Login form not validating

Login form not validating

I am creating a login form but it does not do the validation rightly
against the value in the database. when I put in the wrong password it
still redirects me to the page that needs login access
CONTROLLER
public function login() {
$this->form_validation->set_rules('username', 'Username',
'trim|required|alpha_numeric|min_length[6]|max_length[12]|xss_clean');
$this->form_validation->set_rules('password', 'Password',
'trim|required|alpha_numeric|min_length[6]|max_length[6]|xss_clean');
if ($this->form_validation->run() == FALSE) {
// return main page if submitted form is invalid.
$this->load->view('abt_login');
} else {
$this->load->model('abt_db');
$q = $this->abt_db->check_login();
if($q)
{
$data = array(
'email' => $this->input->post('email'),
'password' => $this->input->post('password'),
);
$this->session->set_userdata($data);
redirect('index.php/abovetheblues/abt-abovetheblues');
}
else
{
redirect('index.php/abovetheblues/abt_selfhelp');
}
}
}
MODEL
function check_login() {
$this->load->database();
$this->db->where('email', $this->input->post('email'));
$this->db->where('password', $this->input->post('password'));
$q = $this->db->get('user');
if ($q->num_rows == 1) {
return true;
}
}