linux-kernel - Re: [PATCH v4 2/3] iommu/tegra-smmu: Rework tegra_smmu_probe

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Message-ID: <20201005094752.GG425362@ulmo>
Date:   Mon, 5 Oct 2020 11:47:52 +0200
From:   Thierry Reding <thierry.reding@...il.com>
To:     Nicolin Chen <nicoleotsuka@...il.com>
Cc:     Dmitry Osipenko <digetx@...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 2/3] iommu/tegra-smmu: Rework tegra_smmu_probe_device()

On Fri, Oct 02, 2020 at 12:53:28PM -0700, Nicolin Chen wrote:
> On Fri, Oct 02, 2020 at 05:58:29PM +0300, Dmitry Osipenko wrote:
> > 02.10.2020 17:22, Dmitry Osipenko пишет:
> > > 02.10.2020 09:08, Nicolin Chen пишет:
> > >> -static void tegra_smmu_release_device(struct device *dev)
> > >> -{
> > >> -	dev_iommu_priv_set(dev, NULL);
> > >> -}
> > >> +static void tegra_smmu_release_device(struct device *dev) {}
> > > 
> > > Please keep the braces as-is.
> > > 
> > 
> > I noticed that you borrowed this style from the sun50i-iommu driver, but
> > this is a bit unusual coding style for the c files. At least to me it's
> > unusual to see header-style function stub in a middle of c file. But
> > maybe it's just me.
> 
> I don't see a rule in ./Documentation/process/coding-style.rst
> against this, and there're plenty of drivers doing so. If you
> feel uncomfortable with this style, you may add a rule to that
> doc so everyone will follow :)

I also prefer braces on separate lines. Even better would be to just
drop this entirely and make ->release_device() optional. At least the
following drivers could be cleaned up that way:

    * fsl-pamu
    * msm-iommu
    * sun50i-iommu
    * tegra-gart
    * tegra-smmu

And it looks like mtk-iommu and mtk-iommu-v1 do only iommu_fwspec_free()
in their ->release_device() implementations, but that's already done via
iommu_release_device().

Thierry

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