target: Don't force session reset if queue_depth does not change

Keeping in the idempotent nature of target_core_fabric_configfs.c,
if a queue_depth value is set and it's the same as the existing
value, don't attempt to force session reinstatement.

Reported-by: Raghu Krishnamurthy <rk@datera.io>
Cc: Raghu Krishnamurthy <rk@datera.io>
Tested-by: Gary Guo <ghg@datera.io>
Cc: Gary Guo <ghg@datera.io>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

drivers/target/target_core_tpg.c

@@ -397,6 +397,13 @@ int core_tpg_set_initiator_node_queue_depth(
 {
 	struct se_portal_group *tpg = acl->se_tpg;
 
+	/*
+	 * Allow the setting of se_node_acl queue_depth to be idempotent,
+	 * and not force a session shutdown event if the value is not
+	 * changing.
+	 */
+	if (acl->queue_depth == queue_depth)
+		return 0;
 	/*
 	 * User has requested to change the queue depth for a Initiator Node.
 	 * Change the value in the Node's struct se_node_acl, and call