linux-kernel - Re: [PATCH RESEND] gpio: lpc32xx: Handle devm_gpiochip_add

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Date:   Fri, 3 Dec 2021 09:56:37 +0200
From:   Vladimir Zapolskiy <vz@...ia.com>
To:     Jiasheng Jiang <jiasheng@...as.ac.cn>, linus.walleij@...aro.org,
        bgolaszewski@...libre.com
Cc:     linux-gpio@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH RESEND] gpio: lpc32xx: Handle devm_gpiochip_add_data error
 codes

On 12/3/21 9:49 AM, Jiasheng Jiang wrote:
> The return value of devm_gpiochip_add_data() is not always 0.
> To catch the exception in case of the failure.
> 
> Fixes: 69c0a0a52cde ("gpio: lpc32xx: Use devm_gpiochip_add_data() for gpio registration")
> Signed-off-by: Jiasheng Jiang <jiasheng@...as.ac.cn>
> ---
>   drivers/gpio/gpio-lpc32xx.c | 5 ++++-
>   1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpio/gpio-lpc32xx.c b/drivers/gpio/gpio-lpc32xx.c
> index 4e626c4235c2..e3b734302b76 100644
> --- a/drivers/gpio/gpio-lpc32xx.c
> +++ b/drivers/gpio/gpio-lpc32xx.c
> @@ -505,6 +505,7 @@ static int lpc32xx_of_xlate(struct gpio_chip *gc,
>   static int lpc32xx_gpio_probe(struct platform_device *pdev)
>   {
>   	int i;
> +	int err;

This was missed in v1, so formally it is not a resend, but a v2 change.

>   	void __iomem *reg_base;
>   
>   	reg_base = devm_platform_ioremap_resource(pdev, 0);
> @@ -518,8 +519,10 @@ static int lpc32xx_gpio_probe(struct platform_device *pdev)
>   			lpc32xx_gpiochip[i].chip.of_node = pdev->dev.of_node;
>   			lpc32xx_gpiochip[i].reg_base = reg_base;
>   		}
> -		devm_gpiochip_add_data(&pdev->dev, &lpc32xx_gpiochip[i].chip,
> +		err = devm_gpiochip_add_data(&pdev->dev, &lpc32xx_gpiochip[i].chip,
>   				  &lpc32xx_gpiochip[i]);
> +		if (err)
> +			return err;
>   	}
>   
>   	return 0;
> 

Thank you for the fix.

Acked-by: Vladimir Zapolskiy <vz@...ia.com>

--
Best wishes,
Vladimir