linux-kernel - Re: [PATCH] iommu/qcom: Cleanup resources in case of probe error path

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Message-ID: <20210608092958.GA8935@willie-the-truck>
Date:   Tue, 8 Jun 2021 10:29:58 +0100
From:   Will Deacon <will@...nel.org>
To:     Amey Narkhede <ameynarkhede03@...il.com>
Cc:     Rob Clark <robdclark@...il.com>,
        Robin Murphy <robin.murphy@....com>,
        Joerg Roedel <joro@...tes.org>,
        iommu@...ts.linux-foundation.org, linux-arm-msm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] iommu/qcom: Cleanup resources in case of probe error path

On Thu, Apr 22, 2021 at 03:40:30AM +0530, Amey Narkhede wrote:
> If device registration fails, remove sysfs attribute
> and if setting bus callbacks fails, unregister the device
> and cleanup the sysfs attribute.
> 
> Signed-off-by: Amey Narkhede <ameynarkhede03@...il.com>
> ---
>  drivers/iommu/arm/arm-smmu/qcom_iommu.c | 14 ++++++++++++--
>  1 file changed, 12 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/iommu/arm/arm-smmu/qcom_iommu.c b/drivers/iommu/arm/arm-smmu/qcom_iommu.c
> index 4294abe389b2..5fa128a1f7f0 100644
> --- a/drivers/iommu/arm/arm-smmu/qcom_iommu.c
> +++ b/drivers/iommu/arm/arm-smmu/qcom_iommu.c
> @@ -850,10 +850,12 @@ static int qcom_iommu_device_probe(struct platform_device *pdev)
>  	ret = iommu_device_register(&qcom_iommu->iommu, &qcom_iommu_ops, dev);
>  	if (ret) {
>  		dev_err(dev, "Failed to register iommu\n");
> -		return ret;
> +		goto err_sysfs_remove;
>  	}
> 
> -	bus_set_iommu(&platform_bus_type, &qcom_iommu_ops);
> +	ret = bus_set_iommu(&platform_bus_type, &qcom_iommu_ops);
> +	if (ret)
> +		goto err_unregister_device;
> 
>  	if (qcom_iommu->local_base) {
>  		pm_runtime_get_sync(dev);
> @@ -862,6 +864,14 @@ static int qcom_iommu_device_probe(struct platform_device *pdev)
>  	}
> 
>  	return 0;
> +
> +err_unregister_device:
> +	iommu_device_unregister(&qcom_iommu->iommu);
> +
> +err_sysfs_remove:
> +	iommu_device_sysfs_remove(&qcom_iommu->iommu);
> +
> +	return ret;

It looks like we're also missing this logic in arm-smmu/arm-smmu.c and
arm-smmu-v3/arm-smmu-v3.c. Would you be able to fix those up too, please?

Will