Well, it seems that I'm going to have to answer my own self ... :)
Yes, usb-audio seems to be a bit forgotten... (Takashi, those mplayer-plughw-segfaults still persist, even on x86 and even with kernel 2.4 (current cvs of drivers/lib, of course)
hmmm, the submit_urb-error is gone, but random lockups and usb-device-disconnect until reboot have come... (bitkeeper-2.6 from just one hour ago...) with your function.
The following is what I've been able to find using additional tracing info. Also there's a fix for usbaudio.c.
Have fun*
Niklas
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