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tcp: annotate a data-race around sysctl_tcp_wmem[0]

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When reading wmem[0], it could be changed concurrently without
READ_ONCE() protection. So add one annotation here.

Signed-off-by: Jason Xing <kernelxing@tencent.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jason Xing
2024-03-08 19:25:04 +08:00
committed by David S. Miller
parent 9eb430d40e
commit 683a67da95
1 changed files with 1 additions and 1 deletions
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2
net/ipv4/tcp.c
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@@ -975,7 +975,7 @@ int tcp_wmem_schedule(struct sock *sk, int copy)
* Use whatever is left in sk->sk_forward_alloc and tcp_wmem[0]
* to guarantee some progress.
*/
left = sock_net(sk)->ipv4.sysctl_tcp_wmem[0] - sk->sk_wmem_queued;
left = READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_wmem[0]) - sk->sk_wmem_queued;
if (left > 0)
sk_forced_mem_schedule(sk, min(left, copy));
return min(copy, sk->sk_forward_alloc);