Per PI spec, the Length value is the length of the ACPI descriptor
in bytes, excluding the first two fields.
The patch fixes the code to report the correct descriptor length
by excluding 3-byte first two fields.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Ruiyu Ni <ruiyu...@intel.com>
Cc: Star Zeng <star.z...@intel.com>
---
 .../IncompatiblePciDeviceSupportDxe/IncompatiblePciDeviceSupport.c    | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git 
a/MdeModulePkg/Bus/Pci/IncompatiblePciDeviceSupportDxe/IncompatiblePciDeviceSupport.c
 
b/MdeModulePkg/Bus/Pci/IncompatiblePciDeviceSupportDxe/IncompatiblePciDeviceSupport.c
index 149662d14d..da8daba87d 100644
--- 
a/MdeModulePkg/Bus/Pci/IncompatiblePciDeviceSupportDxe/IncompatiblePciDeviceSupport.c
+++ 
b/MdeModulePkg/Bus/Pci/IncompatiblePciDeviceSupportDxe/IncompatiblePciDeviceSupport.c
@@ -5,7 +5,7 @@
   Incompatible PCI Device Support protocol allows the PCI bus driver to support
   resource allocation for some PCI devices that do not comply with the PCI 
Specification.
 
-Copyright (c) 2009 - 2017, Intel Corporation. All rights reserved.<BR>
+Copyright (c) 2009 - 2018, Intel Corporation. All rights reserved.<BR>
 This program and the accompanying materials
 are licensed and made available under the terms and conditions of the BSD 
License
 which accompanies this distribution.  The full text of the license may be 
found at
@@ -344,7 +344,7 @@ PCheckDevice (
         Dsc = (EFI_PCI_RESOUCE_DESCRIPTOR *) (ListPtr + 1);
 
         AcpiPtr->Desc = ACPI_ADDRESS_SPACE_DESCRIPTOR;
-        AcpiPtr->Len = (UINT16) sizeof (EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR);
+        AcpiPtr->Len = (UINT16) sizeof (EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR) - 3;
         AcpiPtr->ResType = (UINT8) Dsc->ResType;
         AcpiPtr->GenFlag = (UINT8) Dsc->GenFlag;
         AcpiPtr->SpecificFlag = (UINT8) Dsc->SpecificFlag;
-- 
2.16.1.windows.1

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