--- xnu/xnu-4570.41.2/iokit/Kernel/IOLocks.cpp
+++ xnu/xnu-1504.7.4/iokit/Kernel/IOLocks.cpp
@@ -37,11 +37,6 @@
 extern "C" {
 #include <kern/locks.h>
 
-#if defined(__x86_64__)
-/* Synthetic event if none is specified, for backwards compatibility only. */
-static bool IOLockSleep_NO_EVENT __attribute__((used)) = 0;
-#endif
-
 void	IOLockInitWithState( IOLock * lock, IOLockState state)
 {
     if( state == kIOLockStateLocked)
@@ -65,13 +60,13 @@
 
 int	IOLockSleep( IOLock * lock, void *event, UInt32 interType)
 {
-    return (int) lck_mtx_sleep(lock, LCK_SLEEP_PROMOTED_PRI, (event_t) event, (wait_interrupt_t) interType);
+    return (int) lck_mtx_sleep(lock, LCK_SLEEP_DEFAULT, (event_t) event, (wait_interrupt_t) interType);
 }
 
 int	IOLockSleepDeadline( IOLock * lock, void *event,
                                 AbsoluteTime deadline, UInt32 interType)
 {
-    return (int) lck_mtx_sleep_deadline(lock, LCK_SLEEP_PROMOTED_PRI, (event_t) event,
+    return (int) lck_mtx_sleep_deadline(lock, LCK_SLEEP_DEFAULT, (event_t) event,
     					(wait_interrupt_t) interType, __OSAbsoluteTime(deadline));
 }
 
@@ -81,45 +76,8 @@
 }   
 
 
-#if defined(__x86_64__)
-/*
- * For backwards compatibility, kexts built against pre-Darwin 14 headers will bind at runtime to this function,
- * which supports a NULL event,
- */
-int	IOLockSleep_legacy_x86_64( IOLock * lock, void *event, UInt32 interType) __asm("_IOLockSleep");
-int	IOLockSleepDeadline_legacy_x86_64( IOLock * lock, void *event,
-					   AbsoluteTime deadline, UInt32 interType) __asm("_IOLockSleepDeadline");
-void	IOLockWakeup_legacy_x86_64(IOLock * lock, void *event, bool oneThread) __asm("_IOLockWakeup");
-
-int	IOLockSleep_legacy_x86_64( IOLock * lock, void *event, UInt32 interType)
-{
-    if (event == NULL)
-        event = (void *)&IOLockSleep_NO_EVENT;
-
-    return IOLockSleep(lock, event, interType);
-}
-
-int	IOLockSleepDeadline_legacy_x86_64( IOLock * lock, void *event,
-			     AbsoluteTime deadline, UInt32 interType)
-{
-    if (event == NULL)
-        event = (void *)&IOLockSleep_NO_EVENT;
-
-    return IOLockSleepDeadline(lock, event, deadline, interType);
-}
-
-void	IOLockWakeup_legacy_x86_64(IOLock * lock, void *event, bool oneThread)
-{   
-    if (event == NULL)
-        event = (void *)&IOLockSleep_NO_EVENT;
-
-    IOLockWakeup(lock, event, oneThread);
-}   
-#endif /* defined(__x86_64__) */
-
-
 struct _IORecursiveLock {
-	lck_mtx_t	mutex;
+	lck_mtx_t	*mutex;
 	lck_grp_t	*group;
 	thread_t	thread;
 	UInt32		count;
@@ -136,10 +94,15 @@
     if( !lock )
         return( 0 );
 
-    lck_mtx_init( &lock->mutex, lockGroup, LCK_ATTR_NULL );
-    lock->group = lockGroup;
-    lock->thread = 0;
-    lock->count  = 0;
+    lock->mutex = lck_mtx_alloc_init( lockGroup, LCK_ATTR_NULL );
+    if( lock->mutex ) {
+		lock->group = lockGroup;
+        lock->thread = 0;
+        lock->count  = 0;
+    } else {
+        IODelete( lock, _IORecursiveLock, 1 );
+        lock = 0;
+    }
 
     return( (IORecursiveLock *) lock );
 }
@@ -154,13 +117,13 @@
 {
     _IORecursiveLock * lock = (_IORecursiveLock *)_lock;
 	
-    lck_mtx_destroy(&lock->mutex, lock->group);
+    lck_mtx_free( lock->mutex, lock->group );
     IODelete( lock, _IORecursiveLock, 1 );
 }
 
 lck_mtx_t * IORecursiveLockGetMachLock( IORecursiveLock * lock )
 {
-    return( &lock->mutex );
+    return( lock->mutex );
 }
 
 void IORecursiveLockLock( IORecursiveLock * _lock)
@@ -170,7 +133,7 @@
     if( lock->thread == IOThreadSelf())
         lock->count++;
     else {
-        lck_mtx_lock( &lock->mutex );
+        lck_mtx_lock( lock->mutex );
         assert( lock->thread == 0 );
         assert( lock->count == 0 );
         lock->thread = IOThreadSelf();
@@ -186,7 +149,7 @@
         lock->count++;
 	return( true );
     } else {
-        if( lck_mtx_try_lock( &lock->mutex )) {
+        if( lck_mtx_try_lock( lock->mutex )) {
             assert( lock->thread == 0 );
             assert( lock->count == 0 );
             lock->thread = IOThreadSelf();
@@ -205,7 +168,7 @@
 
     if( 0 == (--lock->count)) {
         lock->thread = 0;
-        lck_mtx_unlock( &lock->mutex );
+        lck_mtx_unlock( lock->mutex );
     }
 }
 
@@ -226,7 +189,7 @@
     
     lock->count = 0;
     lock->thread = 0;
-    res = lck_mtx_sleep(&lock->mutex, LCK_SLEEP_PROMOTED_PRI, (event_t) event, (wait_interrupt_t) interType);
+    res = lck_mtx_sleep(lock->mutex, LCK_SLEEP_DEFAULT, (event_t) event, (wait_interrupt_t) interType);
 
     // Must re-establish the recursive lock no matter why we woke up
     // otherwise we would potentially leave the return path corrupted.
@@ -248,8 +211,8 @@
     
     lock->count = 0;
     lock->thread = 0;
-    res = lck_mtx_sleep_deadline(&lock->mutex, LCK_SLEEP_PROMOTED_PRI, (event_t) event,
-								      (wait_interrupt_t) interType, __OSAbsoluteTime(deadline));
+    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.
@@ -309,30 +272,6 @@
     return( (lck_spin_t *)lock);
 }
 
-#ifndef IOLOCKS_INLINE
-/*
- * Lock assertions
- */
-
-void
-IOLockAssert(IOLock * lock, IOLockAssertState type)
-{
-    LCK_MTX_ASSERT(lock, type);
-}
-
-void
-IORWLockAssert(IORWLock * lock, IORWLockAssertState type)
-{
-    LCK_RW_ASSERT(lock, type);
-}
-
-void
-IOSimpleLockAssert(IOSimpleLock *lock, IOSimpleLockAssertState type)
-{
-    LCK_SPIN_ASSERT(l, type);
-}
-#endif /* !IOLOCKS_INLINE */
-
 } /* extern "C" */