What is wrong with this code snippet that tries to detect a button press on GPIO pin 22?

What is wrong with this code snippet that tries to detect a button press on GPIO pin 22?

import RPi.GPIO as GPIO

GPIO.setmode(GPIO.BCM)
GPIO.setup(22, GPIO.IN)

def on_press(channel):
    print("Button pressed")

GPIO.add_event_detect(22, GPIO.RISING, callback=on_press)

while True:
    pass

GPIO.cleanup()