netdev - Re: [PATCH v2] inetpeer: fix a race in inetpeer_gc

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Message-ID: <20120605130953.GG27795@secunet.com>
Date:	Tue, 5 Jun 2012 15:09:54 +0200
From:	Steffen Klassert <steffen.klassert@...unet.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	David Miller <davem@...emloft.net>, netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH v2] inetpeer: fix a race in inetpeer_gc_worker()

On Tue, Jun 05, 2012 at 03:00:18PM +0200, Eric Dumazet wrote:
> From: Eric Dumazet <edumazet@...gle.com>
> 
> commit 5faa5df1fa2024 (inetpeer: Invalidate the inetpeer tree along with
> the routing cache) added a race :
> 
> Before freeing an inetpeer, we must respect a RCU grace period, and make
> sure no user will attempt to increase refcnt.
> 
> inetpeer_invalidate_tree() waits for a RCU grace period before inserting
> inetpeer tree into gc_list and waking the worker. At that time, no
> concurrent lookup can find a inetpeer in this tree.
> 
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> Cc: Steffen Klassert <steffen.klassert@...unet.com>

Acked-by: Steffen Klassert <steffen.klassert@...unet.com>

Thaks again!

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