MdeModulePkg/PciBus: Revert "Enable BM on P2P bridges on demand"

[mirror_edk2.git] / MdeModulePkg / Bus / Pci / PciBusDxe / PciIo.c

diff --git a/MdeModulePkg/Bus/Pci/PciBusDxe/PciIo.c b/MdeModulePkg/Bus/Pci/PciBusDxe/PciIo.c
index 659f480d712234871485664f6de596412aa0887d..cc7125e4fc3c00f924fc7ea11d482f785219cd14 100644 (file)
--- a/MdeModulePkg/Bus/Pci/PciBusDxe/PciIo.c
+++ b/MdeModulePkg/Bus/Pci/PciBusDxe/PciIo.c
@@ -1348,8 +1348,7 @@ ModifyRootBridgeAttributes (
   //\r
   Attributes &= ~(UINT64)(EFI_PCI_IO_ATTRIBUTE_EMBEDDED_DEVICE |\r
                           EFI_PCI_IO_ATTRIBUTE_EMBEDDED_ROM |\r
-                          EFI_PCI_IO_ATTRIBUTE_DUAL_ADDRESS_CYCLE |\r
-                          EFI_PCI_IO_ATTRIBUTE_BUS_MASTER);\r
+                          EFI_PCI_IO_ATTRIBUTE_DUAL_ADDRESS_CYCLE);\r
 \r
   //\r
   // Record the new attribute of the Root Bridge\r
@@ -1727,11 +1726,12 @@ PciIoAttributes (
   }\r
   //\r
   // The upstream bridge should be also set to revelant attribute\r
-  // expect for IO and Mem\r
+  // expect for IO, Mem and BusMaster\r
   //\r
   UpStreamAttributes = Attributes &\r
                        (~(EFI_PCI_IO_ATTRIBUTE_IO     |\r
-                          EFI_PCI_IO_ATTRIBUTE_MEMORY\r
+                          EFI_PCI_IO_ATTRIBUTE_MEMORY |\r
+                          EFI_PCI_IO_ATTRIBUTE_BUS_MASTER\r
                           )\r
                         );\r
   UpStreamBridge = PciIoDevice->Parent;\r