netdev - Re: [NET] ROUTE: fix rcu_dereference() uses in /proc/net/rt

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Message-ID: <20080111103852.GB26740@gondor.apana.org.au>
Date:	Fri, 11 Jan 2008 21:38:52 +1100
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Jarek Poplawski <jarkao2@...il.com>
Cc:	Eric Dumazet <dada1@...mosbay.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	davem@...emloft.net, dipankar@...ibm.com, netdev@...r.kernel.org
Subject: Re: [NET] ROUTE: fix rcu_dereference() uses in /proc/net/rt_cache

On Fri, Jan 11, 2008 at 10:11:40AM +0100, Jarek Poplawski wrote:
> 
> So, IOW: strictly speaking you are right, r can't change here, but I
> meant r vs. the returned value! Before the patch the returned value
> couldn't be NULL unless all elements of the list were looped. After
> this patch it seems possible...

Since rcu_derference(r) is always the same as r this patch cannot
change the value returned.

Cheers,
-- 
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Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
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