--- xnu/xnu-3248.50.21/iokit/Kernel/IOInterruptController.cpp
+++ xnu/xnu-1699.24.8/iokit/Kernel/IOInterruptController.cpp
@@ -1,6 +1,5 @@
 /*
- * Copyright (c) 2007-2012 Apple Inc. All rights reserved.
- * Copyright (c) 1998-2006 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 1998-2010 Apple Inc. All rights reserved.
  *
  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
  * 
@@ -291,10 +290,7 @@
   
   if (vector->interruptDisabledSoft) {
     vector->interruptDisabledSoft = 0;
-#if !defined(__i386__) && !defined(__x86_64__)
-    OSMemoryBarrier();
-#endif
-
+    
     if (!getPlatform()->atInterruptLevel()) {
       while (vector->interruptActive)
 	{}
@@ -322,9 +318,6 @@
   vector = &vectors[vectorNumber];
   
   vector->interruptDisabledSoft = 1;
-#if !defined(__i386__) && !defined(__x86_64__)
-  OSMemoryBarrier();
-#endif
   
   if (!getPlatform()->atInterruptLevel()) {
     while (vector->interruptActive)
@@ -418,8 +411,6 @@
 {
   int      cnt, interruptType;
   IOReturn error;
-
-  reserved = NULL;
   
   if (!super::init())
     return kIOReturnNoResources;
@@ -653,10 +644,6 @@
   interruptState = IOSimpleLockLockDisableInterrupt(controllerLock); 
   if (!vector->interruptDisabledSoft) {
     vector->interruptDisabledSoft = 1;
-#if !defined(__i386__) && !defined(__x86_64__)
-    OSMemoryBarrier();
-#endif
-
     vectorsEnabled--;
   }
   IOSimpleLockUnlockEnableInterrupt(controllerLock, interruptState);
@@ -686,10 +673,6 @@
     vector = &vectors[vectorNumber];
     
     vector->interruptActive = 1;
-#if !defined(__i386__) && !defined(__x86_64__)
-    OSMemoryBarrier();
-#endif
-
 	if (!vector->interruptDisabledSoft) {
 	  
 	  // Call the handler if it exists.