AFAIK, you have to do lsmod and find out which other modules depend on sbp2 and remove them first. I think you do this by doing lsmod as su and then looking to see which sbp2 is dependent on...
eg on my PC:
parport_pc 32832 1
lp 12200 0
parport 38952 2 parport_pc,lp
I cannot rmmod parport because parport_pc and lp depends on it, so I have to remove lp, then parport_pc, then parport.
Don't ask me how you stop them returning on reboot or when an application wants to use them though! ;-)