netdev - Re: [PATCH] ipv4: arp: fix a lockdep splat in arp

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Message-Id: <20121221.131604.630440467916062914.davem@davemloft.net>
Date:	Fri, 21 Dec 2012 13:16:04 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	erdnetdev@...il.com
Cc:	netdev@...r.kernel.org, yanb@...lanox.com, shemminger@...tta.com
Subject: Re: [PATCH] ipv4: arp: fix a lockdep splat in arp_solicit()

From: Eric Dumazet <erdnetdev@...il.com>
Date: Fri, 21 Dec 2012 09:32:10 -0800

> From: Eric Dumazet <edumazet@...gle.com>
> 
> Yan Burman reported following lockdep warning :
 ...
> Bug is from arp_solicit(), releasing the neigh lock after arp_send()
> In case of vxlan, we eventually need to write lock a neigh lock later.
> 
> Its a false positive, but we can get rid of it without lockdep
> annotations.
> 
> We can instead use neigh_ha_snapshot() helper.
> 
> Reported-by: Yan Burman <yanb@...lanox.com>
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> Acked-by: Stephen Hemminger <shemminger@...tta.com>

Applied.
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