> > For example a webcam driver would want to claim a webcam's interfaces on
> > device connection, but it shouldn't reserve ep bandwidth until a user
> > application is ready to use the device. Then, it should reserve the
> > bandwidth for the endpoints it will use.
>
> Likewise, open() doesn't mean that an application is going to be
> driving the endpoints. The only thing with those semantics is
> a call to write() or read().
Entirely correct. Now you might want to argue that failing read due to
insufficient bandwidth is wrong. To do that you need a way to allocate
bandwidth without submitting an URB.
In addition this API has the advantage of extreme bluntness.
Regards
Oliver
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