1 files changed, 1 insertions, 1 deletions

diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
index e410e97e5b0a..3011ea7a3f82 100644
--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -1543,7 +1543,7 @@ void prealloc_protection_domains(void)
         u16 devid;
 
         while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
-                devid = (dev->bus->number << 8) | dev->devfn;
+                devid = calc_devid(dev->bus->number, dev->devfn);
                 if (devid > amd_iommu_last_bdf)
                         continue;
                 devid = amd_iommu_alias_table[devid];