--- xnu/xnu-3248.50.21/iokit/Kernel/IODMAEventSource.cpp
+++ xnu/xnu-2422.1.72/iokit/Kernel/IODMAEventSource.cpp
@@ -148,13 +148,6 @@
   return dmaController->validFIFODepth(dmaIndex, depth, direction);
 }
 
-
-IOReturn IODMAEventSource::setFrameSize(UInt8 byteCount)
-{
-  if ((dmaController == 0) || (dmaIndex == 0xFFFFFFFF)) return kIOReturnError;
-  
-  return dmaController->setFrameSize(dmaIndex, byteCount);
-}
 
 // protected