- int ata_std_qc_defer(struct ata_queued_cmd * qc);
- ATA command in question
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.
ATA_DEFER_* if deferring is needed, 0 otherwise.