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.