linux-kernel - Re: [RFD driver-core] Lifetime problems of the current driver model

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Message-ID: <20070330154042.4c7deb72@gondolin.boeblingen.de.ibm.com>
Date:	Fri, 30 Mar 2007 15:40:42 +0200
From:	Cornelia Huck <cornelia.huck@...ibm.com>
To:	Tejun Heo <htejun@...il.com>
Cc:	gregkh@...e.de, hugh@...itas.com, dmitry.torokhov@...il.com,
	oneukum@...e.de, maneesh@...ibm.com, rpurdie@...ys.net,
	James.Bottomley@...elEye.com, Jeff Garzik <jgarzik@...ox.com>,
	lkml <linux-kernel@...r.kernel.org>,
	"linux-ide@...r.kernel.org" <linux-ide@...r.kernel.org>,
	SCSI Mailing List <linux-scsi@...r.kernel.org>
Subject: Re: [RFD driver-core] Lifetime problems of the current driver model

On Fri, 30 Mar 2007 22:19:52 +0900,
Tejun Heo <htejun@...il.com> wrote:

> > Shouldn't getting/putting the module refcount be solely done in
> > kobject.c? Grab the module reference when the kobject is created and
> > release the module reference in kobject_cleanup() after the release
> > function has been called. This doesn't make kobject_get() heavier, and
> > it ensures we don't delete the module until after the last kobject it is
> > supposed to clean up has been released.
> 
> If we do that, we wouldn't be able to unload a module if there is any
> kobject referencing it even when the node has no openers, so no easy way
> out there.  :-(

But we must not unload the module when there is still a kobject around
referencing a release function in the module, or we will oops if the
kobject is finally released. If needed, the module must clean up its
kobjects in its exit function.
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