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tcp: annotate data-races around tp->tcp_tx_delay

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[ Upstream commit 348b81b68b13ebd489a3e6a46aa1c384c731c919 ]

do_tcp_getsockopt() reads tp->tcp_tx_delay while another cpu
might change its value.

Fixes: a842fe1425 ("tcp: add optional per socket transmit delay")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Link: https://lore.kernel.org/r/20230719212857.3943972-2-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Eric Dumazet 2023-07-19 21:28:47 +00:00 committed by Greg Kroah-Hartman
parent 30e5460d69
commit 1d4f2c4be1
1 changed files with 2 additions and 2 deletions
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4
net/ipv4/tcp.c
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@ -3447,7 +3447,7 @@ static int do_tcp_setsockopt(struct sock *sk, int level, int optname,
case TCP_TX_DELAY:
if (val)
tcp_enable_tx_delay();
tp->tcp_tx_delay = val;
WRITE_ONCE(tp->tcp_tx_delay, val);
break;
default:
err = -ENOPROTOOPT;
@ -3902,7 +3902,7 @@ static int do_tcp_getsockopt(struct sock *sk, int level,
break;
case TCP_TX_DELAY:
val = tp->tcp_tx_delay;
val = READ_ONCE(tp->tcp_tx_delay);
break;
case TCP_TIMESTAMP: