netpoll: re-enable irq in poll_napi()

napi->poll() needs IRQ enabled, so we have to re-enable IRQ before
calling it.

Cc: David Miller <davem@davemloft.net>
Signed-off-by: Cong Wang <amwang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/core/netpoll.c b/net/core/netpoll.c
index e4ba3e7..346b1eb 100644 (file)
--- a/net/core/netpoll.c
+++ b/net/core/netpoll.c
@@ -168,16 +168,24 @@ static void poll_napi(struct net_device *dev)
        struct napi_struct *napi;
        int budget = 16;
 
+       WARN_ON_ONCE(!irqs_disabled());
+
        list_for_each_entry(napi, &dev->napi_list, dev_list) {
+               local_irq_enable();
                if (napi->poll_owner != smp_processor_id() &&
                    spin_trylock(&napi->poll_lock)) {
+                       rcu_read_lock_bh();
                        budget = poll_one_napi(rcu_dereference_bh(dev->npinfo),
                                               napi, budget);
+                       rcu_read_unlock_bh();
                        spin_unlock(&napi->poll_lock);
 
-                       if (!budget)
+                       if (!budget) {
+                               local_irq_disable();
                                break;
+                       }
                }
+               local_irq_disable();
        }
 }