[CCID2]: Replace read-only variable with constant

This replaces the field member `numdupack', which was used as a read-only
constant in the code, with a #define.

Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Signed-off-by: Ian McDonald <ian.mcdonald@jandi.co.nz>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 5 insertions, 6 deletions

diff --git a/net/dccp/ccids/ccid2.c b/net/dccp/ccids/ccid2.c
index 9fa0eb5f691b..a3c42cd00b00 100644
--- a/net/dccp/ccids/ccid2.c
+++ b/net/dccp/ccids/ccid2.c
@@ -586,8 +586,7 @@ static void ccid2_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
                         hctx->ccid2hctx_rpdupack++;
 
                         /* check if we got enough dupacks */
-                        if (hctx->ccid2hctx_rpdupack >=
-                            hctx->ccid2hctx_numdupack) {
+                        if (hctx->ccid2hctx_rpdupack >= NUMDUPACK) {
                                 hctx->ccid2hctx_rpdupack = -1; /* XXX lame */
                                 hctx->ccid2hctx_rpseq = 0;
 
@@ -708,7 +707,7 @@ static void ccid2_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
         while (1) {
                 if (seqp->ccid2s_acked) {
                         done++;
-                        if (done == hctx->ccid2hctx_numdupack)
+                        if (done == NUMDUPACK)
                                 break;
                 }
                 if (seqp == hctx->ccid2hctx_seqt)
@@ -719,7 +718,7 @@ static void ccid2_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
         /* If there are at least 3 acknowledgements, anything unacknowledged
          * below the last sequence number is considered lost
          */
-        if (done == hctx->ccid2hctx_numdupack) {
+        if (done == NUMDUPACK) {
                 struct ccid2_seq *last_acked = seqp;
 
                 /* check for lost packets */
@@ -761,7 +760,6 @@ static int ccid2_hc_tx_init(struct ccid *ccid, struct sock *sk)
 
         /* RFC 4341, 5: initialise ssthresh to arbitrarily high (max) value */
         hctx->ccid2hctx_ssthresh  = ~0;
-        hctx->ccid2hctx_numdupack = 3;
 
         /*
          * RFC 4341, 5: "The cwnd parameter is initialized to at most four
diff --git a/net/dccp/ccids/ccid2.h b/net/dccp/ccids/ccid2.h
index 6d0b4e32b161..443f08a667a2 100644
--- a/net/dccp/ccids/ccid2.h
+++ b/net/dccp/ccids/ccid2.h
@@ -24,6 +24,8 @@
 #include <linux/timer.h>
 #include <linux/types.h>
 #include "../ccid.h"
+/* NUMDUPACK parameter from RFC 4341, p. 6 */
+#define NUMDUPACK       3
 
 struct sock;
 
@@ -52,7 +54,6 @@ struct ccid2_hc_tx_sock {
         int                     ccid2hctx_acks;
         unsigned int            ccid2hctx_ssthresh;
         int                     ccid2hctx_pipe;
-        int                     ccid2hctx_numdupack;
         struct ccid2_seq        *ccid2hctx_seqbuf[CCID2_SEQBUF_MAX];
         int                     ccid2hctx_seqbufc;
         struct ccid2_seq        *ccid2hctx_seqh;