linux-kernel - Re: [PATCH -next v2] mfd: pm8008: Fix return value check in pm8008

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Date:   Fri, 4 Jun 2021 10:50:57 -0700
From:   Guru Das Srinagesh <gurus@...eaurora.org>
To:     Yang Yingliang <yangyingliang@...wei.com>
Cc:     linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        lee.jones@...aro.org, agross@...nel.org,
        dmitry.baryshkov@...aro.org
Subject: Re: [PATCH -next v2] mfd: pm8008: Fix return value check in
 pm8008_probe()

On Fri, Jun 04, 2021 at 09:38:24AM +0800, Yang Yingliang wrote:
> In case of error, the function devm_regmap_init_i2c() returns ERR_PTR()
> and never returns NULL. The NULL test in the return value check
> should be replaced with IS_ERR().
> 
> Fixes: 6b149f3310a4 ("mfd: pm8008: Add driver for QCOM PM8008 PMIC")
> Reported-by: Hulk Robot <hulkci@...wei.com>
> Signed-off-by: Yang Yingliang <yangyingliang@...wei.com>
> ---
> v2:
>   make the change correspond to the changelog
> ---
>  drivers/mfd/qcom-pm8008.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/mfd/qcom-pm8008.c b/drivers/mfd/qcom-pm8008.c
> index c472d7f8103c..476171455d32 100644
> --- a/drivers/mfd/qcom-pm8008.c
> +++ b/drivers/mfd/qcom-pm8008.c
> @@ -228,7 +228,7 @@ static int pm8008_probe(struct i2c_client *client)
>  
>  	chip->dev = &client->dev;
>  	chip->regmap = devm_regmap_init_i2c(client, &qcom_mfd_regmap_cfg);
> -	if (!chip->regmap)
> +	if (IS_ERR(chip->regmap))
>  		return -ENODEV;

The error received from devm_regmap_init_i2c should be returned as-is and not
-ENODEV. Could you please do:

	if (IS_ERR(chip->regmap))
		return PTR_ERR(chip->regmap);

Thank you for this patch.

>  
>  	i2c_set_clientdata(client, chip);