| 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¶
| May 2024 | Kernel Hackers Manual 2.6. |