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From: Felix Fietkau <nbd@nbd.name>
Date: Wed, 14 Dec 2016 20:15:33 +0100
Subject: [PATCH] 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>
---
--- 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)
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