From fa44327c06492c9bd625dbc8dbe35e5d5965fec6 Mon Sep 17 00:00:00 2001
From: Stefano Brivio <stefano.brivio@polimi.it>
Date: Sun, 23 Dec 2007 04:41:19 +0100
Subject: [PATCH] rc80211-pid: simplify and fix shift_adjust
Simplify and fix rate_control_pid_shift_adjust(). A bug prevented correct
mapping of sorted rates, and readability was seriously flawed.
Signed-off-by: Stefano Brivio <stefano.brivio@polimi.it>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
net/mac80211/rc80211_pid_algo.c | 34 ++++++++++++++++-----------------
1 file changed, 16 insertions(+), 18 deletions(-)
diff --git a/net/mac80211/rc80211_pid_algo.c b/net/mac80211/rc80211_pid_algo.c
index b84e51480c844..3e26280d31420 100644
--- a/net/mac80211/rc80211_pid_algo.c
+++ b/net/mac80211/rc80211_pid_algo.c
@@ -74,29 +74,27 @@ static int rate_control_pid_shift_adjust(struct rc_pid_rateinfo *r,
{
int i, j, k, tmp;
- if (cur + adj < 0)
- return 0;
- if (cur + adj >= l)
- return l - 1;
+ j = r[cur].rev_index;
+ i = j + adj;
- i = r[cur + adj].rev_index;
+ if (i < 0)
+ return r[0].index;
+ if (i >= l - 1)
+ return r[l - 1].index;
- j = r[cur].rev_index;
+ tmp = i;
if (adj < 0) {
- tmp = i;
- for (k = j; k >= i; k--)
- if (r[k].diff <= r[j].diff)
- tmp = k;
- return r[tmp].index;
- } else if (adj > 0) {
- tmp = i;
- for (k = i + 1; k + i < l; k++)
- if (r[k].diff <= r[i].diff)
- tmp = k;
- return r[tmp].index;
+ for (k = j; k >= i; k--)
+ if (r[k].diff <= r[j].diff)
+ tmp = k;
+ } else {
+ for (k = i + 1; k + i < l; k++)
+ if (r[k].diff <= r[i].diff)
+ tmp = k;
}
- return cur + adj;
+
+ return r[tmp].index;
}
static void rate_control_pid_adjust_rate(struct ieee80211_local *local,
--
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