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libata: fix NCQ devices behind port multipliers

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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: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Jens Axboe 2008-10-27 19:23:06 +01:00
parent 3070f69b66
commit 43a49cbdf3
1 changed files with 9 additions and 0 deletions
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drivers/ata/libata-scsi.c
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@ -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);
}