ATA_STD_QC_DEFER(9) libata Library ATA_STD_QC_DEFER(9)

NAME ata_std_qc_defer - Check whether a qc needs to be deferred

SYNOPSIS int ata_std_qc_defer(struct ata_queued_cmd * qc);

ARGUMENTS qc ATA command in question

DESCRIPTION Non-NCQ commands cannot run with any other command, NCQ or not. As upper layer only knows the queue depth, we are responsible for maintaining exclusion. This function checks whether a new command qc can be issued.

LOCKING spin_lock_irqsave(host lock)

RETURNS ATA_DEFER_* if deferring is needed, 0 otherwise.

AUTHOR Jeff Garzik Author.

COPYRIGHT Kernel Hackers Manual 2.6. September 2014 ATA_STD_QC_DEFER(9)