From ceaa714138a372ac63cc2c5c19ee0882d22827f9 Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Fri, 22 Sep 2023 03:42:15 +0000 Subject: inet: implement lockless IP_MTU_DISCOVER inet->pmtudisc can be read locklessly. Implement proper lockless reads and writes to inet->pmtudisc ip_sock_set_mtu_discover() can now be called from arbitrary contexts. Signed-off-by: Eric Dumazet Reviewed-by: David Ahern Signed-off-by: David S. Miller --- net/ipv4/raw.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'net/ipv4/raw.c') diff --git a/net/ipv4/raw.c b/net/ipv4/raw.c index 4b5db5d1edc2..ade1aecd7c71 100644 --- a/net/ipv4/raw.c +++ b/net/ipv4/raw.c @@ -239,7 +239,7 @@ static void raw_err(struct sock *sk, struct sk_buff *skb, u32 info) if (code > NR_ICMP_UNREACH) break; if (code == ICMP_FRAG_NEEDED) { - harderr = inet->pmtudisc != IP_PMTUDISC_DONT; + harderr = READ_ONCE(inet->pmtudisc) != IP_PMTUDISC_DONT; err = EMSGSIZE; } else { err = icmp_err_convert[code].errno; -- cgit v1.2.3