Message-ID: <42361E33.4020903@ens-lyon.org>
Date: Tue, 15 Mar 2005 00:28:51 +0100
From: Brice Goglin <Brice.Goglin@ens-lyon.org>
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To: Dave Jones <davej@redhat.com>
Cc: Linux Kernel <linux-kernel@vger.kernel.org>
Subject: AGP module removal impossible ?
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Hi Dave,

I can't remove the AGP chipset module on my boxes.
Looks like the AGP chipset driver holds a reference on itself and
thus makes removal impossible.

 From what I understand, as soon as intel_agp is loaded, agp_intel_probe
is called. It gets a reference on intel_agp module through
!try_module_get(bridge->driver->owner) in agp_add_bridge.
Then this reference can only be released through module_put in
agp_remove_bridge which is called agp_intel_remove which is only called
when removing the module.

Thus it looks impossible to remove this module at all.
And I think the problem occurs with all other AGP chipset drivers.

I hope the reason is not just that module removal support is not important
in 2.6 :) It looks strange to implement a module removal routine if we
know it can't be used :)

Regards,
Brice Goglin
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