Turn off NCQ if queue depth is adjusted to 1.
---
drivers/ata/libata-scsi.c | 12 +++++++++++-
include/linux/libata.h | 1 +
2 files changed, 12 insertions(+), 1 deletions(-)
diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index 3986ec8..bea9f7a 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -889,6 +889,7 @@ int ata_scsi_change_queue_depth(struct s
{
struct ata_port *ap = ata_shost_to_port(sdev->host);
struct ata_device *dev;
+ unsigned long flags;
int max_depth;
if (queue_depth < 1)
@@ -904,6 +905,14 @@ int ata_scsi_change_queue_depth(struct s
queue_depth = max_depth;
scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, queue_depth);
+
+ spin_lock_irqsave(ap->lock, flags);
+ if (queue_depth > 1)
+ dev->flags &= ~ATA_DFLAG_NCQ_OFF;
+ else
+ dev->flags |= ATA_DFLAG_NCQ_OFF;
+ spin_unlock_irqrestore(ap->lock, flags);
+
return queue_depth;
}
@@ -1293,7 +1302,8 @@ static unsigned int ata_scsi_rw_xlat(str
*/
goto nothing_to_do;
- if ((dev->flags & (ATA_DFLAG_PIO | ATA_DFLAG_NCQ)) == ATA_DFLAG_NCQ) {
+ if ((dev->flags & (ATA_DFLAG_PIO | ATA_DFLAG_NCQ_OFF |
+ ATA_DFLAG_NCQ)) == ATA_DFLAG_NCQ) {
/* yay, NCQ */
if (!lba_48_ok(block, n_block))
goto out_of_range;
diff --git a/include/linux/libata.h b/include/linux/libata.h
index e54a5fd..d1af1db 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -143,6 +143,7 @@ enum {
ATA_DFLAG_CFG_MASK = (1 << 8) - 1,
ATA_DFLAG_PIO = (1 << 8), /* device limited to PIO mode */
+ ATA_DFLAG_NCQ_OFF = (1 << 9), /* devied limited to non-NCQ mode */
ATA_DFLAG_SUSPENDED = (1 << 10), /* device suspended */
ATA_DFLAG_INIT_MASK = (1 << 16) - 1,
--
1.4.2.1
-
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