You're right. Normal drivers should never have to worry about the config changing out from under them. But they might want to block disconnect() or notify_reset() at certain times. Oliver seems to think that's better done using a private semaphore rather than serialize. What do you think?
As a rule, using fewer locks is better.
I'm not sure I agree that drivers should be able to block those calls. But if there's a real need, it'd clearly be rare; and I suspect that using dev->serialize would suffice.
- Dave
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