[PATCH 5.19 247/717] wifi: mt76: mt7921: add mt7921_mutex_acquire at mt7921_sta_set_decap_offload

Greg Kroah-Hartman
2022-10-22T07:53:32Z

From: Sean Wang <sean.wang@mediatek.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@collabora.com>
Acked-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Sasha Levin <sashal@kernel.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