PFLUSH_DMA_BUFFER callback function (wdm.h)

The callback routine flushes any data remaining in the memory region described by an MDL.

Syntax

PFLUSH_DMA_BUFFER PflushDmaBuffer;

NTSTATUS PflushDmaBuffer(
  [in] PDMA_ADAPTER DmaAdapter,
  [in] PMDL Mdl,
  [in] BOOLEAN ReadOperation
)
{...}

Parameters

[in] DmaAdapter

A pointer to a DMA_ADAPTER structure. This structure is the adapter object that represents the driver's bus-master DMA device or system DMA channel. The caller obtained this pointer from a previous call to the IoGetDmaAdapter routine.

[in] Mdl

A pointer to the MDL that describes the buffer previously passed in the driver's call to MapTransfer.

[in] ReadOperation

Specifies TRUE if the flush is being performed for a read operation, and FALSE for a write operation. For more information, see the following Remarks section.

Return value

Returns STATUS_SUCCESS if the call is successful. Otherwise, returns an appropriate NTSTATUS values error code. For more information, see NTSTATUS Values.

Requirements

See also

Flushing Cached Data during DMA Operations