linux-kernel - [PATCH AUTOSEL 4.4 02/18] mac80211: correct use of IEEE80211_VHT_CAP_RXSTBC

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Message-ID: <20180924144942.164688-2-alexander.levin@microsoft.com>
Date:   Mon, 24 Sep 2018 14:49:46 +0000
From:   Sasha Levin <Alexander.Levin@...rosoft.com>
To:     "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     Danek Duvall <duvall@...fychair.org>,
        Johannes Berg <johannes.berg@...el.com>,
        Sasha Levin <Alexander.Levin@...rosoft.com>
Subject: [PATCH AUTOSEL 4.4 02/18] mac80211: correct use of
 IEEE80211_VHT_CAP_RXSTBC_X

From: Danek Duvall <duvall@...fychair.org>

[ Upstream commit 67d1ba8a6dc83d90cd58b89fa6cbf9ae35a0cf7f ]

The mod mask for VHT capabilities intends to say that you can override
the number of STBC receive streams, and it does, but only by accident.
The IEEE80211_VHT_CAP_RXSTBC_X aren't bits to be set, but values (albeit
left-shifted).  ORing the bits together gets the right answer, but we
should use the _MASK macro here instead.

Signed-off-by: Danek Duvall <duvall@...fychair.org>
Signed-off-by: Johannes Berg <johannes.berg@...el.com>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
---
 net/mac80211/main.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/net/mac80211/main.c b/net/mac80211/main.c
index 2ee53dc1ddf7..d784d29a4fd6 100644
--- a/net/mac80211/main.c
+++ b/net/mac80211/main.c
@@ -460,10 +460,7 @@ static const struct ieee80211_vht_cap mac80211_vht_capa_mod_mask = {
 		cpu_to_le32(IEEE80211_VHT_CAP_RXLDPC |
 			    IEEE80211_VHT_CAP_SHORT_GI_80 |
 			    IEEE80211_VHT_CAP_SHORT_GI_160 |
-			    IEEE80211_VHT_CAP_RXSTBC_1 |
-			    IEEE80211_VHT_CAP_RXSTBC_2 |
-			    IEEE80211_VHT_CAP_RXSTBC_3 |
-			    IEEE80211_VHT_CAP_RXSTBC_4 |
+			    IEEE80211_VHT_CAP_RXSTBC_MASK |
 			    IEEE80211_VHT_CAP_TXSTBC |
 			    IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE |
 			    IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE |
-- 
2.17.1