--- xnu/xnu-12377.121.6/iokit/Kernel/IODMAEventSource.cpp
+++ xnu/xnu-6153.11.26/iokit/Kernel/IODMAEventSource.cpp
@@ -26,8 +26,6 @@
  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  */
 
-#define IOKIT_ENABLE_SHARED_PTR
-
 #include <IOKit/IODMAEventSource.h>
 #include <IOKit/IOService.h>
 
@@ -59,10 +57,11 @@
 	dmaCompletionAction = inCompletion;
 	dmaNotificationAction = inNotification;
 
-	dmaController.reset(IODMAController::getController(dmaProvider, inDMAIndex), OSRetain);
+	dmaController = IODMAController::getController(dmaProvider, inDMAIndex);
 	if (dmaController == NULL) {
 		return false;
 	}
+	dmaController->retain();
 
 	result = dmaController->initDMAChannel(dmaProvider, this, &dmaIndex, inDMAIndex);
 	if (result != kIOReturnSuccess) {
@@ -84,17 +83,18 @@
 	super::free();
 }
 
-OSSharedPtr<IODMAEventSource>
+IODMAEventSource *
 IODMAEventSource::dmaEventSource(OSObject *inOwner,
     IOService *inProvider,
     Action inCompletion,
     Action inNotification,
     UInt32 inDMAIndex)
 {
-	OSSharedPtr<IODMAEventSource> dmaES = OSMakeShared<IODMAEventSource>();
+	IODMAEventSource *dmaES = new IODMAEventSource;
 
 	if (dmaES && !dmaES->init(inOwner, inProvider, inCompletion, inNotification, inDMAIndex)) {
-		return nullptr;
+		dmaES->release();
+		return NULL;
 	}
 
 	return dmaES;