netdev - Re: [PATCH net-next-2.6] ifb: RCU locking avoids touching dev refcount

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Message-ID: <20091102214055.GA2358@ami.dom.local>
Date:	Mon, 2 Nov 2009 22:40:55 +0100
From:	Jarek Poplawski <jarkao2@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Linux Netdev List <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next-2.6] ifb: RCU locking avoids touching dev
 refcount

On Mon, Nov 02, 2009 at 10:34:04PM +0100, Eric Dumazet wrote:
> Jarek Poplawski a écrit :
...
> > So, how is skb->dev protected here, above and below? It seems these
> > rcu read blocks need extending, don't they?
> > 
> 
> Well, this might be true, but we run under tasklet (softirq) with preemption disabled.
> 
> We might move rcu_read_unlock() some lines down to not rely on this.

I think it's needed now at least for readability.

Jarek P.
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