[openib-general] Re: RE: Re: [PATCH] ipoib_flush_paths

[Michael S. Tsirkin]

Quoting r. Muli Ben-Yehuda <mulix at mulix.org>:
> Subject: Re: [openib-general] Re: RE: Re: [PATCH] ipoib_flush_paths
> 
> On Thu, Apr 06, 2006 at 04:17:55PM +0300, Michael S. Tsirkin wrote:
> > Quoting r. Roland Dreier <rdreier at cisco.com>:
> > > I'm pretty sure that any scheme that tries to use module reference
> > > counting will either be horribly complex, still have subtle races, or
> > > (mostly likely) both.
> > 
> > Actually, it turned out to be the simplest solution - and quite
> > elegant since there's no room for mistakes: if query is going to be running
> > this means module is still loaded so we can take a reference to it
> > without races.
> 
> Don't you have a race between the point you make the call (pass
> THIS_MODULE) and the point you __get_module on it? what's keeping the
> module from disappearing between those two points?

No, since we are keeping a callback pointer into that module.

-- 
MST