From f9fc28a8de2fb367f1ab76f0cf176ca545db3d6f Mon Sep 17 00:00:00 2001 From: Amol Grover Date: Thu, 12 Mar 2020 11:04:20 +0530 Subject: [PATCH] net: caif: Add lockdep expression to RCU traversal primitive caifdevs->list is traversed using list_for_each_entry_rcu() outside an RCU read-side critical section but under the protection of rtnl_mutex. Hence, add the corresponding lockdep expression to silence the following false-positive warning: [ 10.868467] ============================= [ 10.869082] WARNING: suspicious RCU usage [ 10.869817] 5.6.0-rc1-00177-g06ec0a154aae4 #1 Not tainted [ 10.870804] ----------------------------- [ 10.871557] net/caif/caif_dev.c:115 RCU-list traversed in non-reader section!! Reported-by: kernel test robot Signed-off-by: Amol Grover Signed-off-by: David S. Miller --- net/caif/caif_dev.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/net/caif/caif_dev.c b/net/caif/caif_dev.c index 03c7cdd8e4cb..195d2d67be8a 100644 --- a/net/caif/caif_dev.c +++ b/net/caif/caif_dev.c @@ -112,7 +112,8 @@ static struct caif_device_entry *caif_get(struct net_device *dev) caif_device_list(dev_net(dev)); struct caif_device_entry *caifd; - list_for_each_entry_rcu(caifd, &caifdevs->list, list) { + list_for_each_entry_rcu(caifd, &caifdevs->list, list, + lockdep_rtnl_is_held()) { if (caifd->netdev == dev) return caifd; } -- 2.30.2