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). 

ARGUMENTS

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 5.5/SPARC  —  Last change: 13 Sep 1992