PS: Here is the patch that fixed the original usbfs Oops, but gained the new one Vince reported:
Good -- more locks vanishing from usbcore; it's about time! This is a case where fewer locks are better.
My main patch feedback here would be that it should merge most of the usbfs patch I sent (second URL below). There's a driver model locking requirement that you didn't know about, it needs to bubble up (subsys.rwsem writelock must be held if you're going to change driver bindings). And there were a few other rough spots, which I think you've mentioned (and I don't think they were new issues).
The more I think about it, the more I like your idea of changing device->serialize to be an rwsem. Changing config, or resetting the device, would get the writelock. All other uses should share, with readlocks -- that's the right model.
Likely not before 2.6.1 though ... ;)
- Dave
[1] http://marc.theaimsgroup.com/?l=linux-usb-devel&m=107100212612153&w=2 [2] http://marc.theaimsgroup.com/?l=linux-usb-devel&m=107102580404037&w=2
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