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NC:wdm.PFREE_COMMON_BUFFER |
PFREE_COMMON_BUFFER (wdm.h) |
The FreeCommonBuffer routine frees a common buffer allocated by AllocateCommonBuffer, along with all resources the buffer uses. |
kernel\freecommonbuffer.htm |
kernel |
04/30/2018 |
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FreeCommonBuffer, FreeCommonBuffer callback function [Kernel-Mode Driver Architecture], PFREE_COMMON_BUFFER, PFREE_COMMON_BUFFER callback, kdma_73f76fbd-2641-4002-90c8-ca412e969418.xml, kernel.freecommonbuffer, wdm/FreeCommonBuffer |
wdm.h |
Wdm.h, Ntddk.h, Ntifs.h |
Desktop |
Available starting with Windows 2000. |
IrqlDispatch |
PASSIVE_LEVEL |
Windows |
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The FreeCommonBuffer routine frees a common buffer allocated by AllocateCommonBuffer, along with all resources the buffer uses.
Pointer to the DMA_ADAPTER structure returned by IoGetDmaAdapter that represents the bus-master adapter or DMA controller.
Specifies the number of bytes to deallocate.
Specifies the logical address of the allocated memory range.
Pointer to the corresponding virtual address of the allocated memory range.
Indicates whether the allocated memory is cached.
FreeCommonBuffer is not a system routine that can be called directly by name. This routine is callable only by pointer from the address returned in a DMA_OPERATIONS structure. Drivers obtain the address of this routine by calling IoGetDmaAdapter.
To release a common buffer, a driver calls FreeCommonBuffer to unmap both its logical and virtual addresses. The parameters passed to FreeCommonBuffer must match exactly those passed to and returned from AllocateCommonBuffer. A driver cannot free part of an allocated common buffer.