Another question on module unloading

[Jarod Wilson]

On Wednesday 20 February 2008 09:25:46 am Matt Domsch wrote:
> On Wed, Feb 20, 2008 at 04:20:33PM +0200, Eugene Goubine wrote:
> >    Where can I get an information about the order in which the modules
> > are unloaded
> >    when the system shuts down.I am writing a module which is going to be
> > sort of networking protocol
> >    so the unloading order is crucial for me.
>
> In general, kernel modules are not unloaded at system shutdown.
>
> If they are unloaded, that's done so by the initscripts of various
> programs.  A quick grep 'modprobe -r' /etc/init.d/*  shows that
> cpuspeed, ip6tables, ip6tables, and lm_sensors initscripts (on my
> system) unload kernel modules.

Nb: in the cpuspeed case, the module unloads aren't on shutdown either. 
They're done when we try loading a cpufreq driver that we think will work on 
the system, but it doesn't find supported hardware. Rather than leaving a 
useless module loaded, we do some clean-up in this case.

-- 
Jarod Wilson
jwilson at redhat.com