scsi: avoid ->change_queue_depth indirection for queue full tracking

All drivers use the implementation for ramping the queue up and down, so
instead of overloading the change_queue_depth method call the
implementation diretly if the driver opts into it by setting the
track_queue_depth flag in the host template.

Note that a few drivers validated the new queue depth in their
change_queue_depth method, but as we never go over the queue depth
set during slave_configure or the sysfs file this isn't nessecary
and can safely be removed.

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: Venkatesh Srinivas <venkateshs@google.com>

1 files changed, 3 insertions, 14 deletions

diff --git a/drivers/scsi/libsas/sas_scsi_host.c b/drivers/scsi/libsas/sas_scsi_host.c
index 89e8b687a679..914e41165137 100644
--- a/drivers/scsi/libsas/sas_scsi_host.c
+++ b/drivers/scsi/libsas/sas_scsi_host.c
@@ -961,20 +961,9 @@ int sas_change_queue_depth(struct scsi_device *sdev, int depth, int reason)
                 return __ata_change_queue_depth(dev->sata_dev.ap, sdev, depth,
                                                 reason);
 
-        switch (reason) {
-        case SCSI_QDEPTH_DEFAULT:
-        case SCSI_QDEPTH_RAMP_UP:
-                if (!sdev->tagged_supported)
-                        depth = 1;
-                scsi_adjust_queue_depth(sdev, depth);
-                break;
-        case SCSI_QDEPTH_QFULL:
-                scsi_track_queue_full(sdev, depth);
-                break;
-        default:
-                return -EOPNOTSUPP;
-        }
-
+        if (!sdev->tagged_supported)
+                depth = 1;
+        scsi_adjust_queue_depth(sdev, depth);
         return depth;
 }