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¶

struct ata_queued_cmd * qc

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)

RETURN¶

ATA_DEFER_* if deferring is needed, 0 otherwise.

AUTHOR¶

Jeff Garzik

COPYRIGHT¶