Re: [PATCH] MdeModulePkg/IncompPciDeviceSupport: Use correct descriptor length

["Zeng, Star" <star.zeng@intel.com>]

Reviewed-by: Star Zeng <star.zeng@intel.com>

-----Original Message-----
From: edk2-devel [mailto:edk2-devel-bounces@lists.01.org] On Behalf Of Ruiyu Ni
Sent: Wednesday, June 13, 2018 4:54 PM
To: edk2-devel@lists.01.org
Cc: Zeng, Star <star.zeng@intel.com>
Subject: [edk2] [PATCH] MdeModulePkg/IncompPciDeviceSupport: Use correct descriptor length

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.ni@intel.com>
Cc: Star Zeng <star.zeng@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/IncompatibleP
+++ ciDeviceSupport.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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