diff --git a/net/ipv4/ipmr.c b/net/ipv4/ipmr.c
index f78c4e53dc8c161e334781970bbff6069c084ebb..cd3eda4c09297961bd3263c17943c854bb60b3b6 100644
--- a/net/ipv4/ipmr.c
+++ b/net/ipv4/ipmr.c
@@ -2299,7 +2299,7 @@ int ip_mr_output(struct net *net, struct sock *sk, struct sk_buff *skb)
        struct mr_table *mrt;
        int vif;
 
-       WARN_ON_ONCE(!rcu_read_lock_held());
+       guard(rcu)();
        dev = rt->dst.dev;
 
        if (IPCB(skb)->flags & IPSKB_FORWARDED)
@@ -2313,7 +2313,6 @@ int ip_mr_output(struct net *net, struct sock *sk, struct sk_buff *skb)
        if (IS_ERR(mrt))
                goto mc_output;
 
-       /* already under rcu_read_lock() */
        cache = ipmr_cache_find(mrt, ip_hdr(skb)->saddr, ip_hdr(skb)->daddr);
        if (!cache) {
                vif = ipmr_find_vif(mrt, dev);