From: Madhuparna Bhowmik <madhuparnabhowmik10@gmail.com>
Date: Wed, 19 Feb 2020 20:47:46 +0530
Subject: bridge: br_stp: Use built-in RCU list checking
Patch-mainline: v5.6-rc3
Git-commit: 33c4acbe2f4e8f2866914b1fb90ce74fc7216c21
References: bsc#1176447

list_for_each_entry_rcu() has built-in RCU and lock checking.

Pass cond argument to list_for_each_entry_rcu() to silence
false lockdep warning when CONFIG_PROVE_RCU_LIST is enabled
by default.

Signed-off-by: Madhuparna Bhowmik <madhuparnabhowmik10@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 net/bridge/br_stp.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/net/bridge/br_stp.c
+++ b/net/bridge/br_stp.c
@@ -63,7 +63,8 @@ struct net_bridge_port *br_get_port(stru
 {
 	struct net_bridge_port *p;
 
-	list_for_each_entry_rcu(p, &br->port_list, list) {
+	list_for_each_entry_rcu(p, &br->port_list, list,
+				lockdep_is_held(&br->lock)) {
 		if (p->port_no == port_no)
 			return p;
 	}