David:
This revised patch implements the approach you described. usb_set_interface() is changed to work even with devices that have only one altsetting, and it gets called after unbinding a driver. There are several other small changes, including a spot in usb_set_configuration() where all the interfaces are marked as being in altsetting 0 -- an obvious fact that was unaccountably missing. Take a look and see what you think.
Reads clean. Though I might document the changed calling context requirement for usb_release_interface(), and it might be good to add an alternate path in usb_disable_endpoint() for "old-style" HCDs, which at least clears maxpacket.
This is another good step towards making the driver lifecycle be properly robust -- thanks!
- Dave
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