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| author | Eric Dumazet <edumazet@google.com> | 2019-10-10 20:17:41 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2019-10-13 10:13:08 -0700 |
| commit | 0f31746452e6793ad6271337438af8f4defb8940 (patch) | |
| tree | b30e39e3839addc642ceb8c87ce5e20be2c79fae /net/ipv4/tcp_diag.c | |
| parent | 7db48e983930285b765743ebd665aecf9850582b (diff) | |
| download | linux-stable-0f31746452e6793ad6271337438af8f4defb8940.tar.gz linux-stable-0f31746452e6793ad6271337438af8f4defb8940.tar.bz2 linux-stable-0f31746452e6793ad6271337438af8f4defb8940.zip | |
tcp: annotate tp->write_seq lockless reads
There are few places where we fetch tp->write_seq while
this field can change from IRQ or other cpu.
We need to add READ_ONCE() annotations, and also make
sure write sides use corresponding WRITE_ONCE() to avoid
store-tearing.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/tcp_diag.c')
| -rw-r--r-- | net/ipv4/tcp_diag.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/net/ipv4/tcp_diag.c b/net/ipv4/tcp_diag.c index 66273c8a55c2..549506162dde 100644 --- a/net/ipv4/tcp_diag.c +++ b/net/ipv4/tcp_diag.c @@ -28,7 +28,7 @@ static void tcp_diag_get_info(struct sock *sk, struct inet_diag_msg *r, r->idiag_rqueue = max_t(int, READ_ONCE(tp->rcv_nxt) - READ_ONCE(tp->copied_seq), 0); - r->idiag_wqueue = tp->write_seq - tp->snd_una; + r->idiag_wqueue = READ_ONCE(tp->write_seq) - tp->snd_una; } if (info) tcp_get_info(sk, info); |