linux-kernel - Re: [PATCH] iommu/qcom:fix local

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Date:   Thu, 16 Apr 2020 11:05:26 +0100
From:   Robin Murphy <robin.murphy@....com>
To:     Tang Bin <tangbin@...s.chinamobile.com>, agross@...nel.org,
        bjorn.andersson@...aro.org, robdclark@...il.com
Cc:     linux-arm-msm@...r.kernel.org, iommu@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] iommu/qcom:fix local_base status check

On 2020-04-02 7:33 am, Tang Bin wrote:
> Release resources when exiting on error.
> 
> Signed-off-by: Tang Bin <tangbin@...s.chinamobile.com>
> ---
>   drivers/iommu/qcom_iommu.c | 5 ++++-
>   1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/iommu/qcom_iommu.c b/drivers/iommu/qcom_iommu.c
> index 4328da0b0..c08aa9651 100644
> --- a/drivers/iommu/qcom_iommu.c
> +++ b/drivers/iommu/qcom_iommu.c
> @@ -813,8 +813,11 @@ static int qcom_iommu_device_probe(struct platform_device *pdev)
>   	qcom_iommu->dev = dev;
>   
>   	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> -	if (res)
> +	if (res) {
>   		qcom_iommu->local_base = devm_ioremap_resource(dev, res);
> +		if (IS_ERR(qcom_iommu->local_base))
> +			return PTR_ERR(qcom_iommu->local_base);
> +	}

...or just use devm_platform_ioremap_resource() to make the whole thing 
simpler.

Robin.

>   
>   	qcom_iommu->iface_clk = devm_clk_get(dev, "iface");
>   	if (IS_ERR(qcom_iommu->iface_clk)) {
>