Re: RE2: [OKS] Module removal

Werner Almesberger (wa@almesberger.net)
Tue, 2 Jul 2002 01:11:56 -0300

Keith Owens wrote:
> Incrementing the use count at registration time is no good, it stops
> the module being unloaded. Operations are deregistered at rmmod time.
> Setting the use count at registration prevents rmmod from removing the
> module, so you cannot deregister the operations. Catch 22.

But those references go through the module exit function, which
acts like an implicit reference counter. So as long as

- module exit de-registers all of them (if it doesn't, we're
screwed anyhow), and
- the registry itself isn't racy (if it is, this is likely to
surface in other circumstances too, e.g. if a driver destroys
internal state immediately after de-registration)

they should be safe, shouldn't they ?

- Werner

P.S. mail.ocs.com.au thinks I'm a spammer :-(

-- 
  _________________________________________________________________________
 / Werner Almesberger, Buenos Aires, Argentina         wa@almesberger.net /
/_http://icapeople.epfl.ch/almesber/_____________________________________/
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