linux-kernel - Re: [PATCH] slimbus: qcom: fix error check return value of platform_get

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Date:   Tue, 12 Apr 2022 09:29:15 -0500
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     cgel.zte@...il.com
Cc:     agross@...nel.org, srinivas.kandagatla@...aro.org,
        gregkh@...uxfoundation.org, sdharia@...eaurora.org,
        linux-arm-msm@...r.kernel.org, alsa-devel@...a-project.org,
        linux-kernel@...r.kernel.org, Lv Ruyi <lv.ruyi@....com.cn>,
        Zeal Robot <zealci@....com.cn>
Subject: Re: [PATCH] slimbus: qcom: fix error check return value of
 platform_get_irq()

On Tue 12 Apr 04:02 CDT 2022, cgel.zte@...il.com wrote:

> From: Lv Ruyi <lv.ruyi@....com.cn>
> 
> platform_get_irq() return negative value on failure, so null check of
> ctrl->irq is incorrect. Fix it by comparing whether it is less than zero.
> 
> Fixes: ad7fcbc308b0 ("slimbus: qcom: Add Qualcomm Slimbus controller driver")
> Reported-by: Zeal Robot <zealci@....com.cn>
> Signed-off-by: Lv Ruyi <lv.ruyi@....com.cn>

Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>

> ---
>  drivers/slimbus/qcom-ctrl.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/slimbus/qcom-ctrl.c b/drivers/slimbus/qcom-ctrl.c
> index f04b961b96cd..b2f01e155d77 100644
> --- a/drivers/slimbus/qcom-ctrl.c
> +++ b/drivers/slimbus/qcom-ctrl.c
> @@ -510,7 +510,7 @@ static int qcom_slim_probe(struct platform_device *pdev)
>  	}
>  
>  	ctrl->irq = platform_get_irq(pdev, 0);
> -	if (!ctrl->irq) {
> +	if (ctrl->irq < 0) {
>  		dev_err(&pdev->dev, "no slimbus IRQ\n");
>  		return -ENODEV;
>  	}
> -- 
> 2.25.1
>