kldunload DIAGNOSTIC idea...

Poul-Henning Kamp phk at phk.freebsd.dk
Wed Jul 21 02:22:14 PDT 2004


In message <200407211010.08159.dfr at nlsystems.com>, Doug Rabson writes:

>The original intention was that drivers use the 
>device_busy()/device_unbusy() counter to handle these things. In some 
>cases, just calling device_busy() from fooopen() and device_unbusy() 
>from fooclose() is sufficient.

That is not enough.  All methods in cdevsw, and things not in cdevsw
(clone handlers, call backs, etc etc) needs to refcount.

I have a lot of this working in a tree here, and will commit it once
I have gone over it a few more times.

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.


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