This is a note to let you know that I've just added the patch titled mac80211: minstrel_ht: fix sample time check to the 5.12-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: mac80211-minstrel_ht-fix-sample-time-check.patch and it can be found in the queue-5.12 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 1236af327af476731aa548dfcbbefb1a3ec6726a Mon Sep 17 00:00:00 2001 From: Felix Fietkau <nbd@xxxxxxxx> Date: Thu, 17 Jun 2021 12:38:54 +0200 Subject: mac80211: minstrel_ht: fix sample time check From: Felix Fietkau <nbd@xxxxxxxx> commit 1236af327af476731aa548dfcbbefb1a3ec6726a upstream. 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") Cc: stable@xxxxxxxxxxxxxxx Signed-off-by: Felix Fietkau <nbd@xxxxxxxx> Link: https://lore.kernel.org/r/20210617103854.61875-1-nbd@xxxxxxxx Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- net/mac80211/rc80211_minstrel_ht.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/net/mac80211/rc80211_minstrel_ht.c +++ b/net/mac80211/rc80211_minstrel_ht.c @@ -1516,7 +1516,7 @@ 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; Patches currently in stable-queue which might be from nbd@xxxxxxxx are queue-5.12/mac80211-minstrel_ht-fix-sample-time-check.patch