linux-kernel - Re: [Patch -mm 0/3] RFC: module unloading vs. release function

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Message-Id: <1176778517.14322.276.camel@localhost.localdomain>
Date:	Tue, 17 Apr 2007 12:55:17 +1000
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Alexey Dobriyan <adobriyan@...il.com>
Cc:	Alan Stern <stern@...land.harvard.edu>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Cornelia Huck <cornelia.huck@...ibm.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Greg K-H <greg@...ah.com>, Tejun Heo <htejun@...il.com>
Subject: Re: [Patch -mm 0/3] RFC: module unloading vs. release function

On Tue, 2007-04-17 at 00:44 +0400, Alexey Dobriyan wrote:
> On Mon, Apr 16, 2007 at 03:38:52PM -0400, Alan Stern wrote:
> >      3. Change the module code so that rmmod can return _before_ the
> > 	module is actually unloaded from memory (but after the module's
> > 	exit routine has completed).  This will lead to more problems.
> > 	For example, what if someone tries to modprobe my_module back
> > 	again before it has finished unloading?
> 
> This problem (or its absence) must be already in tree: module_mutex is
> dropped for the duration of ->exit() function, so init_module(2) could
> load new old module meanwhile.

Only if you give it a different name when loading it the second time.

Rusty.

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