linux-kernel - Re: [PATCH] ASoC: wm8962: potential use of error pointer

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Date:   Fri, 17 Dec 2021 10:42:46 +0100
From:   Cezary Rojewski <cezary.rojewski@...el.com>
To:     Jiasheng Jiang <jiasheng@...as.ac.cn>, <lgirdwood@...il.com>,
        <broonie@...nel.org>, <perex@...ex.cz>, <tiwai@...e.com>,
        <kuninori.morimoto.gx@...esas.com>, <shengjiu.wang@....com>,
        <daniel.baluta@....com>
CC:     <patches@...nsource.cirrus.com>, <alsa-devel@...a-project.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ASoC: wm8962: potential use of error pointer

On 2021-12-17 4:13 AM, Jiasheng Jiang wrote:
> The return value of devm_clk_get() needs to be checked.
> To avoid use of error pointer in case of the failure of alloc.
> 
> Fixes: d74e9e7090ae ("ASoC: wm8962: Add device tree binding")
> Signed-off-by: Jiasheng Jiang <jiasheng@...as.ac.cn>
> ---
>   sound/soc/codecs/wm8962.c | 2 ++
>   1 file changed, 2 insertions(+)
> 
> diff --git a/sound/soc/codecs/wm8962.c b/sound/soc/codecs/wm8962.c
> index 34080f497584..66693bf17763 100644
> --- a/sound/soc/codecs/wm8962.c
> +++ b/sound/soc/codecs/wm8962.c
> @@ -3540,6 +3540,8 @@ static int wm8962_set_pdata_from_of(struct i2c_client *i2c,
>   		}
>   
>   	pdata->mclk = devm_clk_get(&i2c->dev, NULL);
> +	if (IS_ERR(pdata->mclk))
> +		return -ENOMEM;
>   
>   	return 0;
>   }
> 

Correct me if I'm wrong, but -ENOMEM is not the only error code that 
could get returned by clk_get() (which is internally called by 
devm_clk_get()). Is there a specific reason for ignoring the return value?


Regards,
Czarek