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author | Rémi Denis-Courmont <remi.denis-courmont@nokia.com> | 2008-12-17 15:48:31 -0800 |
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committer | David S. Miller <davem@davemloft.net> | 2008-12-17 15:48:31 -0800 |
commit | be677730a0ccb6bedced6f65f2ba8f57a3c607ba (patch) | |
tree | 3885b6ed60b72696a8b0102f7f1b85d0dd27617e /net/phonet | |
parent | 57c81fffc863fb4c1804bc963bcbfb82d736c6df (diff) | |
download | linux-stable-be677730a0ccb6bedced6f65f2ba8f57a3c607ba.tar.gz linux-stable-be677730a0ccb6bedced6f65f2ba8f57a3c607ba.tar.bz2 linux-stable-be677730a0ccb6bedced6f65f2ba8f57a3c607ba.zip |
Phonet: use atomic for packet TX window
GPRS TX flow control won't need to lock the underlying socket anymore.
Signed-off-by: Rémi Denis-Courmont <remi.denis-courmont@nokia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/phonet')
-rw-r--r-- | net/phonet/pep.c | 38 | ||||
-rw-r--r-- | net/phonet/socket.c | 2 |
2 files changed, 22 insertions, 18 deletions
diff --git a/net/phonet/pep.c b/net/phonet/pep.c index bc6d50f83249..bb3e67849b38 100644 --- a/net/phonet/pep.c +++ b/net/phonet/pep.c @@ -225,6 +225,7 @@ static int pipe_rcv_status(struct sock *sk, struct sk_buff *skb) { struct pep_sock *pn = pep_sk(sk); struct pnpipehdr *hdr = pnp_hdr(skb); + int wake = 0; if (!pskb_may_pull(skb, sizeof(*hdr) + 4)) return -EINVAL; @@ -241,16 +242,16 @@ static int pipe_rcv_status(struct sock *sk, struct sk_buff *skb) case PN_LEGACY_FLOW_CONTROL: switch (hdr->data[4]) { case PEP_IND_BUSY: - pn->tx_credits = 0; + atomic_set(&pn->tx_credits, 0); break; case PEP_IND_READY: - pn->tx_credits = 1; + atomic_set(&pn->tx_credits, wake = 1); break; } break; case PN_ONE_CREDIT_FLOW_CONTROL: if (hdr->data[4] == PEP_IND_READY) - pn->tx_credits = 1; + atomic_set(&pn->tx_credits, wake = 1); break; } break; @@ -258,10 +259,7 @@ static int pipe_rcv_status(struct sock *sk, struct sk_buff *skb) case PN_PEP_IND_ID_MCFC_GRANT_CREDITS: if (pn->tx_fc != PN_MULTI_CREDIT_FLOW_CONTROL) break; - if (pn->tx_credits + hdr->data[4] > 0xff) - pn->tx_credits = 0xff; - else - pn->tx_credits += hdr->data[4]; + atomic_add(wake = hdr->data[4], &pn->tx_credits); break; default: @@ -269,7 +267,7 @@ static int pipe_rcv_status(struct sock *sk, struct sk_buff *skb) (unsigned)hdr->data[1]); return -EOPNOTSUPP; } - if (pn->tx_credits) + if (wake) sk->sk_write_space(sk); return 0; } @@ -343,7 +341,7 @@ static int pipe_do_rcv(struct sock *sk, struct sk_buff *skb) } /* fall through */ case PNS_PEP_DISABLE_REQ: - pn->tx_credits = 0; + atomic_set(&pn->tx_credits, 0); pep_reply(sk, skb, PN_PIPE_NO_ERROR, NULL, 0, GFP_ATOMIC); break; @@ -390,7 +388,7 @@ static int pipe_do_rcv(struct sock *sk, struct sk_buff *skb) /* fall through */ case PNS_PIPE_ENABLED_IND: if (!pn_flow_safe(pn->tx_fc)) { - pn->tx_credits = 1; + atomic_set(&pn->tx_credits, 1); sk->sk_write_space(sk); } if (sk->sk_state == TCP_ESTABLISHED) @@ -504,8 +502,9 @@ static int pep_connreq_rcv(struct sock *sk, struct sk_buff *skb) newpn->pn_sk.resource = pn->pn_sk.resource; skb_queue_head_init(&newpn->ctrlreq_queue); newpn->pipe_handle = pipe_handle; + atomic_set(&newpn->tx_credits, 0); newpn->peer_type = peer_type; - newpn->rx_credits = newpn->tx_credits = 0; + newpn->rx_credits = 0; newpn->rx_fc = newpn->tx_fc = PN_LEGACY_FLOW_CONTROL; newpn->init_enable = enabled; @@ -821,14 +820,18 @@ static int pipe_skb_send(struct sock *sk, struct sk_buff *skb) struct pep_sock *pn = pep_sk(sk); struct pnpipehdr *ph; + if (pn_flow_safe(pn->tx_fc) && + !atomic_add_unless(&pn->tx_credits, -1, 0)) { + kfree_skb(skb); + return -ENOBUFS; + } + skb_push(skb, 3); skb_reset_transport_header(skb); ph = pnp_hdr(skb); ph->utid = 0; ph->message_id = PNS_PIPE_DATA; ph->pipe_handle = pn->pipe_handle; - if (pn_flow_safe(pn->tx_fc) && pn->tx_credits) - pn->tx_credits--; return pn_skb_send(sk, skb, &pipe_srv); } @@ -866,7 +869,7 @@ disabled: BUG_ON(sk->sk_state != TCP_ESTABLISHED); /* Wait until flow control allows TX */ - done = pn->tx_credits > 0; + done = atomic_read(&pn->tx_credits); while (!done) { DEFINE_WAIT(wait); @@ -881,7 +884,7 @@ disabled: prepare_to_wait(&sk->sk_socket->wait, &wait, TASK_INTERRUPTIBLE); - done = sk_wait_event(sk, &timeo, pn->tx_credits > 0); + done = sk_wait_event(sk, &timeo, atomic_read(&pn->tx_credits)); finish_wait(&sk->sk_socket->wait, &wait); if (sk->sk_state != TCP_ESTABLISHED) @@ -895,7 +898,8 @@ disabled: goto out; skb_reserve(skb, MAX_PHONET_HEADER + 3); - if (sk->sk_state != TCP_ESTABLISHED || !pn->tx_credits) + if (sk->sk_state != TCP_ESTABLISHED || + !atomic_read(&pn->tx_credits)) goto disabled; /* sock_alloc_send_skb might sleep */ } @@ -917,7 +921,7 @@ int pep_writeable(struct sock *sk) { struct pep_sock *pn = pep_sk(sk); - return (sk->sk_state == TCP_ESTABLISHED) ? pn->tx_credits : 0; + return atomic_read(&pn->tx_credits); } int pep_write(struct sock *sk, struct sk_buff *skb) diff --git a/net/phonet/socket.c b/net/phonet/socket.c index c75aa5cdead5..ada2a35bf7a2 100644 --- a/net/phonet/socket.c +++ b/net/phonet/socket.c @@ -227,7 +227,7 @@ static unsigned int pn_socket_poll(struct file *file, struct socket *sock, if (!mask && sk->sk_state == TCP_CLOSE_WAIT) return POLLHUP; - if (sk->sk_state == TCP_ESTABLISHED && pn->tx_credits) + if (sk->sk_state == TCP_ESTABLISHED && atomic_read(&pn->tx_credits)) mask |= POLLOUT | POLLWRNORM | POLLWRBAND; return mask; |