[PATCH] UefiCpuPkg/CpuMpPei: Correct BIST PPI logic.

["Marvin Häuser" <Marvin.Haeuser@outlook.com>]

Currently, the SecPlatformInformation2 PPI is installed when either
there is none present or the present one doesn't lack data.
Update the logic to only install the SecPlatformInformation2 PPI when
it's not already installed so that an up-to-date PPI remains the only
one and unchanged.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Marvin Haeuser <Marvin.Haeuser@outlook.com>
---
 UefiCpuPkg/CpuMpPei/CpuBist.c | 22 +++++++++++---------
 1 file changed, 12 insertions(+), 10 deletions(-)

diff --git a/UefiCpuPkg/CpuMpPei/CpuBist.c b/UefiCpuPkg/CpuMpPei/CpuBist.c
index 20728525e2d9..5312d9f01dc8 100644
--- a/UefiCpuPkg/CpuMpPei/CpuBist.c
+++ b/UefiCpuPkg/CpuMpPei/CpuBist.c
@@ -275,18 +275,20 @@ CollectBistDataFromPpi (
     (UINTN) BistInformationSize
     );
 
-  if (SecPlatformInformation2 != NULL && NumberOfData < NumberOfProcessors) {
-    //
-    // Reinstall SecPlatformInformation2 PPI to include new BIST information
-    //
-    Status = PeiServicesReInstallPpi (
-               SecInformationDescriptor,
-               &mPeiSecPlatformInformation2Ppi
-               );
-    ASSERT_EFI_ERROR (Status);
+  if (SecPlatformInformation2 != NULL) {
+    if (NumberOfData < NumberOfProcessors) {
+      //
+      // Reinstall SecPlatformInformation2 PPI to include new BIST information
+      //
+      Status = PeiServicesReInstallPpi (
+                 SecInformationDescriptor,
+                 &mPeiSecPlatformInformation2Ppi
+                 );
+      ASSERT_EFI_ERROR (Status);
+    }
   } else {
     //
-    // Install SecPlatformInformation2 PPI to include new BIST information
+    // Install SecPlatformInformation2 PPI
     //
     Status = PeiServicesInstallPpi (&mPeiSecPlatformInformation2Ppi);
     ASSERT_EFI_ERROR(Status);
-- 
2.18.0.windows.1