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xen/pci: Check for PCI bridge before using it.

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Some SR-IOV devices may use more than one bus number, but there is no real bridges
because that have internal routing mechanism. So need to check whether the bridge is
existing before using it.

Signed-off-by: Yang Zhang <yang.z.zhang@Intel.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Zhang, Yang Z 2012-05-22 08:40:16 +00:00 committed by Konrad Rzeszutek Wilk
parent 5e152e6c4b
commit 780dbcd0ee
1 changed files with 1 additions and 1 deletions
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drivers/xen/pci.c
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@ -59,7 +59,7 @@ static int xen_add_device(struct device *dev)
#ifdef CONFIG_ACPI
handle = DEVICE_ACPI_HANDLE(&pci_dev->dev);
if (!handle)
if (!handle && pci_dev->bus->bridge)
handle = DEVICE_ACPI_HANDLE(pci_dev->bus->bridge);
#ifdef CONFIG_PCI_IOV
if (!handle && pci_dev->is_virtfn)