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 2.6. May 2011 ATAPI_CHECK_DMA(9)