Krisfar,
Can I suggest you read the Flight Crew Training Manual allied with the QRH checklist. Initial actions for any slat/flap jammed is to pull speed as otherwise flap lever will be controlling speed according to flap lever position. Pulling current speed will give you a safe speed to fly. The Overspeed warning will give a correct warning (it is sensed from actual flap position). Barbers pole will be incorrect as it is based on flap lever position.