Multiple interrupt status bits can be active at the same time, process them
all instead of just one and ignoring the rest.
On an active network card, this would eventually cause all transmit buffers
to be marked "in use", blocking all transmits. Sinds no TCP acks would go out,
it would block TCP receives too.

Modified: trunk/reactos/drivers/net/dd/pcnet/pcnet.c

--- trunk/reactos/drivers/net/dd/pcnet/pcnet.c	2005-12-10 20:44:57 UTC (rev 20042)
+++ trunk/reactos/drivers/net/dd/pcnet/pcnet.c	2005-12-10 22:21:28 UTC (rev 20043)
@@ -87,11 +87,11 @@

           if (Data & CSR0_CERR)
             Adapter->Statistics.XmtCollisions++;
         }

-      else if(Data & CSR0_IDON)

+      if(Data & CSR0_IDON)

         {
           DPRINT("IDON\n");
         }

-      else if(Data & CSR0_RINT)

+      if(Data & CSR0_RINT)

         {
           DPRINT("receive interrupt\n");
 
@@ -147,7 +147,7 @@

               Adapter->Statistics.RcvGoodFrames++;
             }
         }

-      else if(Data & CSR0_TINT)

+      if(Data & CSR0_TINT)

         {
           PTRANSMIT_DESCRIPTOR Descriptor;
 
@@ -201,10 +201,9 @@

             }
           NdisMSendResourcesAvailable(Adapter->MiniportAdapterHandle);
         }

-      else

+      if(Data & ~(CSR0_ERR | CSR0_IDON | CSR0_RINT | CSR0_TINT))

         {

-          DPRINT1("UNHANDLED INTERRUPT\n");
-          ASSERT(FALSE);

+          DPRINT("UNHANDLED INTERRUPT CSR0 0x%x\n", Data);

         }
 
       NdisRawReadPortUshort(Adapter->PortOffset + RDP, &Data);
@@ -1081,7 +1080,7 @@

       (Adapter->CurrentTransmitEndIndex == NUMBER_OF_BUFFERS - 1 &&
        Adapter->CurrentTransmitStartIndex == 0))
     {

-      DPRINT("No free space in circular buffer\n");

+      DPRINT1("No free space in circular buffer\n");

       NdisDprReleaseSpinLock(&Adapter->Lock);
       return NDIS_STATUS_RESOURCES;
     }