ban udev to load module but enable modprobe to do so

Dear experts,

I need to
ban udev to load module but enable modprobe to load modules uppon user demand

How can I ban loading module named “pcan.ko” via udev

PCAN module is RTDM RTAI driver which works fine when loaded via modprobe during system operation but many times hangs when udev loads another module during pcan loading or loading modules o RTAI on which PCAN depends.

Would anyone help me, please?
I am not fammiliar with udev rules and taht is my problem

I look forward heranig from you

Yours Faithfuly

Peter