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From: Jean-Philippe Brucker <jean-philippe@linaro.org>
To: Hanjun Guo <guohanjun@huawei.com>
Cc: Joerg Roedel <jroedel@suse.de>, Will Deacon <will@kernel.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org,
	Bjorn Andersson <bjorn.andersson@linaro.org>,
	iommu@lists.linux-foundation.org,
	Thierry Reding <thierry.reding@gmail.com>,
	linux-mediatek@lists.infradead.org,
	Andy Gross <agross@kernel.org>,
	Sudeep Holla <sudeep.holla@arm.com>,
	Matthias Brugger <matthias.bgg@gmail.com>,
	Sean Paul <sean@poorly.run>, Robin Murphy <robin.murphy@arm.com>
Subject: Re: [PATCH v4 02/16] ACPI/IORT: Remove direct access of dev->iommu_fwspec
Date: Fri, 27 Mar 2020 09:45:46 +0100
Message-ID: <20200327084546.GA4083132@myrica> (raw)
In-Reply-To: <82dea1be-4a2e-e914-c607-8aeb924eb36f@huawei.com>

On Fri, Mar 27, 2020 at 11:30:53AM +0800, Hanjun Guo wrote:
> On 2020/3/26 23:08, Joerg Roedel wrote:
> > From: Joerg Roedel <jroedel@suse.de>
> > 
> > Use the accessor functions instead of directly dereferencing
> > dev->iommu_fwspec.
> > 
> > Tested-by: Hanjun Guo <guohanjun@huawei.com>
> > Reviewed-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
> > Signed-off-by: Joerg Roedel <jroedel@suse.de>
> > ---
> >  drivers/acpi/arm64/iort.c | 6 ++++--
> >  1 file changed, 4 insertions(+), 2 deletions(-)
> > 
> > diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c
> > index ed3d2d1a7ae9..7d04424189df 100644
> > --- a/drivers/acpi/arm64/iort.c
> > +++ b/drivers/acpi/arm64/iort.c
> > @@ -1015,6 +1015,7 @@ const struct iommu_ops *iort_iommu_configure(struct device *dev)
> >  		return ops;
> >  
> >  	if (dev_is_pci(dev)) {
> > +		struct iommu_fwspec *fwspec;
> >  		struct pci_bus *bus = to_pci_dev(dev)->bus;
> >  		struct iort_pci_alias_info info = { .dev = dev };
> >  
> > @@ -1027,8 +1028,9 @@ const struct iommu_ops *iort_iommu_configure(struct device *dev)
> >  		err = pci_for_each_dma_alias(to_pci_dev(dev),
> >  					     iort_pci_iommu_init, &info);
> 
> ...
> 
> >  
> > -		if (!err && iort_pci_rc_supports_ats(node))
> > -			dev->iommu_fwspec->flags |= IOMMU_FWSPEC_PCI_RC_ATS;
> > +		fwspec = dev_iommu_fwspec_get(dev);
> > +		if (fwspec && iort_pci_rc_supports_ats(node))
> 
> Should we check !err as well?

No need, the check should have been on fwspec from the beginning. Checking
err was just a lazy shortcut on my part, as we're really just making sure
that we can dereference fwspec->flags here.

Thanks,
Jean

> 
> Thanks
> Hanjun
> 
> > +			fwspec->flags |= IOMMU_FWSPEC_PCI_RC_ATS;
> >  	} else {
> >  		int i = 0;
> >  
> > 
> 
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Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-26 15:08 [PATCH v4 00/16] iommu: Move iommu_fwspec out of 'struct device' Joerg Roedel
2020-03-26 15:08 ` [PATCH v4 01/16] iommu: Define dev_iommu_fwspec_get() for !CONFIG_IOMMU_API Joerg Roedel
2020-03-26 15:08 ` [PATCH v4 02/16] ACPI/IORT: Remove direct access of dev->iommu_fwspec Joerg Roedel
2020-03-27  3:30   ` Hanjun Guo
2020-03-27  8:45     ` Jean-Philippe Brucker [this message]
2020-03-26 15:08 ` [PATCH v4 03/16] drm/msm/mdp5: " Joerg Roedel
2020-03-26 15:08 ` [PATCH v4 04/16] iommu/tegra-gart: " Joerg Roedel
2020-03-26 15:08 ` [PATCH v4 05/16] iommu: Rename struct iommu_param to dev_iommu Joerg Roedel
2020-03-26 15:12   ` Greg Kroah-Hartman
2020-03-26 15:08 ` [PATCH v4 06/16] iommu: Move iommu_fwspec to struct dev_iommu Joerg Roedel
2020-03-26 15:12   ` Greg Kroah-Hartman
2020-03-26 15:08 ` [PATCH v4 07/16] iommu/arm-smmu: Fix uninitilized variable warning Joerg Roedel
2020-03-26 15:08 ` [PATCH v4 08/16] iommu: Introduce accessors for iommu private data Joerg Roedel
2020-03-26 15:08 ` [PATCH v4 09/16] iommu/arm-smmu-v3: Use accessor functions " Joerg Roedel
2020-03-26 15:08 ` [PATCH v4 10/16] iommu/arm-smmu: Refactor master_cfg/fwspec usage Joerg Roedel
2020-03-26 15:08 ` [PATCH v4 11/16] iommu/arm-smmu: Use accessor functions for iommu private data Joerg Roedel
2020-03-26 15:08 ` [PATCH v4 12/16] iommu/renesas: " Joerg Roedel
2020-03-26 15:08 ` [PATCH v4 13/16] iommu/mediatek: " Joerg Roedel
2020-03-26 15:08 ` [PATCH v4 14/16] iommu/qcom: " Joerg Roedel
2020-03-26 15:08 ` [PATCH v4 15/16] iommu/virtio: " Joerg Roedel
2020-03-26 15:08 ` [PATCH v4 16/16] iommu: Move fwspec->iommu_priv to struct dev_iommu Joerg Roedel
2020-03-27 10:16 ` [PATCH v4 00/16] iommu: Move iommu_fwspec out of 'struct device' Joerg Roedel

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