NetworkPkg/IScsiDxe: Set ExitBootServiceEvent to NULL after close it.

v2:
* Refine the commit log.

There are two place to close the ISCSI ExitBootServiceEvent:
#1.IScsiOnExitBootService(), which is the callback function of
   ExitBootServiceEvent.
#2.IScsiCleanDriverData(), which will be invoked by ISCSI driver
   binding stop().

So, the ExitBootServiceEvent will be closed and freed when exit boot
server is triggered. But it may be closed and freed again in ISCSI driver
binding stop(), which will result in the issue recorded at
https://bugzilla.tianocore.org/show_bug.cgi?id=742.

This patch is to resolve the issue.

Cc: Ye Ting <ting.ye@intel.com>
Cc: Fu Siyuan <siyuan.fu@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Wu Jiaxin <jiaxin.wu@intel.com>
Reviewed-by: Fu Siyuan <siyuan.fu@intel.com>

diff --git a/NetworkPkg/IScsiDxe/IScsiMisc.c b/NetworkPkg/IScsiDxe/IScsiMisc.c
index 9e4164c986bc58af794de0a93b168614ed4cf74a..94f3725866611763c70d557348e377a482a44e0d 100644 (file)
--- a/NetworkPkg/IScsiDxe/IScsiMisc.c
+++ b/NetworkPkg/IScsiDxe/IScsiMisc.c
@@ -1,7 +1,7 @@
 /** @file\r
   Miscellaneous routines for iSCSI driver.\r
 \r
-Copyright (c) 2004 - 2017, Intel Corporation. All rights reserved.<BR>\r
+Copyright (c) 2004 - 2018, Intel Corporation. All rights reserved.<BR>\r
 This program and the accompanying materials\r
 are licensed and made available under the terms and conditions of the BSD License\r
 which accompanies this distribution.  The full text of the license may be found at\r
@@ -1798,8 +1798,9 @@ IScsiCleanDriverData (
   }\r
 \r
 EXIT:\r
-\r
-  gBS->CloseEvent (Private->ExitBootServiceEvent);\r
+  if (Private->ExitBootServiceEvent != NULL) {\r
+    gBS->CloseEvent (Private->ExitBootServiceEvent); \r
+  }\r
 \r
   mCallbackInfo->Current = NULL;\r
 \r
@@ -2485,8 +2486,10 @@ IScsiOnExitBootService (
   ISCSI_DRIVER_DATA *Private;\r
 \r
   Private = (ISCSI_DRIVER_DATA *) Context;\r
+  \r
   gBS->CloseEvent (Private->ExitBootServiceEvent);\r
-\r
+  Private->ExitBootServiceEvent = NULL;\r
+  \r
   if (Private->Session != NULL) {\r
     IScsiSessionAbort (Private->Session);\r
   }\r