1 files changed, 2 insertions, 2 deletions

diff --git a/arch/powerpc/platforms/pseries/iommu.c b/arch/powerpc/platforms/pseries/iommu.c
index b7dfc1359d01..3e8865b187de 100644
--- a/arch/powerpc/platforms/pseries/iommu.c
+++ b/arch/powerpc/platforms/pseries/iommu.c
@@ -927,7 +927,7 @@ static int query_ddw(struct pci_dev *dev, const u32 *ddw_avail,
         dn = pci_device_to_OF_node(dev);
         pdn = PCI_DN(dn);
         buid = pdn->phb->buid;
-        cfg_addr = (pdn->busno << 8) | pdn->devfn;
+        cfg_addr = ((pdn->busno << 16) | (pdn->devfn << 8));
 
         ret = rtas_call(ddw_avail[0], 3, 5, (u32 *)query,
                   cfg_addr, BUID_HI(buid), BUID_LO(buid));
@@ -956,7 +956,7 @@ static int create_ddw(struct pci_dev *dev, const u32 *ddw_avail,
         dn = pci_device_to_OF_node(dev);
         pdn = PCI_DN(dn);
         buid = pdn->phb->buid;
-        cfg_addr = (pdn->busno << 8) | pdn->devfn;
+        cfg_addr = ((pdn->busno << 16) | (pdn->devfn << 8));
 
         do {
                 /* extra outputs are LIOBN and dma-addr (hi, lo) */