--- xnu/xnu-1228.15.4/iokit/Kernel/IOInterruptController.cpp
+++ xnu/xnu-792.6.56/iokit/Kernel/IOInterruptController.cpp
@@ -1,19 +1,14 @@
 /*
  * Copyright (c) 1998-2000 Apple Computer, Inc. All rights reserved.
  *
- * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
+ * @APPLE_LICENSE_HEADER_START@
  * 
  * 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. The rights granted to you under the License
- * may not be used to create, or enable the creation or redistribution of,
- * unlawful or unlicensed copies of an Apple operating system, or to
- * circumvent, violate, or enable the circumvention or violation of, any
- * terms of an Apple operating system software license agreement.
- * 
- * Please obtain a copy of the License at
- * http://www.opensource.apple.com/apsl/ and read it before using this file.
+ * 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
@@ -23,7 +18,7 @@
  * Please see the License for the specific language governing rights and
  * limitations under the License.
  * 
- * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
+ * @APPLE_LICENSE_HEADER_END@
  */
 /*
  * Copyright (c) 1999 Apple Computer, Inc.  All rights reserved. 
@@ -87,15 +82,6 @@
   // Check if the interrupt source can/should be shared.
   canBeShared = vectorCanBeShared(vectorNumber, vector);
   IODTGetInterruptOptions(nub, source, &options);
-#if defined(__i386__) || defined(__x86_64__)
-  int   interruptType;
-  if (OSDynamicCast(IOPlatformDevice, getProvider()) &&
-      (getInterruptType(nub, source, &interruptType) == kIOReturnSuccess) &&
-      (kIOInterruptTypeLevel & interruptType))
-  {
-    options |= kIODTInterruptShared;
-  }
-#endif
   shouldBeShared = canBeShared && (options & kIODTInterruptShared);
   wasAlreadyRegisterd = vector->interruptRegistered;
   
@@ -442,8 +428,6 @@
   _numInterruptSources = 1;
   
   // Set up the IOInterruptSource to point at this.
-  parentController->retain();
-  parentSource->retain();
   _interruptSources[0].interruptController = parentController;
   _interruptSources[0].vectorData = parentSource;
   
@@ -683,8 +667,7 @@
 
 IOInterruptAction IOSharedInterruptController::getInterruptHandlerAddress(void)
 {
-    return OSMemberFunctionCast(IOInterruptAction,
-			this, &IOSharedInterruptController::handleInterrupt);
+    return (IOInterruptAction)&IOSharedInterruptController::handleInterrupt;
 }
 
 IOReturn IOSharedInterruptController::handleInterrupt(void * /*refCon*/,