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From:   Manikanta Pubbisetty <quic_mpubbise@quicinc.com>
To:     <johannes@sipsolutions.net>
CC:     <linux-wireless@vger.kernel.org>,
        Manikanta Pubbisetty <quic_mpubbise@quicinc.com>
Subject: [PATCH] mac80211: Reset MBSSID parameters upon connection
Date:   Wed, 27 Apr 2022 23:53:05 +0530
Message-ID: <20220427182305.11703-1-quic_mpubbise@quicinc.com>
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Currently MBSSID parameters in struct ieee80211_bss_conf
are not reset upon connection. This could be problematic
with some drivers in a scenario where the device first
connects to a non-transmit BSS and then connects to a
transmit BSS of a Multi BSS AP. The MBSSID parameters
which are set after connecting to a non-transmit BSS will
not be reset and the same parameters will be passed on to
the driver during the subsequent connection to a transmit
BSS of a Multi BSS AP.

For example, firmware running on the ath11k device uses the
Multi BSS data for tracking the beacon of a non-transmit BSS
and reports the driver when there is a beacon miss. If we do
not reset the MBSSID parameters during the subsequent
connection to a transmit BSS, then the driver would have
wrong MBSSID data and FW would be looking for an incorrect
BSSID in the MBSSID beacon of a Multi BSS AP and reports
beacon loss leading to an unstable connection.

Reset the MBSSID parameters upon every connection to solve this
problem.

Signed-off-by: Manikanta Pubbisetty <quic_mpubbise@quicinc.com>
---
 net/mac80211/mlme.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index b857915881e0..07a96f7c5dc3 100644
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -3657,6 +3657,12 @@ static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
 				cbss->transmitted_bss->bssid);
 		bss_conf->bssid_indicator = cbss->max_bssid_indicator;
 		bss_conf->bssid_index = cbss->bssid_index;
+	} else {
+		bss_conf->nontransmitted = false;
+		memset(bss_conf->transmitter_bssid, 0,
+		       sizeof(bss_conf->transmitter_bssid));
+		bss_conf->bssid_indicator = 0;
+		bss_conf->bssid_index = 0;
 	}
 
 	/*
-- 
2.35.1