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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@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Changli Gao 2010-08-07 20:35:43 -07:00 committed by David S. Miller
parent ba78e2ddca
commit cece1945bf
1 changed files with 2 additions and 0 deletions
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2
net/core/dev.c
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@ -2517,6 +2517,7 @@ int netif_rx(struct sk_buff *skb)
struct rps_dev_flow voidflow, *rflow = &voidflow; struct rps_dev_flow voidflow, *rflow = &voidflow;
int cpu; int cpu;
preempt_disable();
rcu_read_lock(); rcu_read_lock();
cpu = get_rps_cpu(skb->dev, skb, &rflow); 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); ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
rcu_read_unlock(); rcu_read_unlock();
preempt_enable();
} }
#else #else
{ {