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scsi: never drop to untagged mode during queue ramp down

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Dropping to untagged mode when ramping down a queue due to QUEUE FULL
events has two problems:

 - nothing in the midlayer or drivers ever moves back to tagged mode
   during queue ramp up.
 - cmd_per_lun isn't the untagged queue depth for many modern drivers
   that can handle multiple untagged commands, and this is the only
   place in the midlayer assuming that.

Signed-off-by: Christoph Hellwig <[email protected]>
Reviewed-by: Bart Van Assche <[email protected]>
Reviewed-by: Martin K. Petersen <[email protected]
Reviewed-by: Hannes Reinecke <[email protected]>
This commit is contained in:
Christoph Hellwig 2014-11-24 15:36:19 +01:00
commit b70870c38e
1 changed files with 0 additions and 6 deletions
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6
drivers/scsi/scsi.c
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@ -820,12 +820,6 @@ int scsi_track_queue_full(struct scsi_device *sdev, int depth)
if (sdev->last_queue_full_count <= 10)
return 0;
if (sdev->last_queue_full_depth < 8) {
/* Drop back to untagged */
scsi_set_tag_type(sdev, 0);
scsi_change_queue_depth(sdev, sdev->host->cmd_per_lun);
return -1;
}
return scsi_change_queue_depth(sdev, depth);
}