break;
                if (padapter->driver_stopped || padapter->surprise_removed)
                        break;
-               if (r8712_register_cmd_alive(padapter) != _SUCCESS)
+               if (r8712_register_cmd_alive(padapter))
                        continue;
 _next:
                pcmd = r8712_dequeue_cmd(&pcmdpriv->cmd_queue);
 
  * will raise the cpwm to be greater than or equal to P2.
  * Calling Context: Passive
  * Return Value:
- * _SUCCESS: r8712_cmd_thread can issue cmds to firmware afterwards.
- * _FAIL: r8712_cmd_thread can not do anything.
+ * 0:      r8712_cmd_thread can issue cmds to firmware afterwards.
+ * -EINVAL: r8712_cmd_thread can not do anything.
  */
-sint r8712_register_cmd_alive(struct _adapter *padapter)
+int r8712_register_cmd_alive(struct _adapter *padapter)
 {
-       uint res = _SUCCESS;
+       int res = 0;
        struct pwrctrl_priv *pwrctrl = &padapter->pwrctrlpriv;
 
        mutex_lock(&pwrctrl->mutex_lock);
        register_task_alive(pwrctrl, CMD_ALIVE);
        if (pwrctrl->cpwm < PS_STATE_S2) {
                r8712_set_rpwm(padapter, PS_STATE_S3);
-               res = _FAIL;
+               res = -EINVAL;
        }
        mutex_unlock(&pwrctrl->mutex_lock);
        return res;
 
 };
 
 void r8712_init_pwrctrl_priv(struct _adapter *adapter);
-sint r8712_register_cmd_alive(struct _adapter *padapter);
+int r8712_register_cmd_alive(struct _adapter *padapter);
 void r8712_unregister_cmd_alive(struct _adapter *padapter);
 void r8712_cpwm_int_hdl(struct _adapter *padapter,
                        struct reportpwrstate_parm *preportpwrstate);