diff options
| -rw-r--r-- | arch/x86_64/kernel/pci-calgary.c | 13 |
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; } |