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mac80211: minstrel_ht: fix issue in calculating success probability

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Missing braces in a macro were leading to badly working rates sometimes
getting a success probabilty of 1.0

Signed-off-by: Felix Fietkau <nbd@nbd.name>
(cherry-picked from commit 12cb52bd06)
This commit is contained in:
Felix Fietkau 2021-04-28 21:06:36 +02:00
parent 6f053e5b4f
commit f066ee2ad5
1 changed files with 21 additions and 0 deletions
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package/kernel/mac80211/patches/subsys/353-mac80211-minstrel_ht-fix-MINSTREL_FRAC-macro.patch Normal file
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@ -0,0 +1,21 @@
From: Felix Fietkau <nbd@nbd.name>
Date: Wed, 28 Apr 2021 21:03:13 +0200
Subject: [PATCH] mac80211: minstrel_ht: fix MINSTREL_FRAC macro
Add missing braces to avoid issues with e.g. using additions in the
div expression
Signed-off-by: Felix Fietkau <nbd@nbd.name>
---
--- a/net/mac80211/rc80211_minstrel_ht.h
+++ b/net/mac80211/rc80211_minstrel_ht.h
@@ -14,7 +14,7 @@
/* scaled fraction values */
#define MINSTREL_SCALE 12
-#define MINSTREL_FRAC(val, div) (((val) << MINSTREL_SCALE) / div)
+#define MINSTREL_FRAC(val, div) (((val) << MINSTREL_SCALE) / (div))
#define MINSTREL_TRUNC(val) ((val) >> MINSTREL_SCALE)
#define EWMA_LEVEL 96 /* ewma weighting factor [/EWMA_DIV] */