--- xnu/xnu-517.9.5/iokit/Kernel/IOUserClient.cpp
+++ xnu/xnu-517/iokit/Kernel/IOUserClient.cpp
@@ -3,19 +3,22 @@
  *
  * @APPLE_LICENSE_HEADER_START@
  * 
- * The contents of this file constitute Original Code as defined in and
- * are subject to the Apple Public Source License Version 1.1 (the
- * "License").  You may not use this file except in compliance with the
- * License.  Please obtain a copy of the License at
- * http://www.apple.com/publicsource and read it before using this file.
+ * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
  * 
- * This Original Code and all software distributed under the License are
- * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this
+ * file.
+ * 
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
- * License for the specific language governing rights and limitations
- * under the License.
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
  * 
  * @APPLE_LICENSE_HEADER_END@
  */
@@ -383,7 +386,7 @@
         OSNotificationHeader		notifyHeader;
     };
 
-    enum { kMaxOutstanding = 1024 };
+    enum { kMaxOutstanding = 256 };
 
     PingMsg *		pingMsg;
     vm_size_t		msgSize;
@@ -1963,33 +1966,6 @@
 	err = kIOReturnBadArgument;
 
     return( err );
-}
-
-IOMemoryMap * IOUserClient::removeMappingForDescriptor(IOMemoryDescriptor * mem)
-{
-    OSIterator *  iter;
-    IOMemoryMap * map = 0;
-
-    IOLockLock(gIOObjectPortLock);
-
-    iter = OSCollectionIterator::withCollection(mappings);
-    if(iter)
-    {
-        while ((map = OSDynamicCast(IOMemoryMap, iter->getNextObject())))
-        {
-            if(mem == map->getMemoryDescriptor())
-            {
-                map->retain();
-                mappings->removeObject(map);
-                break;
-            }
-        }
-        iter->release();
-    }
-
-    IOLockUnlock(gIOObjectPortLock);
-
-    return (map);
 }
 
 kern_return_t is_io_connect_unmap_memory(