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

[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

include/net/sock.h

+4 −1
Original line number Diff line number Diff line
@@ -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;

}

net/bluetooth/af_bluetooth.c

+2 −3
Original line number Diff line number Diff line
@@ -287,11 +287,10 @@ 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);

		if (err)

			break;

	}

	}

	set_current_state(TASK_RUNNING);

	remove_wait_queue(sk->sk_sleep, &wait);

	return err;

net/bluetooth/l2cap.c

+3 −2
Original line number Diff line number Diff line
@@ -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;

net/bluetooth/sco.c

+3 −2
Original line number Diff line number Diff line
@@ -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;

net/core/stream.c

+7 −3
Original line number Diff line number Diff line
@@ -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--;

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