[PATCH] libata: turn off NCQ if queue depth is adjusted to 1
Turn off NCQ if queue depth is adjusted to 1. Signed-off-by: Jeff Garzik <jeff@garzik.org>
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@ -889,6 +889,7 @@ int ata_scsi_change_queue_depth(struct scsi_device *sdev, int queue_depth)
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{
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struct ata_port *ap = ata_shost_to_port(sdev->host);
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struct ata_device *dev;
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unsigned long flags;
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int max_depth;
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if (queue_depth < 1)
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@ -904,6 +905,14 @@ int ata_scsi_change_queue_depth(struct scsi_device *sdev, int queue_depth)
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queue_depth = max_depth;
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scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, queue_depth);
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spin_lock_irqsave(ap->lock, flags);
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if (queue_depth > 1)
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dev->flags &= ~ATA_DFLAG_NCQ_OFF;
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else
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dev->flags |= ATA_DFLAG_NCQ_OFF;
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spin_unlock_irqrestore(ap->lock, flags);
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return queue_depth;
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}
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@ -1293,7 +1302,8 @@ static unsigned int ata_scsi_rw_xlat(struct ata_queued_cmd *qc, const u8 *scsicm
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*/
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goto nothing_to_do;
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if ((dev->flags & (ATA_DFLAG_PIO | ATA_DFLAG_NCQ)) == ATA_DFLAG_NCQ) {
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if ((dev->flags & (ATA_DFLAG_PIO | ATA_DFLAG_NCQ_OFF |
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ATA_DFLAG_NCQ)) == ATA_DFLAG_NCQ) {
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/* yay, NCQ */
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if (!lba_48_ok(block, n_block))
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goto out_of_range;
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@ -143,6 +143,7 @@ enum {
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ATA_DFLAG_CFG_MASK = (1 << 8) - 1,
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ATA_DFLAG_PIO = (1 << 8), /* device limited to PIO mode */
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ATA_DFLAG_NCQ_OFF = (1 << 9), /* devied limited to non-NCQ mode */
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ATA_DFLAG_SUSPENDED = (1 << 10), /* device suspended */
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ATA_DFLAG_INIT_MASK = (1 << 16) - 1,
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