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[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>
This commit is contained in:
Tejun Heo 2006-09-30 19:45:00 +09:00 committed by Jeff Garzik
parent e5c9e081e9
commit 360f654e7c
2 changed files with 12 additions and 1 deletions
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12
drivers/ata/libata-scsi.c
View File

@ -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;

1
include/linux/libata.h
View File

@ -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,