[alsa-devel] how to unload alsa kernel driver

I'm new to kernel development and is trying out the dummy alsa driver. I can compile and install snd_dummy driver on my Ubuntu, but how do I remove it?

It seems that after installation, snd_pcm and snd automatically depends on snd_dummy, so rmmod will not work.

Alsa force-unload snd-dummy also not work. Can somebody help? I don't want to restart my machine every time.

Thanks George