ethtool: reduce stack usage

[safe/jmp/linux-2.6] / net / phonet / pep.c

diff --git a/net/phonet/pep.c b/net/phonet/pep.c
index b6356f3..360cf37 100644 (file)
--- a/net/phonet/pep.c
+++ b/net/phonet/pep.c
@@ -354,6 +354,9 @@ static int pipe_do_rcv(struct sock *sk, struct sk_buff *skb)
                queue = &pn->ctrlreq_queue;
                goto queue;
 
+       case PNS_PIPE_ALIGNED_DATA:
+               __skb_pull(skb, 1);
+               /* fall through */
        case PNS_PIPE_DATA:
                __skb_pull(skb, 3); /* Pipe data header */
                if (!pn_flow_safe(pn->rx_fc)) {
@@ -441,6 +444,7 @@ static int pep_connreq_rcv(struct sock *sk, struct sk_buff *skb)
        struct sockaddr_pn dst;
        u16 peer_type;
        u8 pipe_handle, enabled, n_sb;
+       u8 aligned = 0;
 
        if (!pskb_pull(skb, sizeof(*hdr) + 4))
                return -EINVAL;
@@ -479,6 +483,9 @@ static int pep_connreq_rcv(struct sock *sk, struct sk_buff *skb)
                                return -EINVAL;
                        peer_type = (peer_type & 0xff00) | data[0];
                        break;
+               case PN_PIPE_SB_ALIGNED_DATA:
+                       aligned = data[0] != 0;
+                       break;
                }
                n_sb--;
        }
@@ -510,6 +517,7 @@ static int pep_connreq_rcv(struct sock *sk, struct sk_buff *skb)
        newpn->rx_credits = 0;
        newpn->rx_fc = newpn->tx_fc = PN_LEGACY_FLOW_CONTROL;
        newpn->init_enable = enabled;
+       newpn->aligned = aligned;
 
        BUG_ON(!skb_queue_empty(&newsk->sk_receive_queue));
        skb_queue_head(&newsk->sk_receive_queue, skb);
@@ -829,11 +837,15 @@ static int pipe_skb_send(struct sock *sk, struct sk_buff *skb)
                return -ENOBUFS;
        }
 
-       skb_push(skb, 3);
+       skb_push(skb, 3 + pn->aligned);
        skb_reset_transport_header(skb);
        ph = pnp_hdr(skb);
        ph->utid = 0;
-       ph->message_id = PNS_PIPE_DATA;
+       if (pn->aligned) {
+               ph->message_id = PNS_PIPE_ALIGNED_DATA;
+               ph->data[0] = 0; /* padding */
+       } else
+               ph->message_id = PNS_PIPE_DATA;
        ph->pipe_handle = pn->pipe_handle;
 
        return pn_skb_send(sk, skb, &pipe_srv);
@@ -848,7 +860,9 @@ static int pep_sendmsg(struct kiocb *iocb, struct sock *sk,
        int flags = msg->msg_flags;
        int err, done;
 
-       if (msg->msg_flags & MSG_OOB || !(msg->msg_flags & MSG_EOR))
+       if ((msg->msg_flags & ~(MSG_DONTWAIT|MSG_EOR|MSG_NOSIGNAL|
+                               MSG_CMSG_COMPAT)) ||
+                       !(msg->msg_flags & MSG_EOR))
                return -EOPNOTSUPP;
 
        skb = sock_alloc_send_skb(sk, MAX_PNPIPE_HEADER + len,
@@ -927,6 +941,9 @@ int pep_write(struct sock *sk, struct sk_buff *skb)
        struct sk_buff *rskb, *fs;
        int flen = 0;
 
+       if (pep_sk(sk)->aligned)
+               return pipe_skb_send(sk, skb);
+
        rskb = alloc_skb(MAX_PNPIPE_HEADER, GFP_ATOMIC);
        if (!rskb) {
                kfree_skb(skb);
@@ -966,6 +983,10 @@ static int pep_recvmsg(struct kiocb *iocb, struct sock *sk,
        struct sk_buff *skb;
        int err;
 
+       if (flags & ~(MSG_OOB|MSG_PEEK|MSG_TRUNC|MSG_DONTWAIT|MSG_WAITALL|
+                       MSG_NOSIGNAL|MSG_CMSG_COMPAT))
+               return -EOPNOTSUPP;
+
        if (unlikely(1 << sk->sk_state & (TCPF_LISTEN | TCPF_CLOSE)))
                return -ENOTCONN;
 
@@ -973,6 +994,8 @@ static int pep_recvmsg(struct kiocb *iocb, struct sock *sk,
                /* Dequeue and acknowledge control request */
                struct pep_sock *pn = pep_sk(sk);
 
+               if (flags & MSG_PEEK)
+                       return -EOPNOTSUPP;
                skb = skb_dequeue(&pn->ctrlreq_queue);
                if (skb) {
                        pep_ctrlreq_error(sk, skb, PN_PIPE_NO_ERROR,