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.