ata: libata-sata: allow re-enabling NCQ with the same queue_depth

When ata_eh_speed_down() disables NCQ due to excessive errors, it sets
ATA_DFLAG_NCQ_OFF without changing sdev->queue_depth. Userspace can
re-enable NCQ by writing a queue depth > 1 to the sysfs queue_depth
attribute, which invokes ata_change_queue_depth() to clear
ATA_DFLAG_NCQ_OFF.

However, ata_change_queue_depth() returns early if the requested
queue_depth is equal to sdev->queue_depth before clearing
ATA_DFLAG_NCQ_OFF. As a result, writing a different queue depth > 1
re-enables NCQ, whereas writing the current sdev->queue_depth value
leaves ATA_DFLAG_NCQ_OFF set.

Since ata_change_queue_depth() already checks whether queue_depth equals
sdev->queue_depth before calling scsi_change_queue_depth(), remove the
early check so that writing the current queue_depth > 1 clears
ATA_DFLAG_NCQ_OFF and re-enables NCQ.

Fixes: 45623d33bfc0 ("ata: libata-sata: Improve ata_change_queue_depth()")
Signed-off-by: Igor Pylypiv <ipylypiv@google.com>
Reviewed-by: Niklas Cassel <cassel@kernel.org>
Link: https://lore.kernel.org/r/20261029184445.1615717-1-ipylypiv@google.com
Signed-off-by: Niklas Cassel <cassel@kernel.org>

0 files changed, 0 insertions, 0 deletions