答复: [PATCH] soc: imx8m: Fix return value check in imx8mq_soc_revision()

From: zhengyongjun
Date: Mon Nov 28 2022 - 03:41:48 EST


Thanks for your adivice :)

Zheng

-----邮件原件-----
发件人: Ahmad Fatoum [mailto:a.fatoum@xxxxxxxxxxxxxx]
发送时间: 2022年11月28日 15:56
收件人: zhengyongjun <zhengyongjun3@xxxxxxxxxx>; shawnguo@xxxxxxxxxx; s.hauer@xxxxxxxxxxxxxx; linux-arm-kernel@xxxxxxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx
抄送: festevam@xxxxxxxxx; linux-imx@xxxxxxx; kernel@xxxxxxxxxxxxxx
主题: 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@xxxxxxxxxx>
> ---
> 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@xxxxxxxxxxxxxx>

Cheers,
Ahmad

> }
>
> --
> 2.17.1
>
>
>

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