Killing a module

[Victor Tsaran]

Hello, listers!
Does anyone know what steps I should take in order to kill a module from the
memory? One of my module locked the modem up and does not want to be
removed. Whenever I try rmmod with either -a or the -r options, I always get
"device or resource busy". What is the other to kill a monster? of course, I
understand that I can always reboot, but how would I do it without one?
Best and thanks,
Vic