pci9054得dma重启。

各位大哥：
    我用ddk写9054得dma驱动，在irp_mn_start_device里调用
iogetdmaadarpter时，机子就会重启，说遇到了无法解决得内核错误。cuozainali?
  RtlZeroMemory( &dd, sizeof(dd) );

dd.Version = DEVICE_DESCRIPTION_VERSION;
dd.Master = TRUE; // this is a MASTER device
dd.ScatterGather = FALSE;
dd.DemandMode =TRUE;
dd.AutoInitialize = FALSE;
dd.Dma32BitAddresses = TRUE;

dd.InterfaceType = PCIBus;
dd.MaximumLength = MAX_DMA_LENGTH;
dd.DmaWidth = Width32Bits;
dd.DmaSpeed = Compatible;

// Compute the maximum number of mapping regs
// this device could possibly need.  Since the
// transfer may not be paged aligned, add one
// to allow the max xfer size to span a page.
pDevExt->mapRegisterCount =
(MAX_DMA_LENGTH / PAGE_SIZE) + 1;

pDevExt->pDmaAdapter =
IoGetDmaAdapter( pDevObj,

   & dd,    &pDevExt->mapRegisterCount);

你为什么还要调用IoGetDmaAdapter()呢?
PCI做DMA传输时,一般是有自己的DMA主控器的.

那你是怎么做的呢?