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authorTejun Heo <htejun@gmail.com>2006-09-30 19:45:00 +0900
committerJeff Garzik <jeff@garzik.org>2006-09-30 07:39:24 -0400
commit360f654e7cda850034f3f6252a7a7cff3fa77356 (patch)
tree2279e397c59501cfda60d7d97d4976e42b8f2983 /drivers
parente5c9e081e9c980fa785cd9002c25a251cf3f090e (diff)
[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>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/ata/libata-scsi.c12
1 files changed, 11 insertions, 1 deletions
diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index b4a0246506ef..b0d0cc41f3e8 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -889,6 +889,7 @@ int ata_scsi_change_queue_depth(struct scsi_device *sdev, int queue_depth)
{
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 scsi_device *sdev, int queue_depth)
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(struct ata_queued_cmd *qc, const u8 *scsicm
*/
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;