From 0b91111fb1a164fedbb68a9263afafd10ffa6ec3 Mon Sep 17 00:00:00 2001
From: Loic Poulain <loic.poulain@linaro.org>
Date: Thu, 18 Jun 2020 11:17:42 +0200
Subject: [PATCH] mac80211: Do not report beacon loss if beacon filtering enabled
Git-commit: 0b91111fb1a164fedbb68a9263afafd10ffa6ec3
Patch-mainline: v5.9-rc1
References: jsc#SLE-13430

mac80211.h says: Beacon filter support is advertised with the
IEEE80211_VIF_BEACON_FILTER interface capability. The driver needs to
enable beacon filter support whenever power save is enabled, that is
IEEE80211_CONF_PS is set. When power save is enabled, the stack will
not check for beacon loss and the driver needs to notify about loss
of beacons with ieee80211_beacon_loss().

Some controllers may want to dynamically enable the beacon filter
capabilities on power save entry (CONF_PS) and disable it on exit.
This is the case for the wcn36xx driver which only supports beacon
filtering in PS mode (no CONNECTION_MONITOR support).

When the mac80211 beacon monitor timer expires, the beacon filter
flag must be checked again in case it as been changed in between
(e.g. vif moved to PS mode).

Signed-off-by: Loic Poulain <loic.poulain@linaro.org>
Link: https://lore.kernel.org/r/1592471863-31402-1-git-send-email-loic.poulain@linaro.org
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 net/mac80211/mlme.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index 8b7ca8ddfe20..ac870309b911 100644
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -4563,6 +4563,9 @@ static void ieee80211_sta_bcn_mon_timer(struct timer_list *t)
 	if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
 		return;
 
+	if (sdata->vif.driver_flags & IEEE80211_VIF_BEACON_FILTER)
+		return;
+
 	sdata->u.mgd.connection_loss = false;
 	ieee80211_queue_work(&sdata->local->hw,
 			     &sdata->u.mgd.beacon_connection_loss_work);
-- 
2.16.4