static int artop6210_qc_defer(struct ata_queued_cmd *qc) { struct ata_host *host = qc->ap->host; struct ata_port *alt = host->ports[1 ^ qc->ap->port_no]; int rc; rc = ata_std_qc_defer(qc); if (rc != 0) return rc; if (alt && alt->qc_active) return ATA_DEFER_PORT; return 0; }
/** * sata_pmp_qc_defer_cmd_switch - qc_defer for command switching PMP * @qc: ATA command in question * * A host which has command switching PMP support cannot issue * commands to multiple links simultaneously. * * LOCKING: * spin_lock_irqsave(host lock) * * RETURNS: * ATA_DEFER_* if deferring is needed, 0 otherwise. */ int sata_pmp_qc_defer_cmd_switch(struct ata_queued_cmd *qc) { struct ata_link *link = qc->dev->link; struct ata_port *ap = link->ap; if (ap->excl_link == NULL || ap->excl_link == link) { if (ap->nr_active_links == 0 || ata_link_active(link)) { qc->flags |= ATA_QCFLAG_CLEAR_EXCL; return ata_std_qc_defer(qc); } ap->excl_link = link; } return ATA_DEFER_PORT; }
static int artop6210_qc_defer(struct ata_queued_cmd *qc) { struct ata_host *host = qc->ap->host; struct ata_port *alt = host->ports[1 ^ qc->ap->port_no]; int rc; /* First apply the usual rules */ rc = ata_std_qc_defer(qc); if (rc != 0) return rc; /* Now apply serialization rules. Only allow a command if the other channel state machine is idle */ if (alt && alt->qc_active) return ATA_DEFER_PORT; return 0; }