[Xen-devel] [PATCH] xen: add bridge check

["Zhang, Yang Z" <yang.z.zhang@xxxxxxxxx>]

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@xxxxxxxxx>
---
 drivers/xen/pci.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/xen/pci.c b/drivers/xen/pci.c
index b84bf0b..18fff88 100644
--- a/drivers/xen/pci.c
+++ b/drivers/xen/pci.c
@@ -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)

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