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MdeModulePkg: Fix PciBus hang issue 

LocatePciExpressCapabilityRegBlock () doesn't check the return status of Pci.Read().
Certain platform's PciRootBridge.Pci.Read() doesn't support PCIE access causing the CapabilityEntry not updated.
If the uninitialized CapabilityEntry equals to a big enough initial value, the while-loop will never end.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ruiyu Ni <ruiyu.ni@intel.com>
Reviewed-by: Maurice Ma <maurice.ma@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@17513 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
Ruiyu Ni 2015-05-27 01:22:13 +00:00 committed by niruiyu
parent e6557276f0
commit edf289685b
1 changed files with 15 additions and 11 deletions
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8
MdeModulePkg/Bus/Pci/PciBusDxe/PciCommand.c
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@ -1,7 +1,7 @@
/** @file
PCI command register operations supporting functions implementation for PCI Bus module.
Copyright (c) 2006 - 2009, Intel Corporation. All rights reserved.<BR>
Copyright (c) 2006 - 2015, 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
@ -200,6 +200,7 @@ LocatePciExpressCapabilityRegBlock (
OUT UINT32 *NextRegBlock OPTIONAL
)
{
EFI_STATUS Status;
UINT32 CapabilityPtr;
UINT32 CapabilityEntry;
UINT16 CapabilityID;
@ -222,13 +223,16 @@ LocatePciExpressCapabilityRegBlock (
// Mask it to DWORD alignment per PCI spec
//
CapabilityPtr &= 0xFFC;
PciIoDevice->PciIo.Pci.Read (
Status = PciIoDevice->PciIo.Pci.Read (
&PciIoDevice->PciIo,
EfiPciIoWidthUint32,
CapabilityPtr,
1,
&CapabilityEntry
);
if (EFI_ERROR (Status)) {
break;
}
CapabilityID = (UINT16) CapabilityEntry;