linux-kernel - Re: [PATCH v4 3/3] iommu/tegra-smmu: Add PCI support

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Date:   Fri, 2 Oct 2020 10:45:32 -0700
From:   Nicolin Chen <nicoleotsuka@...il.com>
To:     Dmitry Osipenko <digetx@...il.com>
Cc:     thierry.reding@...il.com, joro@...tes.org, vdumpa@...dia.com,
        jonathanh@...dia.com, linux-tegra@...r.kernel.org,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 3/3] iommu/tegra-smmu: Add PCI support

On Fri, Oct 02, 2020 at 05:35:24PM +0300, Dmitry Osipenko wrote:
> 02.10.2020 09:08, Nicolin Chen пишет:
> > @@ -865,7 +866,11 @@ static struct iommu_group *tegra_smmu_device_group(struct device *dev)
> >  	group->smmu = smmu;
> >  	group->soc = soc;
> >  
> > -	group->group = iommu_group_alloc();
> > +	if (dev_is_pci(dev))
> > +		group->group = pci_device_group(dev);
> > +	else
> > +		group->group = generic_device_group(dev);
> > +
> >  	if (IS_ERR(group->group)) {
> >  		devm_kfree(smmu->dev, group);
> >  		mutex_unlock(&smmu->lock);
> > @@ -1069,22 +1074,32 @@ struct tegra_smmu *tegra_smmu_probe(struct device *dev,
> >  	iommu_device_set_fwnode(&smmu->iommu, dev->fwnode);
> >  
> >  	err = iommu_device_register(&smmu->iommu);
> > -	if (err) {
> > -		iommu_device_sysfs_remove(&smmu->iommu);
> > -		return ERR_PTR(err);
> > -	}
> > +	if (err)
> > +		goto err_sysfs;
> >  
> >  	err = bus_set_iommu(&platform_bus_type, &tegra_smmu_ops);
> > -	if (err < 0) {
> > -		iommu_device_unregister(&smmu->iommu);
> > -		iommu_device_sysfs_remove(&smmu->iommu);
> > -		return ERR_PTR(err);
> > -	}
> > +	if (err < 0)
> > +		goto err_unregister;
> > +
> > +#ifdef CONFIG_PCI
> > +	err = bus_set_iommu(&pci_bus_type, &tegra_smmu_ops);
> > +	if (err < 0)
> > +		goto err_bus_set;
> > +#endif
> >  
> >  	if (IS_ENABLED(CONFIG_DEBUG_FS))
> >  		tegra_smmu_debugfs_init(smmu);
> >  
> >  	return smmu;
> > +
> > +err_bus_set: __maybe_unused;
> 
> __maybe_unused?

In order to mute a build warning when CONFIG_PCI=n...