centos man page for atapi_check_dma

ATAPI_CHECK_DMA(9)					       libata Core Internals						ATAPI_CHECK_DMA(9)

NAME
       atapi_check_dma - Check whether ATAPI DMA can be supported

SYNOPSIS
       int atapi_check_dma(struct ata_queued_cmd * qc);

ARGUMENTS
       qc
	   Metadata associated with taskfile to check

DESCRIPTION
       Allow low-level driver to filter ATA PACKET commands, returning a status indicating whether or not it is OK to use DMA for the supplied
       PACKET command.

LOCKING
       spin_lock_irqsave(host lock)

RETURNS
       0 when ATAPI DMA can be used nonzero otherwise

AUTHOR
       Jeff Garzik
	   Author.

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014							ATAPI_CHECK_DMA(9)