netdev - Re: rhashtable: Fix reader/rehash race

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Message-Id: <20150312.230142.925554248034420272.davem@davemloft.net>
Date:	Thu, 12 Mar 2015 23:01:42 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	herbert@...dor.apana.org.au
Cc:	tgraf@...g.ch, netdev@...r.kernel.org
Subject: Re: rhashtable: Fix reader/rehash race

From: Herbert Xu <herbert@...dor.apana.org.au>
Date: Thu, 12 Mar 2015 22:07:49 +1100

> There is a potential race condition between readers and the rehasher.
> In particular, the rehasher could have started a rehash while the
> reader finishes a scan of the old table but fails to see the new
> table pointer.
> 
> This patch closes this window by adding smp_wmb/smp_rmb.
>     
> Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>

Applied.
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