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>
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 @@
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 @@
ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
rcu_read_unlock();
+ preempt_enable();
}
#else
{