[SCSI] megaraid_sas: Add .change_queue_depth support

Signed-off-by: Adam Radford <aradford@gmail.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

1 files changed, 16 insertions, 0 deletions

diff --git a/drivers/scsi/megaraid/megaraid_sas_base.c b/drivers/scsi/megaraid/megaraid_sas_base.c
index 2d8cdce7b2f5..c71922040539 100644
--- a/drivers/scsi/megaraid/megaraid_sas_base.c
+++ b/drivers/scsi/megaraid/megaraid_sas_base.c
@@ -54,6 +54,7 @@
 #include <scsi/scsi_cmnd.h>
 #include <scsi/scsi_device.h>
 #include <scsi/scsi_host.h>
+#include <scsi/scsi_tcq.h>
 #include "megaraid_sas_fusion.h"
 #include "megaraid_sas.h"
 
@@ -2057,6 +2058,20 @@ megasas_service_aen(struct megasas_instance *instance, struct megasas_cmd *cmd)
         }
 }
 
+static int megasas_change_queue_depth(struct scsi_device *sdev,
+                                      int queue_depth, int reason)
+{
+        if (reason != SCSI_QDEPTH_DEFAULT)
+                return -EOPNOTSUPP;
+
+        if (queue_depth > sdev->host->can_queue)
+                queue_depth = sdev->host->can_queue;
+        scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev),
+                                queue_depth);
+
+        return queue_depth;
+}
+
 /*
  * Scsi host template for megaraid_sas driver
  */
@@ -2074,6 +2089,7 @@ static struct scsi_host_template megasas_template = {
         .eh_timed_out = megasas_reset_timer,
         .bios_param = megasas_bios_param,
         .use_clustering = ENABLE_CLUSTERING,
+        .change_queue_depth = megasas_change_queue_depth,
 };
 
 /**