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Commit 49fdf678 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge branch 'for-linus' of git://git.kernel.dk/linux-2.6-block 

* 'for-linus' of git://git.kernel.dk/linux-2.6-block:
  libata: fix NCQ devices behind port multipliers
  scsi: make sure that scsi_init_shared_tag_map() doesn't overwrite existing map
parents b70a6b27 43a49cbd

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);

	}

include/scsi/scsi_tcq.h

+12 −2
Original line number Diff line number Diff line
@@ -140,8 +140,18 @@ static inline struct scsi_cmnd *scsi_find_tag(struct scsi_device *sdev, int tag) 
 */

static inline int scsi_init_shared_tag_map(struct Scsi_Host *shost, int depth)

{

	/*

	 * If the shared tag map isn't already initialized, do it now.

	 * This saves callers from having to check ->bqt when setting up

	 * devices on the shared host (for libata)

	 */

	if (!shost->bqt) {

		shost->bqt = blk_init_tags(depth);

	return shost->bqt ? 0 : -ENOMEM;

		if (!shost->bqt)

			return -ENOMEM;

	}



	return 0;

}



/**