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intel-iommu: Fix lookup in add device 

We can't assume this device exists, fall back to the bridge itself.

Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Tested-by: Matthew Thode <prometheanfire@gentoo.org>
Cc: stable@vger.kernel.org
Signed-off-by: Joerg Roedel <joro@8bytes.org>
This commit is contained in:
Alex Williamson 2012-11-13 10:22:03 -07:00 committed by Joerg Roedel
parent b334b64862
commit 3da4af0aff
1 changed files with 2 additions and 2 deletions
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4
drivers/iommu/intel-iommu.c
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@ -4108,7 +4108,7 @@ static void swap_pci_ref(struct pci_dev **from, struct pci_dev *to)
static int intel_iommu_add_device(struct device *dev)
{
struct pci_dev *pdev = to_pci_dev(dev);
struct pci_dev *bridge, *dma_pdev;
struct pci_dev *bridge, *dma_pdev = NULL;
struct iommu_group *group;
int ret;
@ -4122,7 +4122,7 @@ static int intel_iommu_add_device(struct device *dev)
dma_pdev = pci_get_domain_bus_and_slot(
pci_domain_nr(pdev->bus),
bridge->subordinate->number, 0);
else
if (!dma_pdev)
dma_pdev = pci_dev_get(bridge);
} else
dma_pdev = pci_dev_get(pdev);