linux-kernel - Re: [PATCH v2 3/3] thermal: Make THERMAL

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Message-ID: <20110426213953.6cc227de@endymion.delvare>
Date:	Tue, 26 Apr 2011 21:39:53 +0200
From:	Jean Delvare <khali@...ux-fr.org>
To:	guenter.roeck@...csson.com
Cc:	Len Brown <len.brown@...el.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Rene Herman <rene.herman@...il.com>
Subject: Re: [PATCH v2 3/3] thermal: Make THERMAL_HWMON implementation 
 fully internal

Hi Guenter,

On Tue, 26 Apr 2011 10:43:32 -0700, Guenter Roeck wrote:
> On Tue, 2011-04-26 at 12:29 -0400, Jean Delvare wrote:
> > On Tue, 26 Apr 2011 08:52:12 -0700, Guenter Roeck wrote:
> > > On Tue, Apr 26, 2011 at 11:04:07AM -0400, Jean Delvare wrote:
> > > > * Removal code path is untested, as I have never been able to unload
> > > > the thermal_sys module on any of my systems. Something is pinning it
> > > > and I have no idea what it is.
> > > > 
> > > Doesn't lsmod show the culprit ?
> > 
> > No, it's not a module dependency. The reference counter is set to 1,

Sorry I realize I have been inaccurate. thermal_sys indeed depends on
the processor module, and that's what prevents me from unloading it.
It's the processor module which has a reference count of 1, and no
dependency, so I have no idea how I could unload it.

> > so somewhere in the kernel something is taking a reference to the
> > module and won't release it. I wish this was better instrumented so
> > that it would be possible to know who is doing that.
> 
> The most likely culprit seems to be acpi.

I'm not sure. I don't see any relevant call to try_module_get under
drivers/acpi, and I'm not aware of any other way to increase the
reference count.

-- 
Jean Delvare
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