linux-kernel - Re: [PATCH V2 linux-next] net: fix rcu access on phonet

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Message-Id: <20141006.181651.2058519626308257571.davem@davemloft.net>
Date:	Mon, 06 Oct 2014 18:16:51 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	fabf@...net.be
Cc:	linux-kernel@...r.kernel.org, edumazet@...gle.com,
	josh@...htriplett.org, courmisch@...il.com, netdev@...r.kernel.org
Subject: Re: [PATCH V2 linux-next] net: fix rcu access on phonet_routes

From: Fabian Frederick <fabf@...net.be>
Date: Mon,  6 Oct 2014 20:15:20 +0200

> -Add __rcu annotation on table to fix sparse warnings:
> net/phonet/pn_dev.c:279:25: warning: incorrect type in assignment (different address spaces)
> net/phonet/pn_dev.c:279:25:    expected struct net_device *<noident>
> net/phonet/pn_dev.c:279:25:    got void [noderef] <asn:4>*<noident>
> net/phonet/pn_dev.c:376:17: warning: incorrect type in assignment (different address spaces)
> net/phonet/pn_dev.c:376:17:    expected struct net_device *volatile <noident>
> net/phonet/pn_dev.c:376:17:    got struct net_device [noderef] <asn:4>*<noident>
> net/phonet/pn_dev.c:392:17: warning: incorrect type in assignment (different address spaces)
> net/phonet/pn_dev.c:392:17:    expected struct net_device *<noident>
> net/phonet/pn_dev.c:392:17:    got void [noderef] <asn:4>*<noident>
> 
> -Access table with rcu_access_pointer (fixes the following sparse errors):
> net/phonet/pn_dev.c:278:25: error: incompatible types in comparison expression (different address spaces)
> net/phonet/pn_dev.c:391:17: error: incompatible types in comparison expression (different address spaces)
> 
> Suggested-by: Eric Dumazet <edumazet@...gle.com>
> Signed-off-by: Fabian Frederick <fabf@...net.be>
> ---
> V2: use rcu_access_pointer instead of rcu_dereference out of rcu_read_lock context
>     (suggested by Eric Dumazet).

Applied, thank you.
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