--- xnu/xnu-344.49/iokit/Kernel/IOInterruptController.cpp
+++ xnu/xnu-124.7/iokit/Kernel/IOInterruptController.cpp
@@ -3,22 +3,19 @@
  *
  * @APPLE_LICENSE_HEADER_START@
  * 
- * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
+ * 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.
  * 
- * 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
+ * This 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, QUIET ENJOYMENT OR NON-INFRINGEMENT.
- * Please see the License for the specific language governing rights and
- * limitations under the License.
+ * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
+ * License for the specific language governing rights and limitations
+ * under the License.
  * 
  * @APPLE_LICENSE_HEADER_END@
  */
@@ -99,10 +96,10 @@
       originalNub = vector->nub;
       originalSource = vector->source;
       
-      // Physically disable the interrupt, but mark it as being enables in the hardware.
-      // The interruptDisabledSoft now indicates the driver's request for enablement.
-      disableVectorHard(vectorNumber, vector);
-      vector->interruptDisabledHard = 0;
+      // Save the dis/enable state for the original consumer's interrupt.
+      // Then disable the source
+      wasDisabledSoft = vector->interruptDisabledSoft;
+      disableInterrupt(originalNub, originalSource);
       
       // Initialize the new shared interrupt controller.
       error = vector->sharedController->initInterruptController(this,
@@ -128,17 +125,7 @@
       // put the original consumor's interrupt back to normal and
       // get rid of whats left of the shared controller.
       if (error != kIOReturnSuccess) {
-	// Save the driver's interrupt enablement state.
-	wasDisabledSoft = vector->interruptDisabledSoft;
-	
-	// Make the interrupt really hard disabled.
-	vector->interruptDisabledSoft = 1;
-	vector->interruptDisabledHard = 1;
-	
-	// Enable the original consumer's interrupt if needed.
-	if (!wasDisabledSoft) originalNub->enableInterrupt(originalSource);
         enableInterrupt(originalNub, originalSource);
-	
         vector->sharedController->release();
         vector->sharedController = 0;
         IOUnlock(vector->interruptLock);
@@ -151,13 +138,6 @@
       vector->source  = 0;
       vector->target  = vector->sharedController;
       vector->refCon  = 0;
-      
-      // Save the driver's interrupt enablement state.
-      wasDisabledSoft = vector->interruptDisabledSoft;
-      
-      // Make the interrupt really hard disabled.
-      vector->interruptDisabledSoft = 1;
-      vector->interruptDisabledHard = 1;
       
       // Enable the original consumer's interrupt if needed.
       if (!wasDisabledSoft) originalNub->enableInterrupt(originalSource);
@@ -264,17 +244,7 @@
   
   if (vector->interruptDisabledSoft) {
     vector->interruptDisabledSoft = 0;
-#if __ppc__
-    sync();
-    isync();
-#endif
-    
-    if (!getPlatform()->atInterruptLevel()) {
-      while (vector->interruptActive);
-#if __ppc__
-      isync();
-#endif
-    }
+    
     if (vector->interruptDisabledHard) {
       vector->interruptDisabledHard = 0;
       
@@ -419,7 +389,7 @@
   }
   
   // Allocate the memory for the vectors
-  numVectors = 32; // For now a constant number.
+  numVectors = 8; // For now a constant number.
   vectors = (IOInterruptVector *)IOMalloc(numVectors * sizeof(IOInterruptVector));
   if (vectors == NULL) {
     IOFree(_interruptSources, sizeof(IOInterruptSource));
@@ -576,26 +546,24 @@
   long              vectorNumber;
   IOInterruptVector *vector;
   OSData            *vectorData;
-  IOInterruptState  interruptState;
-  
-  interruptSources = nub->_interruptSources;
-  vectorData = interruptSources[source].vectorData;
-  vectorNumber = *(long *)vectorData->getBytesNoCopy();
-  vector = &vectors[vectorNumber];
-  
-  interruptState = IOSimpleLockLockDisableInterrupt(controllerLock);
-  if (!vector->interruptDisabledSoft) {
+  IOInterruptState  interruptState;;
+  
+  interruptSources = nub->_interruptSources;
+  vectorData = interruptSources[source].vectorData;
+  vectorNumber = *(long *)vectorData->getBytesNoCopy();
+  vector = &vectors[vectorNumber];
+  
+  if (vector->interruptDisabledSoft) {
+    vector->interruptDisabledSoft = 0;
+    
+    interruptState = IOSimpleLockLockDisableInterrupt(controllerLock);
+    vectorsEnabled++;
     IOSimpleLockUnlockEnableInterrupt(controllerLock, interruptState);
-    return kIOReturnSuccess;
-  }
-  
-  vector->interruptDisabledSoft = 0;
-  vectorsEnabled++;
-  IOSimpleLockUnlockEnableInterrupt(controllerLock, interruptState);
-  
-  if (controllerDisabled && (vectorsEnabled == vectorsRegistered)) {
-    controllerDisabled = 0;
-    provider->enableInterrupt(0);
+    
+    if (controllerDisabled && (vectorsEnabled == vectorsRegistered)) {
+      controllerDisabled = 0;
+      provider->enableInterrupt(0);
+    }
   }
   
   return kIOReturnSuccess;
@@ -608,23 +576,24 @@
   long              vectorNumber;
   IOInterruptVector *vector;
   OSData            *vectorData;
-  IOInterruptState  interruptState;
-  
-  interruptSources = nub->_interruptSources;
-  vectorData = interruptSources[source].vectorData;
-  vectorNumber = *(long *)vectorData->getBytesNoCopy();
-  vector = &vectors[vectorNumber];
-  
-  interruptState = IOSimpleLockLockDisableInterrupt(controllerLock); 
+  IOInterruptState  interruptState;;
+  
+  interruptSources = nub->_interruptSources;
+  vectorData = interruptSources[source].vectorData;
+  vectorNumber = *(long *)vectorData->getBytesNoCopy();
+  vector = &vectors[vectorNumber];
+  
   if (!vector->interruptDisabledSoft) {
     vector->interruptDisabledSoft = 1;
 #if __ppc__
     sync();
     isync();
 #endif
+    
+    interruptState = IOSimpleLockLockDisableInterrupt(controllerLock); 
     vectorsEnabled--;
-  }
-  IOSimpleLockUnlockEnableInterrupt(controllerLock, interruptState);
+    IOSimpleLockUnlockEnableInterrupt(controllerLock, interruptState);
+  }
   
   if (!getPlatform()->atInterruptLevel()) {
     while (vector->interruptActive);