mac80211: fix minstrel sample time check

We need to skip sampling if the next sample time is after jiffies, not before. This patch fixes an issue where in some cases only very little sampling (or none at all) is performed, leading to really bad data rates Signed-off-by: Felix Fietkau <[email protected]>
ozdroid · Jun 17, 2021 · a4e2bd5 · a4e2bd5
1 parent f89a6ad
commit a4e2bd5
Showing 1 changed file with 23 additions and 0 deletions.
diff --git a/package/kernel/mac80211/patches/subsys/377-mac80211-minstrel_ht-fix-sample-time-check.patch b/package/kernel/mac80211/patches/subsys/377-mac80211-minstrel_ht-fix-sample-time-check.patch
@@ -0,0 +1,23 @@
+From: Felix Fietkau <[email protected]>
+Date: Thu, 17 Jun 2021 12:05:54 +0200
+Subject: [PATCH] mac80211: minstrel_ht: fix sample time check
+
+We need to skip sampling if the next sample time is after jiffies, not before.
+This patch fixes an issue where in some cases only very little sampling (or none
+at all) is performed, leading to really bad data rates
+
+Fixes: 80d55154b2f8 ("mac80211: minstrel_ht: significantly redesign the rate probing strategy")
+Signed-off-by: Felix Fietkau <[email protected]>
+---
+
+--- a/net/mac80211/rc80211_minstrel_ht.c
++++ b/net/mac80211/rc80211_minstrel_ht.c
+@@ -1498,7 +1498,7 @@ minstrel_ht_get_rate(void *priv, struct
+ 	    (info->control.flags & IEEE80211_TX_CTRL_PORT_CTRL_PROTO))
+ 		return;
+
+-	if (time_is_before_jiffies(mi->sample_time))
++	if (time_is_after_jiffies(mi->sample_time))
+ 		return;
+
+ 	mi->sample_time = jiffies + MINSTREL_SAMPLE_INTERVAL;