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iommu/vt-d: Only insert alias dev_info if there is an alias

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For devices without an PCI alias there will be two
device_domain_info structures added. Prevent that by
checking if the alias is different from the device.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Joerg Roedel 2015-07-23 18:09:11 +02:00
parent 127c761598
commit 08a7f456a7
1 changed files with 4 additions and 2 deletions
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6
drivers/iommu/intel-iommu.c
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@ -2319,8 +2319,8 @@ static struct dmar_domain *get_domain_for_dev(struct device *dev, int gaw)
struct device_domain_info *info = NULL; struct device_domain_info *info = NULL;
struct dmar_domain *domain, *tmp; struct dmar_domain *domain, *tmp;
struct intel_iommu *iommu; struct intel_iommu *iommu;
u16 req_id, dma_alias;
unsigned long flags; unsigned long flags;
u16 dma_alias;
u8 bus, devfn; u8 bus, devfn;
domain = find_domain(dev); domain = find_domain(dev);
@ -2331,6 +2331,8 @@ static struct dmar_domain *get_domain_for_dev(struct device *dev, int gaw)
if (!iommu) if (!iommu)
return NULL; return NULL;
req_id = ((u16)bus << 8) | devfn;
if (dev_is_pci(dev)) { if (dev_is_pci(dev)) {
struct pci_dev *pdev = to_pci_dev(dev); struct pci_dev *pdev = to_pci_dev(dev);
@ -2361,7 +2363,7 @@ static struct dmar_domain *get_domain_for_dev(struct device *dev, int gaw)
} }
/* register PCI DMA alias device */ /* register PCI DMA alias device */
if (dev_is_pci(dev)) { if (req_id != dma_alias && dev_is_pci(dev)) {
tmp = dmar_insert_one_dev_info(iommu, PCI_BUS_NUM(dma_alias), tmp = dmar_insert_one_dev_info(iommu, PCI_BUS_NUM(dma_alias),
dma_alias & 0xff, NULL, domain); dma_alias & 0xff, NULL, domain);