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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

struct ata_queued_cmd * 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)

RETURN

0 when ATAPI DMA can be used nonzero otherwise

AUTHOR

Jeff Garzik
Author.

COPYRIGHT

September 2017 Kernel Hackers Manual 4.12