// video.h

VIDEOPORT_DEPRECATED VIDEOPORT_API BOOLEAN VideoPortUnlockPages(
  PVOID hwDeviceExtension,
  PDMA  pDma
);
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Windows Driver Kit DDI reference (nf-video-videoportunlockpages)

VideoPortUnlockPages function

Description

The VideoPortUnlockPages function is obsolete in Windows 2000 and later. Use VideoPortUnlockBuffer in place of this function.

VideoPortUnlockPages releases memory used for packet-based DMA.

Parameters

`hwDeviceExtension`

Pointer to the miniport driver's device extension.

`pDma`

Specifies a non-NULL DMA handle.

Return value

VideoPortUnlockPages always returns TRUE.

Remarks

See Bus-Master DMA in Video Miniport Drivers for information about packet-based and common-buffer DMA transfers.

This function can be called only within the context of a DMA IOCTL. It cannot be called from an ISR or DPC.

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