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authorJohannes Berg <johannes.berg@intel.com>2014-05-19 13:24:19 +0400
committerJohannes Berg <johannes.berg@intel.com>2014-05-19 16:30:37 +0400
commit00591cea31e2e07464c5591871bd6d0cf6a89c42 (patch)
tree0608cb8b94597b9911c35c9d508e6a1f5f295bfb /net/mac80211
parent1af586c9116cdf6863823a830593c48cd9bcecde (diff)
downloadlinux-00591cea31e2e07464c5591871bd6d0cf6a89c42.tar.xz
mac80211: minstrel-ht: small clarifications
Antonio and I were looking over this code and some things didn't immediately make sense, so we came up with two small clarifications. Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Diffstat (limited to 'net/mac80211')
-rw-r--r--net/mac80211/rc80211_minstrel_ht.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/net/mac80211/rc80211_minstrel_ht.c b/net/mac80211/rc80211_minstrel_ht.c
index bccaf854a309..4e916ad51a20 100644
--- a/net/mac80211/rc80211_minstrel_ht.c
+++ b/net/mac80211/rc80211_minstrel_ht.c
@@ -22,7 +22,7 @@
#define MCS_NBITS (AVG_PKT_SIZE << 3)
/* Number of symbols for a packet with (bps) bits per symbol */
-#define MCS_NSYMS(bps) ((MCS_NBITS + (bps) - 1) / (bps))
+#define MCS_NSYMS(bps) DIV_ROUND_UP(MCS_NBITS, (bps))
/* Transmission time (nanoseconds) for a packet containing (syms) symbols */
#define MCS_SYMBOL_TIME(sgi, syms) \
@@ -226,8 +226,9 @@ minstrel_ht_calc_tp(struct minstrel_ht_sta *mi, int group, int rate)
nsecs = 1000 * mi->overhead / MINSTREL_TRUNC(mi->avg_ampdu_len);
nsecs += minstrel_mcs_groups[group].duration[rate];
- tp = 1000000 * ((prob * 1000) / nsecs);
+ /* prob is scaled - see MINSTREL_FRAC above */
+ tp = 1000000 * ((prob * 1000) / nsecs);
mr->cur_tp = MINSTREL_TRUNC(tp);
}