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Ndis 6.0 lwf: System hang after FilterPause return RRS feed

  • Question

  • I'm develop an Ndis 6.0 lwf driver. In FilterSendNetBufferLists and FilterReceiveNetBufferLists i will send or recv custom NBL. In FilterSendNetBufferListsComplete and FilterReturnNetBufferLists destory them. However, after running certain time, I try to uninstall driver, system will hang up after FilterPause return. I know in FilterPause should not send or recv packets any more, so in FilterSendNetBufferLists and FilterReceiveNetBufferLists add like this:

     FILTER_ACQUIRE_LOCK(&pFilter->Lock, DispatchLevel); 
     if (pFilter->State != FilterRunning) 
     { 
    	FILTER_RELEASE_LOCK(&pFilter->Lock, DispatchLevel); 
    	if (NDIS_TEST_RECEIVE_CAN_PEND(ReceiveFlags))
    		{ 
    			ReturnFlags = 0; 
    			if (NDIS_TEST_RECEIVE_AT_DISPATCH_LEVEL(ReceiveFlags)) 
    			{ 
    				NDIS_SET_RETURN_FLAG(ReturnFlags, NDIS_RETURN_FLAGS_DISPATCH_LEVEL); 
    			} 
    			NdisFReturnNetBufferLists(pFilter->FilterHandle, NetBufferLists, ReturnFlags); 
    		} 
    			break; 
    		}
    FILTER_RELEASE_LOCK(&pFilter->Lock, DispatchLevel);

    In FilterPause add this:

    if (pFilter->OutstandingRcvs > 0 || pFilter->OutstandingSends > 0) 
    { 
        NdisMSleep(5000000); 
    }
    But after this FilterPause return still hang. I notice that NdisMSleep(5000000); doesn't work(Not delay). why? Because FilterPause IRQL >= DISPATCH_LEVEL? (KeWaitForSingleObject doesn't sleep too.) What should i do to solve this issue? how can i wait all send or recv NBL finished? i'm dead end. Thanks for any help.

    Wednesday, August 17, 2016 6:55 AM

All replies

  • Hmm...  FILTER_RELEASE_LOCK executing twice  if (pFilter->State != FilterRunning)  ?

    Wednesday, August 17, 2016 12:02 PM
  • Thanks for replay.

    Sorry, It's  my fault, the code paste not correctly. break should jump out of while loop, the second FILTER_RELEASE_LOCK will not execute. Actually these code are MS filter sample code, should no problem. My issue is how to wait all send or recv NBL finished in FilterPause fuction, NdisMSleep doesn't work for me.

    Thursday, August 18, 2016 1:56 AM