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)

Return

ATA_DEFER_* if deferring is needed, 0 otherwise.