io range is not mandatory according to pcie spec,
so allow bridge configurations without io address
space assigned.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
---
 MdeModulePkg/Bus/Pci/PciHostBridgeDxe/PciHostBridge.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/MdeModulePkg/Bus/Pci/PciHostBridgeDxe/PciHostBridge.c b/MdeModulePkg/Bus/Pci/PciHostBridgeDxe/PciHostBridge.c
index b20bcd310ad5..51a3b987967f 100644
--- a/MdeModulePkg/Bus/Pci/PciHostBridgeDxe/PciHostBridge.c
+++ b/MdeModulePkg/Bus/Pci/PciHostBridgeDxe/PciHostBridge.c
@@ -1085,6 +1085,9 @@ NotifyPhase (
               RootBridge->ResAllocNode[Index].Base   = BaseAddress;
               RootBridge->ResAllocNode[Index].Status = ResAllocated;
               DEBUG ((DEBUG_INFO, "Success\n"));
+            } else if (Index == TypeIo) {
+              /* optional on PCIe */
+              DEBUG ((DEBUG_INFO, "No IO\n"));
             } else {
               ReturnStatus = EFI_OUT_OF_RESOURCES;
               DEBUG ((DEBUG_ERROR, "Out Of Resource!\n"));
-- 
2.34.1



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