[RXRPC]: Decrease number of pointer derefs in connection.c

Decrease the number of pointer derefs in net/rxrpc/connection.c

Benefits of the patch:
 - Fewer pointer dereferences should make the code slightly faster.
 - Size of generated code is smaller
 - improved readability

Signed-off-by: Jesper Juhl <jesper.juhl@gmail.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 8 insertions, 6 deletions

diff --git a/net/rxrpc/connection.c b/net/rxrpc/connection.c
index 2ba14a75dbb..0e0a4553499 100644
--- a/net/rxrpc/connection.c
+++ b/net/rxrpc/connection.c
@@ -220,6 +220,7 @@ int rxrpc_connection_lookup(struct rxrpc_peer *peer,
 {
         struct rxrpc_connection *conn, *candidate = NULL;
         struct list_head *_p;
+        struct sk_buff *pkt = msg->pkt;
         int ret, fresh = 0;
         __be32 x_epoch, x_connid;
         __be16 x_port, x_servid;
@@ -229,10 +230,10 @@ int rxrpc_connection_lookup(struct rxrpc_peer *peer,
         _enter("%p{{%hu}},%u,%hu",
                peer,
                peer->trans->port,
-               ntohs(msg->pkt->h.uh->source),
+               ntohs(pkt->h.uh->source),
                ntohs(msg->hdr.serviceId));
 
-        x_port          = msg->pkt->h.uh->source;
+        x_port          = pkt->h.uh->source;
         x_epoch         = msg->hdr.epoch;
         x_clflag        = msg->hdr.flags & RXRPC_CLIENT_INITIATED;
         x_connid        = htonl(ntohl(msg->hdr.cid) & RXRPC_CIDMASK);
@@ -267,7 +268,7 @@ int rxrpc_connection_lookup(struct rxrpc_peer *peer,
                 /* fill in the specifics */
                 candidate->addr.sin_family      = AF_INET;
                 candidate->addr.sin_port        = x_port;
-                candidate->addr.sin_addr.s_addr = msg->pkt->nh.iph->saddr;
+                candidate->addr.sin_addr.s_addr = pkt->nh.iph->saddr;
                 candidate->in_epoch             = x_epoch;
                 candidate->out_epoch            = x_epoch;
                 candidate->in_clientflag        = RXRPC_CLIENT_INITIATED;
@@ -675,6 +676,7 @@ int rxrpc_conn_receive_call_packet(struct rxrpc_connection *conn,
                                    struct rxrpc_message *msg)
 {
         struct rxrpc_message *pmsg;
+        struct dst_entry *dst;
         struct list_head *_p;
         unsigned cix, seq;
         int ret = 0;
@@ -710,10 +712,10 @@ int rxrpc_conn_receive_call_packet(struct rxrpc_connection *conn,
 
         call->pkt_rcv_count++;
 
-        if (msg->pkt->dst && msg->pkt->dst->dev)
+        dst = msg->pkt->dst;
+        if (dst && dst->dev)
                 conn->peer->if_mtu =
-                        msg->pkt->dst->dev->mtu -
-                        msg->pkt->dst->dev->hard_header_len;
+                        dst->dev->mtu - dst->dev->hard_header_len;
 
         /* queue on the call in seq order */
         rxrpc_get_message(msg);