ata_std_qc_defer (9) Linux Manual Page
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.
Author
Jeff Garzik
- Author.