Commit c1cbe4b7 authored by Benjamin LaHaise's avatar Benjamin LaHaise Committed by David S. Miller

[NET]: Avoid atomic xchg() for non-error case

It also looks like there were 2 places where the test on sk_err was
missing from the event wait logic (in sk_stream_wait_connect and
sk_stream_wait_memory), while the rest of the sock_error() users look
to be doing the right thing.  This version of the patch fixes those,
and cleans up a few places that were testing ->sk_err directly.
Signed-off-by: default avatarBenjamin LaHaise <benjamin.c.lahaise@intel.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent f1f71e03
......@@ -1166,7 +1166,10 @@ static inline int sock_queue_err_skb(struct sock *sk, struct sk_buff *skb)
static inline int sock_error(struct sock *sk)
{
int err = xchg(&sk->sk_err, 0);
int err;
if (likely(!sk->sk_err))
return 0;
err = xchg(&sk->sk_err, 0);
return -err;
}
......
......@@ -287,10 +287,9 @@ int bt_sock_wait_state(struct sock *sk, int state, unsigned long timeo)
timeo = schedule_timeout(timeo);
lock_sock(sk);
if (sk->sk_err) {
err = sock_error(sk);
err = sock_error(sk);
if (err)
break;
}
}
set_current_state(TASK_RUNNING);
remove_wait_queue(sk->sk_sleep, &wait);
......
......@@ -767,8 +767,9 @@ static int l2cap_sock_sendmsg(struct kiocb *iocb, struct socket *sock, struct ms
BT_DBG("sock %p, sk %p", sock, sk);
if (sk->sk_err)
return sock_error(sk);
err = sock_error(sk);
if (err)
return err;
if (msg->msg_flags & MSG_OOB)
return -EOPNOTSUPP;
......
......@@ -637,8 +637,9 @@ static int sco_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
BT_DBG("sock %p, sk %p", sock, sk);
if (sk->sk_err)
return sock_error(sk);
err = sock_error(sk);
if (err)
return err;
if (msg->msg_flags & MSG_OOB)
return -EOPNOTSUPP;
......
......@@ -55,8 +55,9 @@ int sk_stream_wait_connect(struct sock *sk, long *timeo_p)
int done;
do {
if (sk->sk_err)
return sock_error(sk);
int err = sock_error(sk);
if (err)
return err;
if ((1 << sk->sk_state) & ~(TCPF_SYN_SENT | TCPF_SYN_RECV))
return -EPIPE;
if (!*timeo_p)
......@@ -67,6 +68,7 @@ int sk_stream_wait_connect(struct sock *sk, long *timeo_p)
prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
sk->sk_write_pending++;
done = sk_wait_event(sk, timeo_p,
!sk->sk_err &&
!((1 << sk->sk_state) &
~(TCPF_ESTABLISHED | TCPF_CLOSE_WAIT)));
finish_wait(sk->sk_sleep, &wait);
......@@ -137,7 +139,9 @@ int sk_stream_wait_memory(struct sock *sk, long *timeo_p)
set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
sk->sk_write_pending++;
sk_wait_event(sk, &current_timeo, sk_stream_memory_free(sk) &&
sk_wait_event(sk, &current_timeo, !sk->sk_err &&
!(sk->sk_shutdown & SEND_SHUTDOWN) &&
sk_stream_memory_free(sk) &&
vm_wait);
sk->sk_write_pending--;
......
......@@ -1438,8 +1438,9 @@ static int irda_recvmsg_stream(struct kiocb *iocb, struct socket *sock,
/*
* POSIX 1003.1g mandates this order.
*/
if (sk->sk_err)
ret = sock_error(sk);
ret = sock_error(sk);
if (ret)
break;
else if (sk->sk_shutdown & RCV_SHUTDOWN)
;
else if (noblock)
......
......@@ -566,10 +566,9 @@ static int llc_wait_data(struct sock *sk, long timeo)
/*
* POSIX 1003.1g mandates this order.
*/
if (sk->sk_err) {
rc = sock_error(sk);
rc = sock_error(sk);
if (rc)
break;
}
rc = 0;
if (sk->sk_shutdown & RCV_SHUTDOWN)
break;
......
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