[ 79/83] intel-iommu: Fix lookup in add device

[Greg Kroah-Hartman]

3.6-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Alex Williamson <alex.williamson@xxxxxxxxxx>

commit 3da4af0affbb797e8ac4c2b4598da0c34b8cc52a upstream.

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

Signed-off-by: Alex Williamson <alex.williamson@xxxxxxxxxx>
Tested-by: Matthew Thode <prometheanfire@xxxxxxxxxx>
Signed-off-by: Joerg Roedel <joro@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/iommu/intel-iommu.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -4108,7 +4108,7 @@ static void swap_pci_ref(struct pci_dev
 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
 			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);


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