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, 9 insertions, 8 deletions

diff --git a/drivers/scsi/53c700.c b/drivers/scsi/53c700.c
index 497cbb1efd4b..d7557b932113 100644
--- a/drivers/scsi/53c700.c
+++ b/drivers/scsi/53c700.c
@@ -902,8 +902,10 @@ process_message(struct Scsi_Host *host,	struct NCR_700_Host_Parameters *hostdata
                         /* we're done negotiating */
                         NCR_700_set_tag_neg_state(SCp->device, NCR_700_FINISHED_TAG_NEGOTIATION);
                         hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
+
                         SCp->device->tagged_supported = 0;
-                        scsi_adjust_queue_depth(SCp->device, 0, host->cmd_per_lun);
+                        scsi_adjust_queue_depth(SCp->device, host->cmd_per_lun);
+                        scsi_set_tag_type(SCp->device, 0);
                 } else {
                         shost_printk(KERN_WARNING, host,
                                 "(%d:%d) Unexpected REJECT Message %s\n",
@@ -2050,12 +2052,10 @@ NCR_700_slave_configure(struct scsi_device *SDp)
 
         /* to do here: allocate memory; build a queue_full list */
         if(SDp->tagged_supported) {
-                scsi_adjust_queue_depth(SDp, MSG_ORDERED_TAG, NCR_700_DEFAULT_TAGS);
+                scsi_adjust_queue_depth(SDp, NCR_700_DEFAULT_TAGS);
                 NCR_700_set_tag_neg_state(SDp, NCR_700_START_TAG_NEGOTIATION);
-        } else {
-                /* initialise to default depth */
-                scsi_adjust_queue_depth(SDp, 0, SDp->host->cmd_per_lun);
         }
+
         if(hostdata->fast) {
                 /* Find the correct offset and period via domain validation */
                 if (!spi_initial_dv(SDp->sdev_target))
@@ -2083,7 +2083,7 @@ NCR_700_change_queue_depth(struct scsi_device *SDp, int depth, int reason)
         if (depth > NCR_700_MAX_TAGS)
                 depth = NCR_700_MAX_TAGS;
 
-        scsi_adjust_queue_depth(SDp, scsi_get_tag_type(SDp), depth);
+        scsi_adjust_queue_depth(SDp, depth);
         return depth;
 }
 
@@ -2101,15 +2101,16 @@ static int NCR_700_change_queue_type(struct scsi_device *SDp, int tag_type)
         if (change_tag)
                 scsi_target_quiesce(SDp->sdev_target);
 
+        scsi_set_tag_type(SDp, tag_type);
         if (!tag_type) {
                 /* shift back to the default unqueued number of commands
                  * (the user can still raise this) */
-                scsi_adjust_queue_depth(SDp, 0, SDp->host->cmd_per_lun);
+                scsi_adjust_queue_depth(SDp, SDp->host->cmd_per_lun);
                 hostdata->tag_negotiated &= ~(1 << sdev_id(SDp));
         } else {
                 /* Here, we cleared the negotiation flag above, so this
                  * will force the driver to renegotiate */
-                scsi_adjust_queue_depth(SDp, tag_type, SDp->queue_depth);
+                scsi_adjust_queue_depth(SDp, SDp->queue_depth);
                 if (change_tag)
                         NCR_700_set_tag_neg_state(SDp, NCR_700_START_TAG_NEGOTIATION);
         }