linux-kernel - Re: [KJ] [PATCH] Correct misc_register return code handling in several drivers

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Date:	Tue, 24 Oct 2006 11:07:00 -0400
From:	Neil Horman <nhorman@...driver.com>
To:	Matthew Wilcox <matthew@....cx>
Cc:	Benjamin Herrenschmidt <benh@...nel.crashing.org>, akpm@...l.org,
	kernel-janitors@...ts.osdl.org, maxk@...lcomm.com,
	kjhall@...ibm.com, linux-kernel@...r.kernel.org
Subject: Re: [KJ] [PATCH] Correct misc_register return code handling in several drivers

On Tue, Oct 24, 2006 at 07:24:37AM -0600, Matthew Wilcox wrote:
> On Tue, Oct 24, 2006 at 08:53:06AM -0400, Neil Horman wrote:
> > The INIT_LIST_HEAD is there to prevent a potential oops on module removal.
> > misc_register, if it fails, leaves miscdevice.list unchanged.  That means its
> > next and prev pointers contain NULL or garbage, when both pointers should contain
> > &miscdevice.list. If we don't do that, then there is a chance we will oops on
> > module removal when we do a list_del in misc_deregister on the moudule_exit
> > routine.  I could have done this statically, but I thought it looked cleaner to
> > do it with the macro in the code.
> 
> Maybe it would be better to have misc_register() call INIT_LIST_HEAD in
> the failure case?

Hmm, that seems reasonable.  If you don't mind, since there are other unrelated
clean-ups in this patch, I'll make that change in a follow on patch.  But I
think thats a good idea.

Thanks & Regards
Neil

-- 
/***************************************************
 *Neil Horman
 *Software Engineer
 *gpg keyid: 1024D / 0x92A74FA1 - http://pgp.mit.edu
 ***************************************************/
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