netdev - Re: [0/8] netpoll/bridge fixes

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Date:	Wed, 16 Jun 2010 13:33:36 +1000
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	David Miller <davem@...emloft.net>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	shemminger@...tta.com, mst@...hat.com, frzhang@...hat.com,
	netdev@...r.kernel.org, amwang@...hat.com, mpm@...enic.com
Subject: Re: [0/8] netpoll/bridge fixes

On Wed, Jun 16, 2010 at 05:03:20AM +0200, Eric Dumazet wrote:
>
> I wonder how these patches were tested, Herbert ?

You know, not everyone enables RCU debugging...

Anyway, this patch should fix the problems you've spotted.

netpoll: Use correct primitives for RCU dereferencing

Now that RCU debugging checks for matching rcu_dereference calls
and rcu_read_lock, we need to use the correct primitives or face
nasty warnings.

Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>

diff --git a/include/linux/netpoll.h b/include/linux/netpoll.h
index 4c77fe7..413742c 100644
--- a/include/linux/netpoll.h
+++ b/include/linux/netpoll.h
@@ -64,7 +64,7 @@ static inline bool netpoll_rx(struct sk_buff *skb)
 	bool ret = false;
 
 	rcu_read_lock_bh();
-	npinfo = rcu_dereference(skb->dev->npinfo);
+	npinfo = rcu_dereference_bh(skb->dev->npinfo);
 
 	if (!npinfo || (list_empty(&npinfo->rx_np) && !npinfo->rx_flags))
 		goto out;
@@ -82,7 +82,7 @@ out:
 
 static inline int netpoll_rx_on(struct sk_buff *skb)
 {
-	struct netpoll_info *npinfo = rcu_dereference(skb->dev->npinfo);
+	struct netpoll_info *npinfo = rcu_dereference_bh(skb->dev->npinfo);
 
 	return npinfo && (!list_empty(&npinfo->rx_np) || npinfo->rx_flags);
 }

Thanks,
-- 
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Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
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