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authorJens Axboe <jens.axboe@oracle.com>2008-10-27 19:23:06 +0100
committerJens Axboe <jens.axboe@oracle.com>2008-10-27 19:25:30 +0100
commit43a49cbdf31e812c0d8f553d433b09b421f5d52c (patch)
treebe1e56a51d9a35c1414f26a8d30badc4c4256662 /drivers/ata/libata-scsi.c
parent3070f69b66b7ab2f02d8a2500edae07039c38508 (diff)
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: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'drivers/ata/libata-scsi.c')
-rw-r--r--drivers/ata/libata-scsi.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index 4b95c4387e9e..bbb30d882f05 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -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);
}