From 59c20b91786d5f140ee7be2f24c242b5f8986046 Mon Sep 17 00:00:00 2001
From: Sean Wang <sean.wang@mediatek.com>
Date: Fri, 29 Jul 2022 22:44:57 +0800
Subject: [PATCH] wifi: mt76: mt7921: add mt7921_mutex_acquire at
 mt7921_sta_set_decap_offload
Git-commit: 59c20b91786d5f140ee7be2f24c242b5f8986046
References: git-fixes
Patch-mainline: v6.1-rc1

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: Oliver Neukum <oneukum@suse.com>
---
 drivers/net/wireless/mediatek/mt76/mt7921/main.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/drivers/net/wireless/mediatek/mt76/mt7921/main.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/main.c
@@ -1130,6 +1130,8 @@ static void mt7921_sta_set_decap_offload
 	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
@@ -1137,6 +1139,8 @@ static void mt7921_sta_set_decap_offload
 
 	mt76_connac_mcu_sta_update_hdr_trans(&dev->mt76, vif, &msta->wcid,
 					     MCU_UNI_CMD_STA_REC_UPDATE);
+
+	mt7921_mutex_release(dev);
 }
 
 static int mt7921_set_sar_specs(struct ieee80211_hw *hw,