1 files changed, 6 insertions, 1 deletions

diff --git a/drivers/pci/intel-iommu.c b/drivers/pci/intel-iommu.c
index f3eebd2b2d72..6262c198e56e 100644
--- a/drivers/pci/intel-iommu.c
+++ b/drivers/pci/intel-iommu.c
@@ -477,11 +477,16 @@ static struct intel_iommu *device_to_iommu(u8 bus, u8 devfn)
                 if (drhd->ignored)
                         continue;
 
-                for (i = 0; i < drhd->devices_cnt; i++)
+                for (i = 0; i < drhd->devices_cnt; i++) {
                         if (drhd->devices[i] &&
                             drhd->devices[i]->bus->number == bus &&
                             drhd->devices[i]->devfn == devfn)
                                 return drhd->iommu;
+                        if (drhd->devices[i]->subordinate &&
+                            drhd->devices[i]->subordinate->number <= bus &&
+                            drhd->devices[i]->subordinate->subordinate >= bus)
+                                return drhd->iommu;
+                }
 
                 if (drhd->include_all)
                         return drhd->iommu;