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Re: kern/39211: ubsa device does no longer work since January 2008 said:
> But I'm anxious that uhmodem needs ubsa to be at usbifif

If it does, it is incorrect, and needs to be fixed. ubsa
was there earlier, and there is no excuse for breaking it.
I'm not going to break uhmodem intentionally, and we should
try to solicit testers, but the ubsa attachment change is
obviously wrong and it is pure luck that it doesn't lead
to crashes.

So did you test with UBSA_DEFAULT_CONFIG_INDEX set to 0 or 1?

> 1. 12x "ubsa0: ubsa_request: STALLED" when connecting to ucom0.

That would need some more extensive debugging to find out -- might
be misbehaviour of the device or a host adapter driver bug.
(I don't really believe in the latter, but I can't rule it out.)

> detaches and attaches again

That's likely device misbehaviour - it drops out in some way.
This might be worked around by adding some timeouts in the
attach/detach detection code.
But this is dangerous because if someone manages to eg switch
a USB memory stick for another one so that the switch gets
not detected, serious data corruption could happen.
(Of course one should't switch a mounted memory stick, but anyway.)

best regards

Forschungszentrum Juelich GmbH
52425 Juelich

Sitz der Gesellschaft: Juelich
Eingetragen im Handelsregister des Amtsgerichts Dueren Nr. HR B 3498
Vorsitzende des Aufsichtsrats: MinDir'in Baerbel Brumme-Bothe
Geschaeftsfuehrung: Prof. Dr. Achim Bachem (Vorsitzender),
Dr. Ulrich Krafft (stellv. Vorsitzender), Prof. Dr. Harald Bolt,
Dr. Sebastian M. Schmidt

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