linux-kernel - Re: [PATCH v2 2/7] iommu/exynos: Handle failed IOMMU device registration properly

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Date:   Tue, 12 Jul 2022 17:40:24 +0200
From:   Marek Szyprowski <m.szyprowski@...sung.com>
To:     Sam Protsenko <semen.protsenko@...aro.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Janghyuck Kim <janghyuck.kim@...sung.com>,
        Cho KyongHo <pullip.cho@...sung.com>,
        Daniel Mentz <danielmentz@...gle.com>,
        David Virag <virag.david003@...il.com>,
        Sumit Semwal <sumit.semwal@...aro.org>, iommu@...ts.linux.dev,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/7] iommu/exynos: Handle failed IOMMU device
 registration properly


On 11.07.2022 01:05, Sam Protsenko wrote:
> If iommu_device_register() fails in exynos_sysmmu_probe(), the previous
> calls have to be cleaned up. In this case, the iommu_device_sysfs_add()
> should be cleaned up, by calling its remove counterpart call.
>
> Signed-off-by: Sam Protsenko <semen.protsenko@...aro.org>
Acked-by: Marek Szyprowski <m.szyprowski@...sung.com>
> ---
> Changes in v2:
>    - (none) This patch is new and added in v2
>
>   drivers/iommu/exynos-iommu.c | 6 +++++-
>   1 file changed, 5 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c
> index 8f80aaa35092..c85db9dab851 100644
> --- a/drivers/iommu/exynos-iommu.c
> +++ b/drivers/iommu/exynos-iommu.c
> @@ -629,7 +629,7 @@ static int exynos_sysmmu_probe(struct platform_device *pdev)
>   
>   	ret = iommu_device_register(&data->iommu, &exynos_iommu_ops, dev);
>   	if (ret)
> -		return ret;
> +		goto err_iommu_register;
>   
>   	platform_set_drvdata(pdev, data);
>   
> @@ -656,6 +656,10 @@ static int exynos_sysmmu_probe(struct platform_device *pdev)
>   	pm_runtime_enable(dev);
>   
>   	return 0;
> +
> +err_iommu_register:
> +	iommu_device_sysfs_remove(&data->iommu);
> +	return ret;
>   }
>   
>   static int __maybe_unused exynos_sysmmu_suspend(struct device *dev)

Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland