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| author | Changli Gao <xiaosuo@gmail.com> | 2010-08-07 20:35:43 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2010-08-07 20:35:43 -0700 |
| commit | cece1945bffcf1a823cdfa36669beae118419351 (patch) | |
| tree | a3bd2c2a1953624b710524f56d98d7b1496f60a6 | |
| parent | ba78e2ddca844598c0efcbf2c76d73519a61b902 (diff) | |
| download | blackbird-op-linux-cece1945bffcf1a823cdfa36669beae118419351.tar.gz blackbird-op-linux-cece1945bffcf1a823cdfa36669beae118419351.zip | |
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>
| -rw-r--r-- | net/core/dev.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/net/core/dev.c b/net/core/dev.c index 2b508966146b..1ae654391442 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 { |
