commit 0217eefa64509d63fbe8d1205310bafb2355cf4d
author Felix Fietkau <nbd@nbd.name> Wed Dec 14 20:46:59 2016 +0100
committer Johannes Berg <johannes.berg@intel.com> Thu Dec 15 11:07:52 2016 +0100
tree 7cb77309a9e60c57f211791537ab3835d2eb7531
parent 1109dc392ea0248f7bfca3537011aa7afaa05cee

mac80211: minstrel: reduce MINSTREL_SCALE

The loss of a bit of extra precision does not hurt the calculation, 12
bits is still enough to calculate probabilities well. Reducing the scale
makes it easier to avoid overflows

Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

net/mac80211/rc80211_minstrel.h

diff --git a/net/mac80211/rc80211_minstrel.h b/net/mac80211/rc80211_minstrel.h
index 94b89b1..03716fd 100644
--- a/net/mac80211/rc80211_minstrel.h
+++ b/net/mac80211/rc80211_minstrel.h
@@ -14,7 +14,7 @@
 #define SAMPLE_COLUMNS	10	/* number of columns in sample table */
 
 /* scaled fraction values */
-#define MINSTREL_SCALE  16
+#define MINSTREL_SCALE  12
 #define MINSTREL_FRAC(val, div) (((val) << MINSTREL_SCALE) / div)
 #define MINSTREL_TRUNC(val) ((val) >> MINSTREL_SCALE)