[patch] MdeModulePkg/SmmCorePerformanceLib: Update mPerformanceLength

[Dandan Bi <dandan.bi@intel.com>]

In mSmmBootPerformanceTable there are two parts,
one is the FPDT table header and the other is FPDT records.
Currently:
mPerformanceLength: The length of existing FPDT records.
mMaxPerformanceLength: The maximum length allocated for
mSmmBootPerformanceTable(including FPDT table header length
and existing FPDT records length)
But when compare mPerformanceLength with mMaxPerformanceLength
to check whether need to allocate new buffer for new FPDT
record, we miss to add mPerformanceLength with header length,
which will cause pool allocation behavior is not correct.

Now update the mPerformanceLength to fix this issue:
updated mPerformanceLength = FPDT table header length
+ existing FPDT records length.

Cc: Liming Gao <liming.gao@intel.com>
Cc: Star Zeng <star.zeng@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Dandan Bi <dandan.bi@intel.com>
---
 .../Library/SmmCorePerformanceLib/SmmCorePerformanceLib.c         | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/MdeModulePkg/Library/SmmCorePerformanceLib/SmmCorePerformanceLib.c b/MdeModulePkg/Library/SmmCorePerformanceLib/SmmCorePerformanceLib.c
index f18c3fb60d..e03d41ed37 100644
--- a/MdeModulePkg/Library/SmmCorePerformanceLib/SmmCorePerformanceLib.c
+++ b/MdeModulePkg/Library/SmmCorePerformanceLib/SmmCorePerformanceLib.c
@@ -43,11 +43,11 @@ typedef struct {
 } HANDLE_GUID_MAP;
 
 HANDLE_GUID_MAP      mCacheHandleGuidTable[CACHE_HANDLE_GUID_COUNT];
 UINTN                mCachePairCount = 0;
 
-UINT32               mPerformanceLength    = 0;
+UINT32               mPerformanceLength    = sizeof (SMM_BOOT_PERFORMANCE_TABLE);
 UINT32               mMaxPerformanceLength = 0;
 UINT32               mLoadImageCount       = 0;
 BOOLEAN              mFpdtDataIsReported   = FALSE;
 BOOLEAN              mLackSpaceIsReport    = FALSE;
 CHAR8                *mPlatformLanguage    = NULL;
@@ -98,19 +98,19 @@ GetFpdtRecordPtr (
     // Check if pre-allocated buffer is full
     //
     if (mPerformanceLength + RecordSize > mMaxPerformanceLength) {
       mSmmBootPerformanceTable = ReallocatePool (
                                    mPerformanceLength,
-                                   mPerformanceLength + sizeof (SMM_BOOT_PERFORMANCE_TABLE) + RecordSize + FIRMWARE_RECORD_BUFFER,
+                                   mPerformanceLength + RecordSize + FIRMWARE_RECORD_BUFFER,
                                    mSmmBootPerformanceTable
                               );
 
       if (mSmmBootPerformanceTable == NULL) {
         return EFI_OUT_OF_RESOURCES;
       }
-      mSmmBootPerformanceTable->Header.Length = sizeof (SMM_BOOT_PERFORMANCE_TABLE) + mPerformanceLength;
-      mMaxPerformanceLength = mPerformanceLength + sizeof (SMM_BOOT_PERFORMANCE_TABLE) + RecordSize + FIRMWARE_RECORD_BUFFER;
+      mSmmBootPerformanceTable->Header.Length = mPerformanceLength;
+      mMaxPerformanceLength = mPerformanceLength + RecordSize + FIRMWARE_RECORD_BUFFER;
     }
     //
     // Covert buffer to FPDT Ptr Union type.
     //
     FpdtRecordPtr->RecordHeader = (EFI_ACPI_5_0_FPDT_PERFORMANCE_RECORD_HEADER *)((UINT8*)mSmmBootPerformanceTable + mSmmBootPerformanceTable->Header.Length);
-- 
2.14.3.windows.1