What's the right way to wait for an USB transfer to complete ?

[Sebastien B]

> Havn't looked at your code yet, but the panic is by accessing a
> memory location near address 0, so it's very likely that you are
> accesing a structure member from a NULL pointer.

I've just fixed it.
It was not that simple, there was in fact a problem with a recursed mutex used 
with cv_wait().
Regards,
Sebastien