[jimtabor] 57047: [NtUser] - Fix empty list error and add a note.

Author: jimtabor
Date: Mon Aug  6 05:04:15 2012
New Revision: 57047
URL: http://svn.reactos.org/svn/reactos?rev=57047&view=rev
Log:
[NtUser] - Fix empty list error and add a note.
Modified:
    trunk/reactos/win32ss/user/ntuser/input.c
Modified: trunk/reactos/win32ss/user/ntuser/input.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/win32ss/user/ntuser/input.…
==============================================================================
--- trunk/reactos/win32ss/user/ntuser/input.c [iso-8859-1] (original)
+++ trunk/reactos/win32ss/user/ntuser/input.c [iso-8859-1] Mon Aug  6 05:04:15 2012
@@ -429,6 +429,10 @@
             ptiFrom->rpdesk != ptiTo->rpdesk)
         return FALSE;
+    /* MSDN Note:
+       Keyboard and mouse events received by both threads are processed by the thread
specifie
+     */
+
     /* If Attach set, allocate and link. */
     if (fAttach)
     {
@@ -475,6 +479,7 @@
         if (!pai) return FALSE;
         if (paiprev) paiprev->paiNext = pai->paiNext;
+        else if (!pai->paiNext) gpai = NULL;
         ExFreePoolWithTag(pai, USERTAG_ATTACHINFO);
         ERR("Attach Free! ptiFrom 0x%p  ptiTo 0x%p\n",ptiFrom,ptiTo);