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-rw-r--r--arch/x86_64/kernel/pci-calgary.c13
1 files changed, 6 insertions, 7 deletions
diff --git a/arch/x86_64/kernel/pci-calgary.c b/arch/x86_64/kernel/pci-calgary.c
index ba16c968ca3..71da01e73f0 100644
--- a/arch/x86_64/kernel/pci-calgary.c
+++ b/arch/x86_64/kernel/pci-calgary.c
@@ -367,16 +367,15 @@ static inline struct iommu_table *find_iommu_table(struct device *dev)
pdev = to_pci_dev(dev);
- /* is the device behind a bridge? */
- if (unlikely(pdev->bus->parent))
- pbus = pdev->bus->parent;
- else
- pbus = pdev->bus;
+ pbus = pdev->bus;
+
+ /* is the device behind a bridge? Look for the root bus */
+ while (pbus->parent)
+ pbus = pbus->parent;
tbl = pci_iommu(pbus);
- BUG_ON(pdev->bus->parent &&
- (tbl->it_busno != pdev->bus->parent->number));
+ BUG_ON(tbl && (tbl->it_busno != pbus->number));
return tbl;
}