scsi: don't set tagging state from scsi_adjust_queue_depth

Remove the tagged argument from scsi_adjust_queue_depth, and just let it
handle the queue depth.  For most drivers those two are fairly separate,
given that most modern drivers don't care about the SCSI "tagged" status
of a command at all, and many old drivers allow queuing of multiple
untagged commands in the driver.

Instead we start out with the ->simple_tags flag set before calling
->slave_configure, which is how all drivers actually looking at
->simple_tags except for one worke anyway.  The one other case looks
broken, but I've kept the behavior as-is for now.

Except for that we only change ->simple_tags from the ->change_queue_type,
and when rejecting a tag message in a single driver, so keeping this
churn out of scsi_adjust_queue_depth is a clear win.

Now that the usage of scsi_adjust_queue_depth is more obvious we can
also remove all the trivial instances in ->slave_alloc or ->slave_configure
that just set it to the cmd_per_lun default.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Mike Christie <michaelc@cs.wisc.edu>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>

1 files changed, 6 insertions, 14 deletions

diff --git a/drivers/scsi/libsas/sas_scsi_host.c b/drivers/scsi/libsas/sas_scsi_host.c
index eee21a060d93..56d698af073d 100644
--- a/drivers/scsi/libsas/sas_scsi_host.c
+++ b/drivers/scsi/libsas/sas_scsi_host.c
@@ -940,13 +940,13 @@ int sas_slave_configure(struct scsi_device *scsi_dev)
         sas_read_port_mode_page(scsi_dev);
 
         if (scsi_dev->tagged_supported) {
-                scsi_adjust_queue_depth(scsi_dev, MSG_SIMPLE_TAG, SAS_DEF_QD);
+                scsi_adjust_queue_depth(scsi_dev, SAS_DEF_QD);
         } else {
                 SAS_DPRINTK("device %llx, LUN %llx doesn't support "
                             "TCQ\n", SAS_ADDR(dev->sas_addr),
                             scsi_dev->lun);
                 scsi_dev->tagged_supported = 0;
-                scsi_adjust_queue_depth(scsi_dev, 0, 1);
+                scsi_adjust_queue_depth(scsi_dev, 1);
         }
 
         scsi_dev->allow_restart = 1;
@@ -967,7 +967,7 @@ int sas_change_queue_depth(struct scsi_device *sdev, int depth, int reason)
         case SCSI_QDEPTH_RAMP_UP:
                 if (!sdev->tagged_supported)
                         depth = 1;
-                scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
+                scsi_adjust_queue_depth(sdev, depth);
                 break;
         case SCSI_QDEPTH_QFULL:
                 scsi_track_queue_full(sdev, depth);
@@ -979,19 +979,11 @@ int sas_change_queue_depth(struct scsi_device *sdev, int depth, int reason)
         return depth;
 }
 
-int sas_change_queue_type(struct scsi_device *scsi_dev, int qt)
+int sas_change_queue_type(struct scsi_device *scsi_dev, int type)
 {
-        struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
-
-        if (dev_is_sata(dev))
+        if (dev_is_sata(sdev_to_domain_dev(scsi_dev)))
                 return -EINVAL;
-
-        if (!scsi_dev->tagged_supported)
-                return 0;
-
-        scsi_adjust_queue_depth(scsi_dev, qt, scsi_dev->queue_depth);
-
-        return qt;
+        return scsi_change_queue_type(scsi_dev, type);
 }
 
 int sas_bios_param(struct scsi_device *scsi_dev,