From: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Date: Sat, 23 Aug 2008 11:28:27 +0000 (+0200)
Subject: dccp ccid-3: Replace lazy BUG_ON with condition
X-Git-Tag: v2.6.28-rc1~717^2~390
X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=eff253c4272cd2aac95ccff46d3d2e1a495f22b1;p=linux-2.6-omap-h63xx.git

dccp ccid-3: Replace lazy BUG_ON with condition

The BUG_ON(w_tot == 0) only holds if there is no more than 1 loss interval in
the loss history. If there is only a single loss interval, the calc_i_mean()
routine need in fact not be called (RFC 3448, 6.3.1).

Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
---

diff --git a/net/dccp/ccids/lib/loss_interval.c b/net/dccp/ccids/lib/loss_interval.c
index bcd6ac415bb..5b3ce0688c5 100644
--- a/net/dccp/ccids/lib/loss_interval.c
+++ b/net/dccp/ccids/lib/loss_interval.c
@@ -67,7 +67,10 @@ static void tfrc_lh_calc_i_mean(struct tfrc_loss_hist *lh)
 	u32 i_i, i_tot0 = 0, i_tot1 = 0, w_tot = 0;
 	int i, k = tfrc_lh_length(lh) - 1; /* k is as in rfc3448bis, 5.4 */
 
-	for (i=0; i <= k; i++) {
+	if (k <= 0)
+		return;
+
+	for (i = 0; i <= k; i++) {
 		i_i = tfrc_lh_get_interval(lh, i);
 
 		if (i < k) {
@@ -78,7 +81,6 @@ static void tfrc_lh_calc_i_mean(struct tfrc_loss_hist *lh)
 			i_tot1 += i_i * tfrc_lh_weights[i-1];
 	}
 
-	BUG_ON(w_tot == 0);
 	lh->i_mean = max(i_tot0, i_tot1) / w_tot;
 }