linux-kernel - [PATCH 5.19 247/717] wifi: mt76: mt7921: add mt7921_mutex_acquire at mt7921_sta_set_decap

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Date:   Sat, 22 Oct 2022 09:22:06 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Lorenzo Bianconi <lorenzo@...nel.org>,
        Sean Wang <sean.wang@...iatek.com>,
        Felix Fietkau <nbd@....name>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.19 247/717] wifi: mt76: mt7921: add mt7921_mutex_acquire at mt7921_sta_set_decap_offload

From: Sean Wang <sean.wang@...iatek.com>

[ Upstream commit 59c20b91786d5f140ee7be2f24c242b5f8986046 ]

Add mt7921_mutex_acquire at mt7921_[start, stop]_ap to fix the race
with the context holding dev->muxtex and the driver might access the
device in low power state.

Fixes: 24299fc869f7 ("mt76: mt7921: enable rx header traslation offload")
Tested-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
Acked-by: Lorenzo Bianconi <lorenzo@...nel.org>
Signed-off-by: Sean Wang <sean.wang@...iatek.com>
Signed-off-by: Felix Fietkau <nbd@....name>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/wireless/mediatek/mt76/mt7921/main.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/main.c b/drivers/net/wireless/mediatek/mt76/mt7921/main.c
index 22c9793e4a40..0316d226e38d 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7921/main.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/main.c
@@ -1390,6 +1390,8 @@ static void mt7921_sta_set_decap_offload(struct ieee80211_hw *hw,
 	struct mt7921_sta *msta = (struct mt7921_sta *)sta->drv_priv;
 	struct mt7921_dev *dev = mt7921_hw_dev(hw);
 
+	mt7921_mutex_acquire(dev);
+
 	if (enabled)
 		set_bit(MT_WCID_FLAG_HDR_TRANS, &msta->wcid.flags);
 	else
@@ -1397,6 +1399,8 @@ static void mt7921_sta_set_decap_offload(struct ieee80211_hw *hw,
 
 	mt76_connac_mcu_sta_update_hdr_trans(&dev->mt76, vif, &msta->wcid,
 					     MCU_UNI_CMD(STA_REC_UPDATE));
+
+	mt7921_mutex_release(dev);
 }
 
 #if IS_ENABLED(CONFIG_IPV6)
-- 
2.35.1