EMAC Receive Problem

DWORD EMACReceive( DWORD *EMACBuf )
{
  DWORD RxProduceIndex, RxConsumeIndex;
  DWORD RxLength = 0;
  DWORD Counter = 0;

  /* the input parameter, EMCBuf, needs to be word aligned */
  RxProduceIndex = MAC_RXPRODUCEINDEX;
  RxConsumeIndex = MAC_RXCONSUMEINDEX;

  if ( RxProduceIndex == EMAC_RX_DESCRIPTOR_COUNT )
  {
        /* reach the limit, that probably should never happen */
        MAC_RXPRODUCEINDEX = 0;
        CurrentRxPtr = EMAC_RX_BUFFER_ADDR;
  }

  /* a packet has arrived. */
  if ( RxProduceIndex != RxConsumeIndex )
  {
        if ( RxProduceIndex < RxConsumeIndex )       /* Wrapped around already */
        {
          /* take care of unwrapped, RxConsumeIndex to EMAC_RX_DESCERIPTOR_COUNT */
          RxLength += EMACReceiveFractions( RxConsumeIndex, EMAC_RX_DESCRIPTOR_COUNT );
          Counter++;
          PacketReceived = TRUE;

          /* then take care of wrapped, 0 to RxProduceIndex */
          if ( RxProduceIndex > 0 )
          {
                RxLength += EMACReceiveFractions( 0, RxProduceIndex );
                Counter++;
          }
        }
        else                                    /* Normal process */
        {
            RxLength += EMACReceiveFractions( RxConsumeIndex, RxProduceIndex );
                Counter++;
        }
  }
  return( RxLength );
}

#define MAC_RXPRODUCEINDEX  (*(volatile unsigned long *)(MAC_BASE_ADDR + 0x114)) /* Rx produce index reg (RO) */
#define MAC_RXCONSUMEINDEX  (*(volatile unsigned long *)(MAC_BASE_ADDR + 0x118)) /* Rx consume index reg */