The proper fix is to change releaseintf() -- and maybe some other routines
in the usbdevfs code as well -- to use ifnum_to_if() for mapping interface numbers to interfaces. It also won't hurt to add considerably more locking code (dev->serialize).
Actually if you look around, you'll notice usbcore uses about four different locks (including dev->serialize) to protect critical sections against changes to device binding ... but the only lock that's _correct_ to use is usb_bus_type.subsys.rwsem though!
(Though there's at least one place that also needs to use dev->serialize to also protect against _config changes_ too.)
But yes, ifnum_to_if() is needed in devio.c in several places.
- Dave
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