[alsa-devel] How to unload a sound module.

Hi,

I am new to alsa driver development. The first problem I encountered is I could not unload a module just inserted. I always get the following message (using snd-dummy as an example).

sudo rmmod snd-dummy

ERROR: Module snd_dummy is in use

I checked who is using snd-dummy. Here is what I got and I do not know what applications are using it.

Module Size Used by snd_dummy 9600 2

Is there any easy way to unload the sound module?

Thanks, Yiliang