multiple interface test case

Roman Kagan rkagan at
Tue Apr 12 10:02:17 EDT 2005

On Tue, Apr 12, 2005 at 01:39:40PM +0200, Duncan Sands wrote:
> > I would be surprized if the problem is triggered only if you grab a
> > _bunch_, and AFAICT there are quite a few drivers which grab at least
> > one via usb_driver_claim_interface and then release it via
> > usb_driver_release_interface, and thus should hit it too (unless there's
> > something like an off-by-one error which is triggered only when you grab
> > _all_ interfaces).
> I just tried rmmod usbnet for a two interface device and it hung.  That
> could be for a different reason - there were some messages from the
> networking subsystem about its reference counts.  That could be either
> a reason for or a consequence of the rmmod hang.

I've dug a 3-interface webcam out of the depths of garbage in my office,
and already managed to get rmmod testusb hang on it :)  so I may be able
to be a bit more useful now...


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