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

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Date:   Tue, 8 Jun 2021 20:25:00 +0530
From:   Amey Narkhede <ameynarkhede03@...il.com>
To:     Will Deacon <will@...nel.org>
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 21/06/08 10:29AM, Will Deacon wrote:
> 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

Sure, I will send a v2 with this and new patches.

Thanks,
Amey