--- xnu/xnu-1504.9.26/iokit/Kernel/IOLocks.cpp
+++ xnu/xnu-1228/iokit/Kernel/IOLocks.cpp
@@ -25,6 +25,15 @@
  * 
  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  */
+/*
+ * Copyright (c) 1998 Apple Computer, Inc.  All rights reserved. 
+ *
+ * HISTORY
+ *
+ */
+
+
+#define	IOLOCKS_CPP	1
 
 #include <IOKit/system.h>
 
@@ -186,6 +195,7 @@
     int res;
 
     assert(lock->thread == IOThreadSelf());
+    assert(lock->count == 1 || interType == THREAD_UNINT);
     
     lock->count = 0;
     lock->thread = 0;
@@ -200,29 +210,6 @@
     return res;
 }
 
-int	IORecursiveLockSleepDeadline( IORecursiveLock * _lock, void *event,
-                                  AbsoluteTime deadline, UInt32 interType)
-{
-    _IORecursiveLock * lock = (_IORecursiveLock *)_lock;
-    UInt32 count = lock->count;
-    int res;
-
-    assert(lock->thread == IOThreadSelf());
-    
-    lock->count = 0;
-    lock->thread = 0;
-    res = lck_mtx_sleep_deadline(lock->mutex, LCK_SLEEP_DEFAULT, (event_t) event, 
-								 (wait_interrupt_t) interType, __OSAbsoluteTime(deadline));
-
-    // Must re-establish the recursive lock no matter why we woke up
-    // otherwise we would potentially leave the return path corrupted.
-    assert(lock->thread == 0);
-    assert(lock->count == 0);
-    lock->thread = IOThreadSelf();
-    lock->count = count;
-    return res;
-}
-
 void IORecursiveLockWakeup(IORecursiveLock *, void *event, bool oneThread)
 {
     thread_wakeup_prim((event_t) event, oneThread, THREAD_AWAKENED);