linux-kernel - Re: [PATCH 4/5] iommu/tegra-smmu: Add PCI support

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Message-ID: <20200928223114.GA4816@Asurada-Nvidia>
Date:   Mon, 28 Sep 2020 15:31:15 -0700
From:   Nicolin Chen <nicoleotsuka@...il.com>
To:     Dmitry Osipenko <digetx@...il.com>
Cc:     thierry.reding@...il.com, joro@...tes.org, krzk@...nel.org,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org,
        iommu@...ts.linux-foundation.org, jonathanh@...dia.com
Subject: Re: [PATCH 4/5] iommu/tegra-smmu: Add PCI support

On Sun, Sep 27, 2020 at 01:18:15AM +0300, Dmitry Osipenko wrote:
> 26.09.2020 11:07, Nicolin Chen пишет:
> ...
> > +#ifdef CONFIG_PCI
> > +	if (!iommu_present(&pci_bus_type)) {
> 
> Is this iommu_present() check really needed?
> 
> > +		pci_request_acs();
> 
> Shouldn't pci_request_acs() be invoked *after* bus_set_iommu() succeeds?

Will move it after that. Thanks!