Commit 43a49cbd authored by Jens Axboe's avatar Jens Axboe

libata: fix NCQ devices behind port multipliers

For devices behind sata port multipliers, we have to make sure that
they share a tag map since all tags for that PMP must be unique.
Signed-off-by: default avatarJens Axboe <>
parent 3070f69b
......@@ -1107,6 +1107,15 @@ static int ata_scsi_dev_config(struct scsi_device *sdev,
depth = min(sdev->host->can_queue, ata_id_queue_depth(dev->id));
depth = min(ATA_MAX_QUEUE - 1, depth);
* If this device is behind a port multiplier, we have
* to share the tag map between all devices on that PMP.
* Set up the shared tag map here and we get automatic.
if (dev->link->ap->pmp_link)
scsi_init_shared_tag_map(sdev->host, ATA_MAX_QUEUE - 1);
scsi_set_tag_type(sdev, MSG_SIMPLE_TAG);
scsi_activate_tcq(sdev, depth);
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