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Date:   Mon, 22 Jun 2020 13:55:37 +0200
From:   Joerg Roedel <joro@8bytes.org>
To:     Zhangfei Gao <zhangfei.gao@linaro.org>
Cc:     Bjorn Helgaas <helgaas@kernel.org>,
        Bjorn Helgaas <bhelgaas@google.com>,
        Arnd Bergmann <arnd@arndb.de>,
        Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
        Hanjun Guo <guohanjun@huawei.com>,
        Sudeep Holla <sudeep.holla@arm.com>,
        "Rafael J. Wysocki" <rjw@rjwysocki.net>,
        Len Brown <lenb@kernel.org>,
        jean-philippe <jean-philippe@linaro.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Herbert Xu <herbert@gondor.apana.org.au>,
        kenneth-lee-2012@foxmail.com, Wangzhou <wangzhou1@hisilicon.com>,
        linux-kernel@vger.kernel.org, linux-crypto@vger.kernel.org,
        iommu@lists.linux-foundation.org, linux-acpi@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org, linux-pci@vger.kernel.org
Subject: Re: [PATCH 0/2] Introduce PCI_FIXUP_IOMMU
Message-ID: <20200622115536.GH3701@8bytes.org>
References: <20200601174104.GA734973@bjorn-Precision-5520>
 <779f4044-cf6a-b0d3-916f-0274450c07d3@linaro.org>
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On Thu, Jun 04, 2020 at 09:33:07PM +0800, Zhangfei Gao wrote:
> +++ b/drivers/iommu/iommu.c
> @@ -2418,6 +2418,10 @@ int iommu_fwspec_init(struct device *dev, struct
> fwnode_handle *iommu_fwnode,
> ??????? fwspec->iommu_fwnode = iommu_fwnode;
> ??????? fwspec->ops = ops;
> ??????? dev_iommu_fwspec_set(dev, fwspec);
> +
> +?????? if (dev_is_pci(dev))
> +?????????????? pci_fixup_device(pci_fixup_final, to_pci_dev(dev));
> +

That's not going to fly, I don't think we should run the fixups twice,
and they should not be run from IOMMU code. Is the only reason for this
second pass that iommu_fwspec is not yet allocated when it runs the
first time? I ask because it might be easier to just allocate the struct
earlier then.

Regards,

	Joerg