xen/pci: Check for PCI bridge before using it.
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>
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@ -59,7 +59,7 @@ static int xen_add_device(struct device *dev)
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#ifdef CONFIG_ACPI
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handle = DEVICE_ACPI_HANDLE(&pci_dev->dev);
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if (!handle)
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if (!handle && pci_dev->bus->bridge)
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handle = DEVICE_ACPI_HANDLE(pci_dev->bus->bridge);
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#ifdef CONFIG_PCI_IOV
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if (!handle && pci_dev->is_virtfn)
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