--- a/kernel/eka/include/drivers/dma_v1.h	Tue Jul 06 15:50:07 2010 +0300
+++ b/kernel/eka/include/drivers/dma_v1.h	Wed Aug 18 11:08:29 2010 +0300
@@ -279,13 +279,7 @@
 		TUint32 iCookie;
 		/** Number of descriptors this channel can use */
 		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.
-		*/
+		/** DFC queue used to service DMA interrupts */
 		TDfcQue* iDfcQ;
 		/** DFC priority */
 		TUint8 iDfcPriority;
@@ -393,15 +387,16 @@
 		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);
 			}
 
@@ -436,6 +431,7 @@
 	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;
 	__DMA_DECLARE_INVARIANT