Get nodes of term and it child terms

term_recursive_nodes.php

<?php
/**
 * Uses the passed in term and its children and gets the associated nodes. Pass
 * the returned array into  entity_load to load the nodes.
 *
 * @author  Batandwa Colani
 * @date    2014-02-20
 * @version 1
 *
 * @param   int        $tid The parent term id
 * @return  array           The node ids
 */
function term_recursive_nodes($tid) {
  $query = new EntityFieldQuery();
  $query->entityCondition('entity_type', 'node')
  ->entityCondition('bundle', 'service_provider')
  ->fieldCondition('field_solutions', 'tid', array_merge(array($tid), array_keys(taxonomy_get_children($tid))), 'IN');

  $result = $query->execute();
  if(!empty($result)) {
    $nids = array_keys($result['node']);
    // $nodes = entity_load('node', $nids);
    return $nids;
  }

  return array();
}