PRD: Adjust core checkstop handling for EX rt deconfig

Change-Id: Iaf035e51a08f7cef6d691338c696ca00986eaf07
CQ: SW439014
Reviewed-on: http://rchgit01.rchland.ibm.com/gerrit1/64435
Tested-by: Jenkins Server <pfd-jenkins+hostboot@us.ibm.com>
Reviewed-by: Caleb N. Palmer <cnpalmer@us.ibm.com>
Reviewed-by: Zane C. Shelley <zshelle@us.ibm.com>
Reviewed-on: http://rchgit01.rchland.ibm.com/gerrit1/64437
Tested-by: Jenkins OP Build CI <op-jenkins+hostboot@us.ibm.com>
Tested-by: FSP CI Jenkins <fsp-CI-jenkins+hostboot@us.ibm.com>
Tested-by: Jenkins OP HW <op-hw-jenkins+hostboot@us.ibm.com>

src/usr/diag/prdf/common/plat/p9/prdfP9Ec.C

@@ -112,13 +112,12 @@ int32_t PostAnalysis( ExtensibleChip * i_chip,
 #ifdef __HOSTBOOT_RUNTIME
     if ( io_sc.service_data->isProcCoreCS() )
     {
+        ExtensibleChip * n_chip = getNeighborCore(i_chip);
         maskIfCoreCs(i_chip);
         rtDcnfgCore(i_chip);
-        ExtensibleChip * n_chip = getNeighborCore(i_chip);
         if (n_chip != nullptr)
         {
             maskIfCoreCs(n_chip);
-            rtDcnfgCore(n_chip);
         }
     }
     else

src/usr/diag/prdf/common/plat/prdfTargetServices.C

@@ -947,11 +947,17 @@ ExtensibleChip * getNeighborCore( ExtensibleChip * i_core )
     PRDF_ASSERT( nullptr != i_core );
 
     TargetHandle_t thisCore = i_core->getTrgt();
+    TargetHandleList parentEx = getConnected( thisCore, TYPE_EX );
+
+    // Check that there is still a functional parent EX
+    if (parentEx.size() == 0)
+        return nullptr;
+
     ExtensibleChip * neighborCore = nullptr;
-    TargetHandleList list =
-      getConnected(getConnectedParent(thisCore, TYPE_EX), TYPE_CORE);
 
-    for ( auto & trgt : list)
+    TargetHandleList coreList = getConnected( parentEx[0], TYPE_CORE);
+
+    for ( auto & trgt : coreList)
     {
         if ( trgt != thisCore )
         {