linux-kernel - [PATCH for v4.9 LTS 68/86] mac80211: initialize SMPS field in HT capabilities

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Date:   Sat, 17 Jun 2017 22:24:51 +0000
From:   "Levin, Alexander (Sasha Levin)" <alexander.levin@...izon.com>
To:     "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Cc:     Felix Fietkau <nbd@....name>,
        Johannes Berg <johannes.berg@...el.com>,
        "Levin, Alexander (Sasha Levin)" <alexander.levin@...izon.com>
Subject: [PATCH for v4.9 LTS 68/86] mac80211: initialize SMPS field in HT
 capabilities

From: Felix Fietkau <nbd@....name>

[ Upstream commit 43071d8fb3b7f589d72663c496a6880fb097533c ]

ibss and mesh modes copy the ht capabilites from the band without
overriding the SMPS state. Unfortunately the default value 0 for the
SMPS field means static SMPS instead of disabled.

This results in HT ibss and mesh setups using only single-stream rates,
even though SMPS is not supposed to be active.

Initialize SMPS to disabled for all bands on ieee80211_hw_register to
ensure that the value is sane where it is not overriden with the real
SMPS state.

Reported-by: Elektra Wagenrad <onelektra@....net>
Signed-off-by: Felix Fietkau <nbd@....name>
[move VHT TODO comment to a better place]
Signed-off-by: Johannes Berg <johannes.berg@...el.com>

Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
---
 net/mac80211/main.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/net/mac80211/main.c b/net/mac80211/main.c
index 1075ac24c8c5..2bb6899854d4 100644
--- a/net/mac80211/main.c
+++ b/net/mac80211/main.c
@@ -908,12 +908,17 @@ int ieee80211_register_hw(struct ieee80211_hw *hw)
 		supp_ht = supp_ht || sband->ht_cap.ht_supported;
 		supp_vht = supp_vht || sband->vht_cap.vht_supported;
 
-		if (sband->ht_cap.ht_supported)
-			local->rx_chains =
-				max(ieee80211_mcs_to_chains(&sband->ht_cap.mcs),
-				    local->rx_chains);
+		if (!sband->ht_cap.ht_supported)
+			continue;
 
 		/* TODO: consider VHT for RX chains, hopefully it's the same */
+		local->rx_chains =
+			max(ieee80211_mcs_to_chains(&sband->ht_cap.mcs),
+			    local->rx_chains);
+
+		/* no need to mask, SM_PS_DISABLED has all bits set */
+		sband->ht_cap.cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
+			             IEEE80211_HT_CAP_SM_PS_SHIFT;
 	}
 
 	/* if low-level driver supports AP, we also support VLAN */
-- 
2.11.0