linux-kernel - Re: [PATCH][next] gpio: loongson-64bit: Fix a less than zero check on an unsigned int struct field

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Message-ID: <aMDr8pX7MLfIRJny@pie>
Date: Wed, 10 Sep 2025 03:09:38 +0000
From: Yao Zi <ziyao@...root.org>
To: Colin Ian King <colin.i.king@...il.com>,
	Yinbo Zhu <zhuyinbo@...ngson.cn>,
	Linus Walleij <linus.walleij@...aro.org>,
	Bartosz Golaszewski <brgl@...ev.pl>,
	Huacai Chen <chenhuacai@...nel.org>, linux-gpio@...r.kernel.org
Cc: kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH][next] gpio: loongson-64bit: Fix a less than zero check
 on an unsigned int struct field

On Tue, Sep 09, 2025 at 08:03:56PM +0100, Colin Ian King wrote:
> Currently the error check from the call to platform_get_irq is always
> false because an unsigned int chip->irq.parents[i] is being used to
> to perform the less than zero error check. Fix this by using the int
> variable ret to perform the check.
> 
> Fixes: 03c146cb6cd1 ("gpio: loongson-64bit: Add support for Loongson-2K0300 SoC")
> Signed-off-by: Colin Ian King <colin.i.king@...il.com>
> ---
>  drivers/gpio/gpio-loongson-64bit.c | 9 ++++++---
>  1 file changed, 6 insertions(+), 3 deletions(-)

Thanks for catching this,

Reviewed-by: Yao Zi <ziyao@...root.org>

> diff --git a/drivers/gpio/gpio-loongson-64bit.c b/drivers/gpio/gpio-loongson-64bit.c
> index f84f8c537249..24b7219db34a 100644
> --- a/drivers/gpio/gpio-loongson-64bit.c
> +++ b/drivers/gpio/gpio-loongson-64bit.c
> @@ -267,10 +267,13 @@ static int loongson_gpio_init_irqchip(struct platform_device *pdev,
>  		return -ENOMEM;
>  
>  	for (i = 0; i < data->intr_num; i++) {
> -		chip->irq.parents[i] = platform_get_irq(pdev, i);
> -		if (chip->irq.parents[i] < 0)
> -			return dev_err_probe(&pdev->dev, chip->irq.parents[i],
> +		int ret;
> +
> +		ret = platform_get_irq(pdev, i);
> +		if (ret < 0)
> +			return dev_err_probe(&pdev->dev, ret,
>  					     "failed to get IRQ %d\n", i);
> +		chip->irq.parents[i] = ret;
>  	}
>  
>  	for (i = 0; i < data->intr_num; i++) {
> -- 
> 2.51.0
>