diff -r 43365a9b78a3 -r d8d70de2bd36 kernel/eka/include/drivers/dma_v2.h
--- a/kernel/eka/include/drivers/dma_v2.h	Tue Jul 06 15:50:07 2010 +0300
+++ b/kernel/eka/include/drivers/dma_v2.h	Wed Aug 18 11:08:29 2010 +0300
@@ -42,13 +42,24 @@
 #ifdef _DEBUG
 #define __DMA_CANT_HAPPEN() Kern::Fault(KDmaPanicCat, __LINE__)
 #define __DMA_DECLARE_INVARIANT public: void Invariant();
+#define __DMA_DECLARE_VIRTUAL_INVARIANT public: virtual void Invariant();
 #define __DMA_INVARIANT() Invariant()
 #else
 #define __DMA_CANT_HAPPEN()
 #define __DMA_DECLARE_INVARIANT
+#define __DMA_DECLARE_VIRTUAL_INVARIANT
 #define __DMA_INVARIANT()
 #endif
 
+#ifdef __DMASIM__
+#ifdef __PRETTY_FUNCTION__
+#define __DMA_UNREACHABLE_DEFAULT() DMA_PSL_TRACE1("Calling default virtual: %s", __PRETTY_FUNCTION__)
+#else
+#define __DMA_UNREACHABLE_DEFAULT() DMA_PSL_TRACE("Calling default virtual function")
+#endif
+#else
+#define __DMA_UNREACHABLE_DEFAULT() __DMA_CANT_HAPPEN()
+#endif
 
 //////////////////////////////////////////////////////////////////////////////
 // INTERFACE EXPOSED TO DEVICE-DRIVERS
@@ -637,7 +648,7 @@
 private:
 	inline void OnDeque();
 	TInt CheckTransferConfig(const TDmaTransferConfig& aTarget, TUint aCount) const;
-	TInt CheckMemFlags(const TDmaTransferConfig& aTarget, TUint aCount) const;
+	TInt CheckMemFlags(const TDmaTransferConfig& aTarget) const;
 	TInt AdjustFragmentSize(TUint& aFragSize, TUint aElementSize, TUint aFrameSize);
 	TUint GetTransferCount(const TDmaTransferArgs& aTransferArgs) const;
 	TUint GetMaxTransferlength(const TDmaTransferArgs& aTransferArgs, TUint aCount) const;
@@ -738,11 +749,6 @@
 		TInt iDesCount;
 		/** DFC queue used to service DMA interrupts.
 
-			The DFC thread priority must be higher than any client thread
-			priority to avoid a situation where a transfer completes while
-			being cancelled and another transfer is started before the DFC
-			thread gets a chance to run. This would lead to a stray DFC.
-
 			@released
 		*/
 		TDfcQue* iDfcQ;
@@ -1232,15 +1238,16 @@
 		void TFooDmaChannel::QueuedRequestCountChanged()
 			{
 			Kern::MutexWait(*iDmaMutex);
-			if ((iQueuedRequests > 0) && (iPrevQueuedRequests == 0))
+			const TInt queued_now = __e32_atomic_load_acq32(&iQueuedRequests);
+			if ((queued_now > 0) && (iPrevQueuedRequests == 0))
 				{
 				IncreasePowerCount(); // Base port specific
 				}
-			else if ((iQueuedRequests == 0) && (iPrevQueuedRequests > 0))
+			else if ((queued_now == 0) && (iPrevQueuedRequests > 0))
 				{
 				DecreasePowerCount(); // Base port specific
 				}
-			iPrevQueuedRequests = iQueuedRequests;
+			iPrevQueuedRequests = queued_now;
 			Kern::MutexSignal(*iDmaMutex);
 			}
 
@@ -1250,17 +1257,18 @@
 	*/
 	virtual void QueuedRequestCountChanged();
 
-#if defined(__CPU_ARM) && !defined(__EABI__)
-	inline virtual ~TDmaChannel() {}	// kill really annoying warning
-#endif
+	virtual void SetNullPtr(const DDmaRequest& aReq);
+	virtual void ResetNullPtr();
+
+	inline virtual ~TDmaChannel() {}
+
+	inline void Wait();
+	inline void Signal();
+	inline TBool Flash();
 
 private:
 	static void Dfc(TAny*);
 	void DoDfc();
-	inline void Wait();
-	inline void Signal();
-	inline TBool Flash();
-	void ResetStateMachine();
 
 protected:
 	TDmac* iController;		 // DMAC this channel belongs to (NULL when closed)
@@ -1281,13 +1289,14 @@
 	SDblQue iReqQ;			// being/about to be transferred request queue
 	TInt iReqCount;			// number of requests attached to this channel
 	TInt iQueuedRequests; 	// number of requests currently queued on this channel
+	TBool iCallQueuedRequestFn;	// call QueuedRequestCountChanged? (default: true)
 
 private:
 	TDmaCancelInfo* iCancelInfo; // ...
 	TBool iRedoRequest;		// client ISR callback wants a redo of request
 	TBool iIsrCbRequest;	// request on queue using ISR callback
 
-	__DMA_DECLARE_INVARIANT
+	__DMA_DECLARE_VIRTUAL_INVARIANT
 	};