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Date: Wed, 9 Sep 2020 10:37:53 -0700 From: Jakub Kicinski <kuba@...nel.org> To: davem@...emloft.net Cc: netdev@...r.kernel.org, eric.dumazet@...il.com, kernel-team@...com, Jakub Kicinski <kuba@...nel.org> Subject: [PATCH net-next 3/3] net: make sure napi_list is safe for RCU traversal netpoll needs to traverse dev->napi_list under RCU, make sure it uses the right iterator and that removal from this list is handled safely. Signed-off-by: Jakub Kicinski <kuba@...nel.org> --- net/core/dev.c | 2 +- net/core/netpoll.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/net/core/dev.c b/net/core/dev.c index e0a1be986824..03624192862a 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -6656,7 +6656,7 @@ void __netif_napi_del(struct napi_struct *napi) return; napi_hash_del(napi); - list_del_init(&napi->dev_list); + list_del_rcu(&napi->dev_list); napi_free_frags(napi); flush_gro_hash(napi); diff --git a/net/core/netpoll.c b/net/core/netpoll.c index 2338753e936b..c310c7c1cef7 100644 --- a/net/core/netpoll.c +++ b/net/core/netpoll.c @@ -297,7 +297,7 @@ static int netpoll_owner_active(struct net_device *dev) { struct napi_struct *napi; - list_for_each_entry(napi, &dev->napi_list, dev_list) { + list_for_each_entry_rcu(napi, &dev->napi_list, dev_list) { if (napi->poll_owner == smp_processor_id()) return 1; } -- 2.26.2
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