linux-kernel - Re: [PATCH v2 3/3] iommu/tegra-smmu: Add PCI support

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Message-ID: <20200930052759.GA31821@Asurada-Nvidia>
Date:   Tue, 29 Sep 2020 22:28:00 -0700
From:   Nicolin Chen <nicoleotsuka@...il.com>
To:     Dmitry Osipenko <digetx@...il.com>
Cc:     thierry.reding@...il.com, joro@...tes.org, krzk@...nel.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 v2 3/3] iommu/tegra-smmu: Add PCI support

On Wed, Sep 30, 2020 at 08:10:00AM +0300, Dmitry Osipenko wrote:
> 30.09.2020 03:30, Nicolin Chen пишет:
> ...
> > +#ifdef CONFIG_PCI
> > +	if (!iommu_present(&pci_bus_type)) {
> 
> Could you please explain why this check is needed?

That's referencing what's in the arm-smmu.c file, since it does
not hurt to have a check.