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Kernel Functions for Driversddi_dma_free(9F)

NAME

 ddi_dma_free - release system DMA resources

SYNOPSIS

  
#include <sys/ddi.h>
#include <sys/sunddi.h>
int ddi_dma_free(ddi_dma_handle_t handle);

INTERFACE LEVEL

 

Solaris DDI specific (Solaris DDI).

PARAMETERS

 
handle
The handle filled in by a call to ddi_dma_setup(9F).

DESCRIPTION

 

ddi_dma_free() releases system DMA resources set up by ddi_dma_setup(9F). When a DMA transfer completes, the driver should free up system DMA resources established by a call to ddi_dma_setup(9F). This is done by a call to ddi_dma_free(). ddi_dma_free() does an implicit ddi_dma_sync(9F) for you so any further synchronization steps are not necessary.

RETURN VALUES

 

ddi_dma_free() returns:

DDI_SUCCESS
Successfully released resources
DDI_FAILURE
Failed to free resources

CONTEXT

 

ddi_dma_free() can be called from user or interrupt context.

SEE ALSO

 

ddi_dma_addr_setup(9F), ddi_dma_buf_setup(9F), ddi_dma_htoc(9F), ddi_dma_sync(9F), ddi_dma_req(9S)

Writing Device Drivers

SunOS 5.9Go To TopLast Changed 13 Sep 1992
 
      
      
Copyright 2002 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms.