scsi: provide a generic change_queue_type method

Most drivers use exactly the same implementation, so provide it as a
library function.

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

1 files changed, 1 insertions, 16 deletions

diff --git a/drivers/target/loopback/tcm_loop.c b/drivers/target/loopback/tcm_loop.c
index ab3ab27d49b7..3b9c76835b45 100644
--- a/drivers/target/loopback/tcm_loop.c
+++ b/drivers/target/loopback/tcm_loop.c
@@ -135,21 +135,6 @@ static int tcm_loop_change_queue_depth(
         return sdev->queue_depth;
 }
 
-static int tcm_loop_change_queue_type(struct scsi_device *sdev, int tag)
-{
-        if (sdev->tagged_supported) {
-                scsi_set_tag_type(sdev, tag);
-
-                if (tag)
-                        scsi_activate_tcq(sdev, sdev->queue_depth);
-                else
-                        scsi_deactivate_tcq(sdev, sdev->queue_depth);
-        } else
-                tag = 0;
-
-        return tag;
-}
-
 /*
  * Locate the SAM Task Attr from struct scsi_cmnd *
  */
@@ -451,7 +436,7 @@ static struct scsi_host_template tcm_loop_driver_template = {
         .name                   = "TCM_Loopback",
         .queuecommand           = tcm_loop_queuecommand,
         .change_queue_depth     = tcm_loop_change_queue_depth,
-        .change_queue_type      = tcm_loop_change_queue_type,
+        .change_queue_type      = scsi_change_queue_type,
         .eh_abort_handler = tcm_loop_abort_task,
         .eh_device_reset_handler = tcm_loop_device_reset,
         .eh_target_reset_handler = tcm_loop_target_reset,