreturn_t ret = IRQ_NONE;
>   
>   	if (!cs35l56->init_done)

Reviewed-by: Richard Fitzgerald <rf@...nsource.cirrus.com>