Do nothing with error logs after shutdown event is received.

Disable processing of error logs by the error log server
after receiving the shutdown event.  This is to prevent
the possibility of bad things from happening once other
services are shutdown.

CQ: SW465848
Change-Id: I59c4951182d43a78f5704b4b4c3379f10dd03182
Reviewed-on: http://rchgit01.rchland.ibm.com/gerrit1/85278
Tested-by: Jenkins Server <pfd-jenkins+hostboot@us.ibm.com>
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>
Reviewed-by: Michael Baiocchi <mbaiocch@us.ibm.com>
Reviewed-by: Roland Veloz <rveloz@us.ibm.com>
Reviewed-by: Daniel M Crowell <dcrowell@us.ibm.com>

src/include/usr/errl/errlmanager.H

@@ -477,6 +477,11 @@ private:
      */
     bool        iv_pnorReadyForErrorLogs;
 
+    /**
+     *  @brief  Indicates if we have processed a shutdown event message
+     */
+    bool        iv_recvdShutdownEvent;
+
     /**
       * @brief
       * Pointer to the header that precedes the error log storage buffer

src/usr/errl/errlmanager.C

@@ -138,6 +138,7 @@ AtLoadFunctions atLoadFunction;
 ///////////////////////////////////////////////////////////////////////////////
 ErrlManager::ErrlManager() :
     iv_pnorReadyForErrorLogs(false),
+    iv_recvdShutdownEvent(false),
     iv_hwasProcessCalloutFn(NULL),
     iv_msgQ(NULL),
     iv_pnorAddr(NULL),
@@ -290,6 +291,30 @@ void ErrlManager::errlogMsgHndlr ()
         msg_t * theMsg = msg_wait( iv_msgQ );
         TRACFCOMP( g_trac_errl, INFO_MRK"Got an error log Msg - Type: 0x%08x",
                                                                theMsg->type );
+
+        // if we've been shut down then do nothing except delete the msg or send
+        // a response depending on the message type.
+        if(iv_recvdShutdownEvent)
+        {
+            TRACFCOMP( g_trac_errl, INFO_MRK "Error log service is shutdown. "
+                                             "Message will be ignored.");
+            switch( theMsg->type )
+            {
+                // Shutdown and flush message types expect a response
+                case ERRLOG_SHUTDOWN_TYPE:
+                case ERRLOG_FLUSH_TYPE:
+                    msg_respond ( iv_msgQ, theMsg );
+                    break;
+
+                // All other messages just need to be freed
+                default:
+                    msg_free(theMsg);
+                    break;
+            }
+            // wait for next message
+            continue;
+        }
+
         //Process message just received
         switch( theMsg->type )
         {
@@ -1029,6 +1054,9 @@ void ErrlManager::errlogShutdown()
     // prior to the PNOR resource provider shutting down.
     PNOR::flush(PNOR::HB_ERRLOGS);
 
+    // Remember that we have recieved the shutdown event
+    iv_recvdShutdownEvent = true;
+
     return;
 }