netdev - Re: [PATCH net] ematch: Fix auto-loading of ematch modules.

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Date:	Mon, 16 Feb 2015 19:50:11 +0100
From:	Ignacy Gawędzki 
	<ignacy.gawedzki@...en-communications.fr>
To:	Cong Wang <cwang@...pensource.com>
Cc:	netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH net] ematch: Fix auto-loading of ematch modules.

On Mon, Feb 16, 2015 at 10:36:06AM -0800, thus spake Cong Wang:
> On Mon, Feb 16, 2015 at 10:13 AM, Ignacy Gawędzki
> <ignacy.gawedzki@...en-communications.fr> wrote:
> > In tcf_em_validate(), when calling tcf_em_lookup(), don't put the resulting
> > pointer directly into em->ops, if the function is to possibly return -EAGAIN
> > after module auto-loading.  Otherwise, module_put() will be called by
> > tcf_em_tree_destroy() on em->ops->owner, while it has already been called by
> > tcf_em_validate() before return.
> >
> 
> Or simply reset em->ops to NULL after module_put()?

Yeah, why not.  I just got my inspiration from what's done in cls_api.c and
act_api.c.  What do you think, should the same simplification be applied to
cls_api.c?

-- 
Ignacy Gawędzki
R&D Engineer
Green Communications
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