From 7742a8dd23ec6366a9741d8ff9ab042ca8b21c62 Mon Sep 17 00:00:00 2001
From: Dandan Bi <dandan.bi@intel.com>
Date: Wed, 7 Feb 2018 09:00:17 +0800
Subject: MdeModulePkg/PciBusDxe: Fix VS2012 build failure

Initialize local variable to suppress warning C4703:
potentially uninitialized local pointer variable.

Both reads (dereferences) of "PciRootBridgeIo" in
PciBusDriverBindingStart() are only reached if
"gFullEnumeration" is TRUE on entry *and* we successfully
open the EfiPciRootBridgeIoProtocol interface.

Cc: Star Zeng <star.zeng@intel.com>
Cc: Ruiyu Ni <ruiyu.ni@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Dandan Bi <dandan.bi@intel.com>
Reviewed-by: Ruiyu Ni <ruiyu.ni@intel.com>
Reviewed-by: Star Zeng <star.zeng@intel.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
(cherry picked from commit a012bf6e3e08d1fc878ffb271932e3cbce4a71f6)
---
 MdeModulePkg/Bus/Pci/PciBusDxe/PciBus.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/MdeModulePkg/Bus/Pci/PciBusDxe/PciBus.c b/MdeModulePkg/Bus/Pci/PciBusDxe/PciBus.c
index c48e3bba96..a1654c0025 100644
--- a/MdeModulePkg/Bus/Pci/PciBusDxe/PciBus.c
+++ b/MdeModulePkg/Bus/Pci/PciBusDxe/PciBus.c
@@ -244,6 +244,11 @@ PciBusDriverBindingStart (
   EFI_DEVICE_PATH_PROTOCOL        *ParentDevicePath;
   EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL *PciRootBridgeIo;
 
+  //
+  // Initialize PciRootBridgeIo to suppress incorrect compiler warning.
+  //
+  PciRootBridgeIo = NULL;
+
   //
   // Check RemainingDevicePath validation
   //
-- 
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