[CCID2]: Simplify interface

This patch simplifies the interface of ccid2_hc_tx_alloc_seq():

   * ccid2_hc_tx_alloc_seq() is always called with an argument of
     CCID2_SEQBUF_LEN;

   * other code - ccid2_hc_tx_check_sanity() - even depends on the
     assumption that ccid2_hc_tx_alloc_seq() has been called with this
     particular size;

   * passing the `gfp_t' argument to ccid2_hc_tx_alloc_seq() is
     redundant with gfp_any().

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

1 files changed, 9 insertions, 10 deletions

diff --git a/net/dccp/ccids/ccid2.c b/net/dccp/ccids/ccid2.c
index c199f34c1940..5c6b4f97a664 100644
--- a/net/dccp/ccids/ccid2.c
+++ b/net/dccp/ccids/ccid2.c
@@ -83,8 +83,7 @@ static void ccid2_hc_tx_check_sanity(const struct ccid2_hc_tx_sock *hctx)
 #define ccid2_hc_tx_check_sanity(hctx)
 #endif
 
-static int ccid2_hc_tx_alloc_seq(struct ccid2_hc_tx_sock *hctx, int num,
-                                 gfp_t gfp)
+static int ccid2_hc_tx_alloc_seq(struct ccid2_hc_tx_sock *hctx)
 {
         struct ccid2_seq *seqp;
         int i;
@@ -95,16 +94,16 @@ static int ccid2_hc_tx_alloc_seq(struct ccid2_hc_tx_sock *hctx, int num,
                 return -ENOMEM;
 
         /* allocate buffer and initialize linked list */
-        seqp = kmalloc(sizeof(*seqp) * num, gfp);
+        seqp = kmalloc(CCID2_SEQBUF_LEN * sizeof(struct ccid2_seq), gfp_any());
         if (seqp == NULL)
                 return -ENOMEM;
 
-        for (i = 0; i < (num - 1); i++) {
+        for (i = 0; i < (CCID2_SEQBUF_LEN - 1); i++) {
                 seqp[i].ccid2s_next = &seqp[i + 1];
                 seqp[i + 1].ccid2s_prev = &seqp[i];
         }
-        seqp[num - 1].ccid2s_next = seqp;
-        seqp->ccid2s_prev = &seqp[num - 1];
+        seqp[CCID2_SEQBUF_LEN - 1].ccid2s_next = seqp;
+        seqp->ccid2s_prev = &seqp[CCID2_SEQBUF_LEN - 1];
 
         /* This is the first allocation.  Initiate the head and tail.  */
         if (hctx->ccid2hctx_seqbufc == 0)
@@ -114,8 +113,8 @@ static int ccid2_hc_tx_alloc_seq(struct ccid2_hc_tx_sock *hctx, int num,
                 hctx->ccid2hctx_seqh->ccid2s_next = seqp;
                 seqp->ccid2s_prev = hctx->ccid2hctx_seqh;
 
-                hctx->ccid2hctx_seqt->ccid2s_prev = &seqp[num - 1];
-                seqp[num - 1].ccid2s_next = hctx->ccid2hctx_seqt;
+                hctx->ccid2hctx_seqt->ccid2s_prev = &seqp[CCID2_SEQBUF_LEN - 1];
+                seqp[CCID2_SEQBUF_LEN - 1].ccid2s_next = hctx->ccid2hctx_seqt;
         }
 
         /* store the original pointer to the buffer so we can free it */
@@ -298,7 +297,7 @@ static void ccid2_hc_tx_packet_sent(struct sock *sk, int more, unsigned int len)
                 int rc;
 
                 ccid2_pr_debug("allocating more space in history\n");
-                rc = ccid2_hc_tx_alloc_seq(hctx, CCID2_SEQBUF_LEN, gfp_any());
+                rc = ccid2_hc_tx_alloc_seq(hctx);
                 BUG_ON(rc); /* XXX what do we do? */
 
                 next = hctx->ccid2hctx_seqh->ccid2s_next;
@@ -771,7 +770,7 @@ static int ccid2_hc_tx_init(struct ccid *ccid, struct sock *sk)
         hctx->ccid2hctx_seqbufc   = 0;
 
         /* XXX init ~ to window size... */
-        if (ccid2_hc_tx_alloc_seq(hctx, CCID2_SEQBUF_LEN, GFP_ATOMIC) != 0)
+        if (ccid2_hc_tx_alloc_seq(hctx))
                 return -ENOMEM;
 
         hctx->ccid2hctx_sent     = 0;