Under some circumstances, most obviously the disconnect ioctl, we need to disconnect only one of the interfaces of a device. How are we to do that if we queue by device only?
Are there or are there not both (a) a set of URBs to check, and (b) records of the current configuration and altsetting, so that (c) there's a way to ask if a given urb is associated with a given interface's endpoints?
No, sadly no, EP0 is shared.
SO wait for any ep0 requests to complete, that'll be safe.
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