WdfDmaTransactionFreeResources - NtDoc
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// wdfdmatransaction.h
VOID WdfDmaTransactionFreeResources(
[in] WDFDMATRANSACTION DmaTransaction
);
View the official Windows Driver Kit DDI referenceNo description available.
[Applies to KMDF only]
The WdfDmaTransactionFreeResources method releases DMA resources that the driver previously allocated by calling WdfDmaTransactionAllocateResources.
DmaTransaction [in]A handle to the DMA transaction object that the driver provided in a previous call to WdfDmaTransactionAllocateResources.
WdfDmaTransactionFreeResources must be used with a DMA enabler that specifies a packet or system profile.
On operating systems earlier than Windows 8, WdfDmaTransactionFreeResources must be used with an enabler that specifies a single-packet DMA enabler. Starting with Windows 8, WdfDmaTransactionFreeResources can also be used with an enabler that specifies a system-mode DMA enabler.
When called with a scatter/gather DMA enabler, WdfDmaTransactionFreeResources causes a verifier bug check.
The driver's call to WdfDmaTransactionFreeResources may cause the framework to call EvtProgramDma or EvtReserveDma immediately.
For more information about system-mode DMA, see Supporting System-Mode DMA.
WdfDmaTransactionAllocateResources