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

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 <jens.axboe@oracle.com>
parent 3070f69b

drivers/ata/libata-scsi.c

+9 −0
Original line number Diff line number Diff line
@@ -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);

	}