[PATCH 13/14] netpoll: re-enable irq in poll_napi()
From: Cong Wang <hidden>
Date: 2012-08-10 07:11:27
Subsystem:
networking [general], the rest · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
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 <redacted> --- net/core/netpoll.c | 10 +++++++++- 1 files changed, 9 insertions(+), 1 deletions(-)
diff --git a/net/core/netpoll.c b/net/core/netpoll.c
index e4ba3e7..346b1eb 100644
--- 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(); } }
--
1.7.7.6