multiple interface test case

[Duncan Sands]

Hi Roman,

> The appended patch fixes it for me (written for 2.6.12-rc2, applied to
> and run on 2.6.11).  I'm not yet fluent with klists so it'll take longer
> to cook up one for -mm.
> 
> Still I wonder for how long it was there, because every
> usb_driver_release_interface() during rmmod should have revealed that
> problem.

I also suspected the lists, however while this may be part of the truth,
the situation seems more complicated in -mm.  There one reference is not
dropped - but why?  I now have stack dumps of all kobject_put/get calls
for the driver, so it should become clear soon I hope...

Ciao,

D.