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

[Joerg Roedel <joro-zLv9SwRftAIdnm+yROfE0A@public.gmane.org>]

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