diff options
| author | Eric Dumazet <edumazet@google.com> | 2023-09-22 03:42:15 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2023-10-01 19:39:18 +0100 |
| commit | ceaa714138a372ac63cc2c5c19ee0882d22827f9 (patch) | |
| tree | 73b347539e9039e35d9ef9566cf38ec5e6cfb214 /net/ipv4/udp.c | |
| parent | c9746e6a19c24b2d9a74d6657daee3b39fdc1bec (diff) | |
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 <edumazet@google.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/udp.c')
| -rw-r--r-- | net/ipv4/udp.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c index c3ff984b6354..731a723dc808 100644 --- a/net/ipv4/udp.c +++ b/net/ipv4/udp.c @@ -750,7 +750,7 @@ int __udp4_lib_err(struct sk_buff *skb, u32 info, struct udp_table *udptable) case ICMP_DEST_UNREACH: if (code == ICMP_FRAG_NEEDED) { /* Path MTU discovery */ ipv4_sk_update_pmtu(skb, sk, info); - if (inet->pmtudisc != IP_PMTUDISC_DONT) { + if (READ_ONCE(inet->pmtudisc) != IP_PMTUDISC_DONT) { err = EMSGSIZE; harderr = 1; break; |