codeigniter pagination stack overflow

1$total = $this->bmodel->countResultsBanner();
2    $data['total'] = $total;
3/* Comment out this part
4        $uri_segment = $this->uri->segment(4);
5        if($uri_segment == 0 || empty($uri_segment)){
6        $uri_segment = 0;
7        }
8    */
9    $perPage = 5;
10    $config['base_url'] = base_url()."index.php/modules/banner/index";
11    $config['total_rows'] = $total;
12    $config['per_page'] = $perPage;
13    $config['num_links'] = 4;
14    //$config['cur_tag_open'] = '<b><span class="current_page">';
15    //$config['cur_tag_close'] = '</span></b>'; 
16    $this->pagination->initialize($config); 
17/*Change the following line*/
18 $result = $this->bmodel->getAllBanners($perPage,$this->uri->segment(5));
19    $data['result'] = $result;
20