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 <hch@xxxxxx>
---
drivers/scsi/scsi.c | 6 ------
1 file changed, 6 deletions(-)
diff --git a/drivers/scsi/scsi.c b/drivers/scsi/scsi.c
index 72282ae..6b0d524 100644
--- a/drivers/scsi/scsi.c
+++ b/drivers/scsi/scsi.c
@@ -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);
}
--
1.9.1
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