--- xnu/xnu-124.13/iokit/Kernel/IOMemoryDescriptor.cpp
+++ xnu/xnu-124.1/iokit/Kernel/IOMemoryDescriptor.cpp
@@ -787,7 +787,7 @@
         if(forDirection == kIODirectionNone)
             forDirection = _direction;
 
-        vm_prot_t access = VM_PROT_DEFAULT;    // Could be cleverer using direction
+        vm_prot_t access = VM_PROT_DEFAULT;	// Could be cleverer using direction
 
         //
         // Check user read/write access to the data buffer.
@@ -1055,7 +1055,6 @@
 // osfmk/device/iokit_rpc.c
 extern kern_return_t IOMapPages( vm_map_t map, vm_offset_t va, vm_offset_t pa,
                                  vm_size_t length, unsigned int mapFlags);
-extern kern_return_t IOUnmapPages(vm_map_t map, vm_offset_t va, vm_size_t length);
 };
 
 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
@@ -1123,9 +1122,6 @@
 	IOOptionBits		options,
         IOByteCount		offset,
         IOByteCount		length );
-
-    IOReturn redirect(
-	task_t			intoTask, bool redirect );
 };
 
 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
@@ -1208,8 +1204,7 @@
 						 options, offset, length ));
     if( !ok) {
 	logical = 0;
-        memory->release();
-        memory = 0;
+        _memory->release();
         vm_map_deallocate(addressMap);
         addressMap = 0;
     }
@@ -1329,71 +1324,6 @@
         err = vm_deallocate( addressMap, logical, length );
     else
         err = kIOReturnSuccess;
-
-    return( err );
-}
-
-IOReturn IOMemoryDescriptor::redirect( task_t safeTask, bool redirect )
-{
-    IOReturn		err;
-    _IOMemoryMap *	mapping = 0;
-    OSIterator *	iter;
-
-    LOCK;
-
-    do {
-	if( (iter = OSCollectionIterator::withCollection( _mappings))) {
-            while( (mapping = (_IOMemoryMap *) iter->getNextObject()))
-                mapping->redirect( safeTask, redirect );
-
-            iter->release();
-        }
-    } while( false );
-
-    UNLOCK;
-
-    // temporary binary compatibility
-    IOSubMemoryDescriptor * subMem;
-    if( (subMem = OSDynamicCast( IOSubMemoryDescriptor, this)))
-        err = subMem->redirect( safeTask, redirect );
-    else
-        err = kIOReturnSuccess;
-
-    return( err );
-}
-
-IOReturn IOSubMemoryDescriptor::redirect( task_t safeTask, bool redirect )
-{
-// temporary binary compatibility   IOMemoryDescriptor::redirect( safeTask, redirect );
-    return( _parent->redirect( safeTask, redirect ));
-}
-
-IOReturn _IOMemoryMap::redirect( task_t safeTask, bool redirect )
-{
-    IOReturn err = kIOReturnSuccess;
-
-    if( superMap) {
-//        err = ((_IOMemoryMap *)superMap)->redirect( safeTask, redirect );
-    } else {
-
-        LOCK;
-        if( logical && addressMap
-        && (get_task_map( safeTask) != addressMap)
-        && (0 == (options & kIOMapStatic))) {
-    
-            IOUnmapPages( addressMap, logical, length );
-            if( !redirect) {
-                err = vm_deallocate( addressMap, logical, length );
-                err = memory->doMap( addressMap, &logical,
-                                     (options & ~kIOMapAnywhere) /*| kIOMapReserve*/ );
-            } else
-                err = kIOReturnSuccess;
-#ifdef DEBUG
-            IOLog("IOMemoryMap::redirect(%d, %x) %x from %lx\n", redirect, err, logical, addressMap);
-#endif
-        }
-        UNLOCK;
-    }
 
     return( err );
 }