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

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Date:   Wed, 30 Sep 2020 00:16:50 -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 08:58:50AM +0300, Dmitry Osipenko wrote:
> 30.09.2020 08:29, Nicolin Chen пишет:
> > Hi Dmitry,
> > 
> > On Wed, Sep 30, 2020 at 08:10:07AM +0300, Dmitry Osipenko wrote:
> >> 30.09.2020 03:30, Nicolin Chen пишет:
> >>> -	group->group = iommu_group_alloc();
> >>> +	group->group = pci ? pci_device_group(dev) : iommu_group_alloc();
> >>
> >> This will be nicer to write as:
> >>
> >> if (dev_is_pci(dev))
> >>     group->group = pci_device_group(dev);
> >> else
> >>     group->group = generic_device_group(dev);
> > 
> > Why is that nicer? I don't feel mine is hard to read at all...
> > 
> 
> Previously you said that you're going to add USB support, so I assume
> there will be something about USB.

I was hoping that it'd work for USB. Yet USB doesn't seem to have
an different function for device_group().

> It's also a kinda common style that majority of Tegra drivers use in
> upstream kernel. But yours variant is good too if there won't be a need
> to change it later on.

Okay..I'll use yours then.

Thanks