netdev - Re: [PATCH] drop_monitor: convert to modular building

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Date:	Wed, 16 May 2012 16:34:56 +0100
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Neil Horman <nhorman@...driver.com>
CC:	<netdev@...r.kernel.org>, "David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH] drop_monitor: convert to modular building

On Wed, 2012-05-16 at 11:19 -0400, Neil Horman wrote:
> On Wed, May 16, 2012 at 04:01:45PM +0100, Ben Hutchings wrote:
> > On Wed, 2012-05-16 at 10:27 -0400, Neil Horman wrote:
> > > When I first wrote drop monitor I wrote it to just build monolithically.  There
> > > is no reason it can't be built modularly as well, so lets give it that
> > > flexibiity.
[...]
> > > +	/*
> > > +	 * Because of the module_get/put we do in the trace state change path
> > > +	 * we are guarnateed not to have any current users when we get here
> > > +	 * all we need to do is make sure that we don't have any running timers
> > > +	 * or pending schedule calls
> > > +	 */
> > 
> > Surely you need to call set_all_monitor_traces(TRACE_OFF) first...
> > 
> Nope, If you'll note the code higher up in the patch, I use try_module_get and
> module_put to prevent the module unload code from getting here while anyone is
> actually using the protocol.  Once we are in the module remove routine here, we
> are guaranateed that there are no users of this protocol, and that the
> tracepoints are all unregistered.
[...]

Yes, of course.

Ben.

-- 
Ben Hutchings, Staff Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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