PCI: fix wrong assumption in pci_find_upstream_pcie_bridge

Current pci_find_upstream_pcie_bridge() has a wrong assumption that
pci_bus->self is NULL on the root pci bus. But it might not true on
some platforms. Because of this wrong assumption, current
pci_find_upstream_pcie_bridge() might cause endless loop. We must
check pci_bus->parent instead.

Signed-off-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

diff --git a/drivers/pci/search.c b/drivers/pci/search.c
index 5af8bd5381497656291ec61de58e678e8b874dd6..710d4ea6956860bdadad1951408ae5999ae68654 100644 (file)
--- a/drivers/pci/search.c
+++ b/drivers/pci/search.c
@@ -29,7 +29,7 @@ pci_find_upstream_pcie_bridge(struct pci_dev *pdev)
        if (pdev->is_pcie)
                return NULL;
        while (1) {
-               if (!pdev->bus->self)
+               if (!pdev->bus->parent)
                        break;
                pdev = pdev->bus->self;
                /* a p2p bridge */