netdev - [PATCH] net: disable preemption before call smp_processor

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Date:	Sat,  7 Aug 2010 17:26:02 +0800
From:	Changli Gao <xiaosuo@...il.com>
To:	"David S. Miller" <davem@...emloft.net>
Cc:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Tom Herbert <therbert@...gle.com>, netdev@...r.kernel.org,
	Changli Gao <xiaosuo@...il.com>
Subject: [PATCH] net: disable preemption before call smp_processor_id()

Although netif_rx() isn't expected to be called in process context with
preemption enabled, it'd better handle this case. And this is why get_cpu()
is used in the non-RPS #ifdef branch. If tree RCU is selected,
rcu_read_lock() won't disable preemption, so preempt_disable() should be
called explictly.

Signed-off-by: Changli Gao <xiaosuo@...il.com>
---
 net/core/dev.c |    2 ++
 1 file changed, 2 insertions(+)
diff --git a/net/core/dev.c b/net/core/dev.c
index 2b50896..1ae6543 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -2517,6 +2517,7 @@ int netif_rx(struct sk_buff *skb)
 		struct rps_dev_flow voidflow, *rflow = &voidflow;
 		int cpu;
 
+		preempt_disable();
 		rcu_read_lock();
 
 		cpu = get_rps_cpu(skb->dev, skb, &rflow);
@@ -2526,6 +2527,7 @@ int netif_rx(struct sk_buff *skb)
 		ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
 
 		rcu_read_unlock();
+		preempt_enable();
 	}
 #else
 	{
--
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