diff -r c7a0ce20c48c -r a77889bee936 kernel/eka/drivers/pbus/mmc/stack.cpp
--- a/kernel/eka/drivers/pbus/mmc/stack.cpp	Fri Aug 06 16:34:38 2010 +0100
+++ b/kernel/eka/drivers/pbus/mmc/stack.cpp	Thu Aug 12 11:55:14 2010 +0100
@@ -1804,9 +1804,11 @@
 	if( sessP->iCardP != NULL && sessP->iCardP->iUsingSessionP == sessP )
 		sessP->iCardP->iUsingSessionP = NULL;
 
-	// iAutoUnlockSession may attach to more than once card, so need to iterate 
+	// Some sessions may attach to more than once card, so need to iterate 
 	// through all cards and clear their session pointers if they match sessP
-	if (sessP == &iAutoUnlockSession)
+	if (sessP == &iAutoUnlockSession || 
+		sessP->iSessionID == ECIMLockUnlock || 
+		sessP->iSessionID == ECIMInitStackAfterUnlock)
 		{
 		for (TUint i = 0; i < iMaxCardsInStack; i++)
 			{
@@ -1942,6 +1944,11 @@
 
 			if(doCallback)
 				{
+				// Restore the callers card pointer as some state machines 
+				// (e.g. ECIMLockUnlock, ECIMInitStackAfterUnlock) can change it
+				sessP->RestoreCard();
+
+
 				// call media driver completion routine or StackSessionCBST().
 				sessP->iCallBack.CallBack();
 				}
@@ -6063,6 +6070,8 @@
 			return KMMCErrNotSupported;
 		    }
 
+		DoAddressCard(s.iCardP->iIndex-1);
+
 		s.iState |= KMMCSessStateInProgress;
 		m.SetTraps( KMMCErrInitContext );
 
@@ -6474,30 +6483,31 @@
 		// Upon completion, test the next card before performing further initialisation.
 		//
 		
-		SMF_STATE(EStSendStatus)
+		DoAddressCard(iAutoUnlockIndex); 	// Address the card
+		TMMCard* cd = iCardArray->CardP(iAutoUnlockIndex);
+		s.SetCard(cd);
+
+	SMF_STATE(EStSendStatus)
 		        
 		s.FillCommandDesc(ECmdSendStatus, 0);
 		                        
 		SMF_INVOKES(ExecCommandSMST,EStGetStatus)
 		                        
-		SMF_STATE(EStGetStatus)
+	SMF_STATE(EStGetStatus)
 		                        
 		const TMMCStatus st = s.LastStatus();
 		if((st & KMMCStatCardIsLocked) == 0)
 			{
-		    SMF_RETURN(err)
+			SMF_GOTOS(EStNextIndex);
 		    }
 		                        
-		SMF_STATE(EStUnlock)
+	SMF_STATE(EStUnlock)
 		                        
 		const TMapping *mp = NULL;
 		mp = iSocket->iPasswordStore->FindMappingInStore(iCardArray->CardP(iAutoUnlockIndex)->CID());
 
-		TMMCard &cd = *(iCardArray->CardP(iAutoUnlockIndex++));
-		OstTrace1( TRACE_INTERNALS, DMMCSTACK_CIMAUTOUNLOCKSM4, "Attempting to unlock card %d", cd.Number() );
+		OstTrace1( TRACE_INTERNALS, DMMCSTACK_CIMAUTOUNLOCKSM4, "Attempting to unlock card %d", iCardArray->CardP(iAutoUnlockIndex)->Number() );
 		
-		s.SetCard(&cd);
-
 		const TInt kPWD_LEN = mp->iPWD.Length();
 		iPSLBuf[0] = 0;				// LOCK_UNLOCK = 0; unlock
 		iPSLBuf[1] = static_cast<TUint8>(kPWD_LEN);
@@ -6774,6 +6784,21 @@
 	return busWidth;
 	}
 
+void DMMCStack::DoAddressCard(TInt aCardNumber)
+	{
+	MAddressCard* addressCardInterface = NULL;
+	GetInterface(KInterfaceAddressCard, (MInterface*&) addressCardInterface);
+	if (addressCardInterface)
+		addressCardInterface->AddressCard(aCardNumber);
+	else
+		{
+		// if the interface isn't supported on a multiplexed bus, then panic if the card number > 0 - 
+		// one cause of this panic is if the PSL 's implementation of GetInterface() does not call the 
+		// base class's implementation of GetInterface()
+		__ASSERT_ALWAYS((!iMultiplexedBus) || (aCardNumber <= 0), DMMCSocket::Panic(DMMCSocket::EMMCAddressCardNotSupported));
+		}
+	}
+
 /**
  * class DMMCSocket 
  */