LOR in if_detach

[Matthew N. Dodd]

On Thu, 10 Apr 2003, Harti Brandt wrote:
> What would that lock do? I mean, which, if any, of the exported driver
> functions would be called with that lock held?

If we're sure that nobody will be caching our function pointers we can
call another helper function before if_detach() that sets the function
pointers to 'invalid' functions (that is, ones that return an error).

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