From 95f59bf88bb75281cc626e283ecefdd5d5641427 Mon Sep 17 00:00:00 2001 From: Madhuparna Bhowmik Date: Thu, 14 May 2020 19:41:15 +0530 Subject: [PATCH] drivers: net: hamradio: Fix suspicious RCU usage warning in bpqether.c This patch fixes the following warning: ============================= WARNING: suspicious RCU usage 5.7.0-rc5-next-20200514-syzkaller #0 Not tainted ----------------------------- drivers/net/hamradio/bpqether.c:149 RCU-list traversed in non-reader section!! Since rtnl lock is held, pass this cond in list_for_each_entry_rcu(). Reported-by: syzbot+bb82cafc737c002d11ca@syzkaller.appspotmail.com Signed-off-by: Madhuparna Bhowmik Signed-off-by: David S. Miller --- drivers/net/hamradio/bpqether.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/net/hamradio/bpqether.c b/drivers/net/hamradio/bpqether.c index fbea6f232819..e2ad3c2e8df5 100644 --- a/drivers/net/hamradio/bpqether.c +++ b/drivers/net/hamradio/bpqether.c @@ -127,7 +127,8 @@ static inline struct net_device *bpq_get_ax25_dev(struct net_device *dev) { struct bpqdev *bpq; - list_for_each_entry_rcu(bpq, &bpq_devices, bpq_list) { + list_for_each_entry_rcu(bpq, &bpq_devices, bpq_list, + lockdep_rtnl_is_held()) { if (bpq->ethdev == dev) return bpq->axdev; }