RE: What protects cleanup_module() from open()?

Bret Indrelee (bindrelee@sbs-cp.com)
Tue, 30 Nov 1999 13:19:05 -0600

Alan Cox [mailto:alan@lxorguk.ukuu.org.uk] wrote:
> kuznet@ms2.inr.ac.ru wrote:
> > It will not help. After MOD_DEC_USE_COUNT dropped use count to zero,
> > module can be unloaded while pc on one cpu is still inside it.
> >
> > The answer is: modules cannot be unloaded on an SMP system at all,
> > if you do not want to crash.
>
> I pointed this out to Linus and Dave about 6 months ago as
> with 2.2 its fairly
> ok (kernel lock) with 2.3.x its a problem. There are ways to
> fix it for 2.4,
> and since any user can trigger the event in 2.3.x it _has_ to
> be fixed before
> 2.4.0

How is it OK on 2.2? That was the source I was looking at, I couldn't see
anything that held the kernel lock during the open.

It was most likely fine in 2.0, where everything was under one big kernel
lock. I just didn't see where 2.2 was protected.

-Bret

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