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dccp: annotate lockless accesses to sk->sk_err_soft 

This field can be read/written without lock synchronization.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2023-03-15 20:57:42 +00:00 committed by David S. Miller
parent cee1af825d
commit 9a25f0cb0d
3 changed files with 14 additions and 11 deletions
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12
net/dccp/ipv4.c
View File

@ -177,7 +177,7 @@ static inline void dccp_do_pmtu_discovery(struct sock *sk,
* for the case, if this connection will not able to recover.
*/
if (mtu < dst_mtu(dst) && ip_dont_fragment(sk, dst))
sk->sk_err_soft = EMSGSIZE;
WRITE_ONCE(sk->sk_err_soft, EMSGSIZE);
mtu = dst_mtu(dst);
@ -339,8 +339,9 @@ static int dccp_v4_err(struct sk_buff *skb, u32 info)
sk_error_report(sk);
dccp_done(sk);
} else
sk->sk_err_soft = err;
} else {
WRITE_ONCE(sk->sk_err_soft, err);
}
goto out;
}
@ -364,8 +365,9 @@ static int dccp_v4_err(struct sk_buff *skb, u32 info)
if (!sock_owned_by_user(sk) && inet->recverr) {
sk->sk_err = err;
sk_error_report(sk);
} else /* Only an error on timeout */
sk->sk_err_soft = err;
} else { /* Only an error on timeout */
WRITE_ONCE(sk->sk_err_soft, err);
}
out:
bh_unlock_sock(sk);
sock_put(sk);

11
net/dccp/ipv6.c
View File

@ -174,17 +174,18 @@ static int dccp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
*/
sk_error_report(sk);
dccp_done(sk);
} else
sk->sk_err_soft = err;
} else {
WRITE_ONCE(sk->sk_err_soft, err);
}
goto out;
}
if (!sock_owned_by_user(sk) && np->recverr) {
sk->sk_err = err;
sk_error_report(sk);
} else
sk->sk_err_soft = err;
} else {
WRITE_ONCE(sk->sk_err_soft, err);
}
out:
bh_unlock_sock(sk);
sock_put(sk);

2
net/dccp/timer.c
View File

@ -19,7 +19,7 @@ int sysctl_dccp_retries2 __read_mostly = TCP_RETR2;
static void dccp_write_err(struct sock *sk)
{
sk->sk_err = sk->sk_err_soft ? : ETIMEDOUT;
sk->sk_err = READ_ONCE(sk->sk_err_soft) ? : ETIMEDOUT;
sk_error_report(sk);
dccp_send_reset(sk, DCCP_RESET_CODE_ABORTED);