linux-kernel - Re: [PATCH] soc: imx8m: Fix return value check in imx8mq_soc

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Date:   Mon, 28 Nov 2022 08:56:01 +0100
From:   Ahmad Fatoum <a.fatoum@...gutronix.de>
To:     Zheng Yongjun <zhengyongjun3@...wei.com>, shawnguo@...nel.org,
        s.hauer@...gutronix.de, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Cc:     festevam@...il.com, linux-imx@....com, kernel@...gutronix.de
Subject: Re: [PATCH] soc: imx8m: Fix return value check in
 imx8mq_soc_revision()

Hi Zheng,

On 26.11.22 10:24, Zheng Yongjun wrote:
> In case of error, the function of_clk_get_by_name()
> returns ERR_PTR() and never returns NULL. The NULL test in the
> return value check should be replaced with IS_ERR().
> 
> Fixes: 836fb30949d9 ("soc: imx8m: Enable OCOTP clock before reading the register")
> Signed-off-by: Zheng Yongjun <zhengyongjun3@...wei.com>
> ---
>  drivers/soc/imx/soc-imx8m.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/soc/imx/soc-imx8m.c b/drivers/soc/imx/soc-imx8m.c
> index 28144c699b0c..32ed9dc88e45 100644
> --- a/drivers/soc/imx/soc-imx8m.c
> +++ b/drivers/soc/imx/soc-imx8m.c
> @@ -66,8 +66,8 @@ static u32 __init imx8mq_soc_revision(void)
>  	ocotp_base = of_iomap(np, 0);
>  	WARN_ON(!ocotp_base);
>  	clk = of_clk_get_by_name(np, NULL);
> -	if (!clk) {
> -		WARN_ON(!clk);
> +	if (IS_ERR(clk)) {
> +		WARN_ON(IS_ERR(clk));
>  		return 0;

You could also rewrite as

if (WARN_ON(IS_ERR(clk))
	return 0;

To make it more concise. Change looks good though:

Reviewed-by: Ahmad Fatoum <a.fatoum@...gutronix.de>

Cheers,
Ahmad

>  	}
> 
> --
> 2.17.1
> 
> 
> 

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