linux-kernel - Re: [PATCH next] usb: dwc3: qcom: Fix error handling in probe

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Message-ID: <20250424233158.vgegsvpuiwm6j6a4@synopsys.com>
Date: Thu, 24 Apr 2025 23:32:02 +0000
From: Thinh Nguyen <Thinh.Nguyen@...opsys.com>
To: Dan Carpenter <dan.carpenter@...aro.org>
CC: Bjorn Andersson <bjorn.andersson@....qualcomm.com>,
        Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>
Subject: Re: [PATCH next] usb: dwc3: qcom: Fix error handling in probe

On Wed, Apr 23, 2025, Dan Carpenter wrote:
> There are two issues:
> 1) Return -EINVAL if platform_get_resource() fails.  Don't return
>    success.
> 2) The devm_ioremap() function doesn't return error pointers, it returns
>    NULL.  Update the check.
> 
> Fixes: 1881a32fe14d ("usb: dwc3: qcom: Transition to flattened model")
> Signed-off-by: Dan Carpenter <dan.carpenter@...aro.org>
> ---
>  drivers/usb/dwc3/dwc3-qcom.c | 10 ++++++----
>  1 file changed, 6 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/usb/dwc3/dwc3-qcom.c b/drivers/usb/dwc3/dwc3-qcom.c
> index d512002e1e88..b63fcaf823aa 100644
> --- a/drivers/usb/dwc3/dwc3-qcom.c
> +++ b/drivers/usb/dwc3/dwc3-qcom.c
> @@ -740,15 +740,17 @@ static int dwc3_qcom_probe(struct platform_device *pdev)
>  	}
>  
>  	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> -	if (!r)
> +	if (!r) {
> +		ret = -EINVAL;
>  		goto clk_disable;
> +	}
>  	res = *r;
>  	res.end = res.start + SDM845_QSCRATCH_BASE_OFFSET;
>  
>  	qcom->qscratch_base = devm_ioremap(dev, res.end, SDM845_QSCRATCH_SIZE);
> -	if (IS_ERR(qcom->qscratch_base)) {
> -		dev_err(dev, "failed to map qscratch region: %pe\n", qcom->qscratch_base);
> -		ret = PTR_ERR(qcom->qscratch_base);
> +	if (!qcom->qscratch_base) {
> +		dev_err(dev, "failed to map qscratch region\n");
> +		ret = -ENOMEM;
>  		goto clk_disable;
>  	}
>  
> -- 
> 2.47.2
> 

Acked-by: Thinh Nguyen <Thinh.Nguyen@...opsys.com>

Thanks,
Thinh