[CCID 3]: Simplify control flow of ccid3_hc_tx_send_packet
This makes some logically equivalent simplifications, by replacing
rc - values plus goto's with direct return statements.
Signed-off-by: Gerrit Renker <gerrit@xxxxxxxxxxxxxx>
---
net/dccp/ccids/ccid3.c | 40 ++++++++++++++++++----------------------
1 file changed, 18 insertions(+), 22 deletions(-)
--- a/net/dccp/ccids/ccid3.c
+++ b/net/dccp/ccids/ccid3.c
@@ -247,6 +247,12 @@ out:
sock_put(sk);
}
+/*
+ * returns
+ * > 0: delay (in msecs) that should pass before actually sending
+ * = 0: can send immediately
+ * < 0: error condition; do not send packet
+ */
static int ccid3_hc_tx_send_packet(struct sock *sk,
struct sk_buff *skb, int len)
{
@@ -255,7 +261,6 @@ static int ccid3_hc_tx_send_packet(struc
struct dccp_tx_hist_entry *new_packet;
struct timeval now;
long delay;
- int rc = -ENOTCONN;
BUG_ON(hctx == NULL);
@@ -265,7 +270,7 @@ static int ccid3_hc_tx_send_packet(struc
* packets can have zero length, but why the comment about "pure ACK"?
*/
if (unlikely(len == 0))
- goto out;
+ return -ENOTCONN;
/* See if last packet allocated was not sent */
new_packet = dccp_tx_hist_head(&hctx->ccid3hctx_hist);
@@ -273,11 +278,10 @@ static int ccid3_hc_tx_send_packet(struc
new_packet = dccp_tx_hist_entry_new(ccid3_tx_hist,
SLAB_ATOMIC);
- rc = -ENOBUFS;
if (unlikely(new_packet == NULL)) {
DCCP_WARN("%s, sk=%p, not enough mem to add to history,"
"send refused\n", dccp_role(sk), sk);
- goto out;
+ return -ENOBUFS;
}
dccp_tx_hist_add_entry(&hctx->ccid3hctx_hist, new_packet);
@@ -299,7 +303,6 @@ static int ccid3_hc_tx_send_packet(struc
/* Set t_0 for initial packet */
hctx->ccid3hctx_t_nom = now;
- rc = 0;
break;
case TFRC_SSTATE_NO_FBACK:
case TFRC_SSTATE_FBACK:
@@ -312,28 +315,21 @@ static int ccid3_hc_tx_send_packet(struc
* else
* // send the packet in (t_nom - t_now) milliseconds.
*/
- if (delay < hctx->ccid3hctx_delta)
- rc = 0;
- else
- rc = delay/1000L;
+ if (delay >= hctx->ccid3hctx_delta)
+ return delay/1000L;
break;
case TFRC_SSTATE_TERM:
DCCP_BUG("Illegal %s state TERM, sk=%p", dccp_role(sk), sk);
- rc = -EINVAL;
- break;
+ return -EINVAL;
}
- /* Can we send? if so add options and add to packet history */
- if (rc == 0) {
- dp->dccps_hc_tx_insert_options = 1;
- new_packet->dccphtx_ccval =
- DCCP_SKB_CB(skb)->dccpd_ccval =
- hctx->ccid3hctx_last_win_count;
- timeval_add_usecs(&hctx->ccid3hctx_t_nom,
- hctx->ccid3hctx_t_ipi);
- }
-out:
- return rc;
+ /* prepare to send now (add options etc.) */
+ dp->dccps_hc_tx_insert_options = 1;
+ new_packet->dccphtx_ccval = DCCP_SKB_CB(skb)->dccpd_ccval
+ = hctx->ccid3hctx_last_win_count;
+ timeval_add_usecs(&hctx->ccid3hctx_t_nom, hctx->ccid3hctx_t_ipi);
+
+ return 0;
}
static void ccid3_hc_tx_packet_sent(struct sock *sk, int more, int len)
-
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