linux-kernel - Re: [PATCH 5/6] iommu/amd: Add support for non-pci devices

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Date:	Fri, 8 Jan 2016 18:01:45 +0100
From:	Joerg Roedel <joro@...tes.org>
To:	Wan Zongshun <vw@...mu.org>
Cc:	Wan ZongShun <mcuos.com@...il.com>,
	Wan Zongshun <vincent.wan@....com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	iommu@...ts.linux-foundation.org, Ray Huang <ray.huang@....com>,
	Borislav Petkov <bp@...e.de>, ken.xue@....com
Subject: Re: [PATCH 5/6] iommu/amd: Add support for non-pci devices

On Fri, Jan 08, 2016 at 10:52:59PM +0800, Wan Zongshun wrote:
> Actually I am supposing the '.add_device' will be the first called
> in iommu initializing stage, so I think as long as having no error
> of check device here, any call-sites of get_device_id() will be
> fine, because adding device successfully should be the pre-condition
> of any iommu function can be performed, please correct me.
> 
> static int amd_iommu_add_device(struct device *dev)
> {
> 	struct iommu_dev_data *dev_data;
> 	struct iommu_domain *domain;
> 	struct amd_iommu *iommu;
> 	u16 devid;
> 	int ret;
> 
> 	if (!check_device(dev) || get_dev_data(dev))
> 		return 0;
> 
> 	devid = get_device_id(dev);
> 	iommu = amd_iommu_rlookup_table[devid];

There are places in the interrupt remapping code that call get_device_id
without calling check_device first. See get_irq_domain and get_devid.


	Joerg