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);

ARGUMENTS

handle

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

INTERFACE LEVEL

Solaris DDI specific (Solaris DDI).

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