devfs_mk_dir not working?

["Tvrtko A. Ursulin" <mr.tvrtko@xxxxxxx>]

Hello everyone!

This is my first posting to this list. I have a module which, in __init, calls 
devfs_mk_dir(usb_devfs_handle,name,NULL);

Under many tested kernels including 2.4.18 it works as expected and directory 
appers under /dev/usb. 

But on one machine directory doesn't appear in /dev/usb although devfs_mk_dir 
doesn't return a NULL pointer. So my module thinks everything is ok and goes 
on with __init. 

What could be causing this strange behaviour?

Best regards and thank you in advance!