From: Sean Wang sean.wang@mediatek.com
[ Upstream commit 52b44015f031f629f1ce1d73415a2017593c7ade ]
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: 9d958b60ebc2 ("mt76: mt7921: fix command timeout in AP stop period") Tested-by: AngeloGioacchino Del Regno angelogioacchino.delregno@collabora.com Signed-off-by: Sean Wang sean.wang@mediatek.com Acked-by: Lorenzo Bianconi lorenzo@kernel.org Signed-off-by: Felix Fietkau nbd@nbd.name Signed-off-by: Sasha Levin sashal@kernel.org --- .../net/wireless/mediatek/mt76/mt7921/main.c | 21 ++++++++++++++----- 1 file changed, 16 insertions(+), 5 deletions(-)
diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/main.c b/drivers/net/wireless/mediatek/mt76/mt7921/main.c index 1438a9f8d1fd..63fd33dcd3af 100644 --- a/drivers/net/wireless/mediatek/mt76/mt7921/main.c +++ b/drivers/net/wireless/mediatek/mt76/mt7921/main.c @@ -1526,17 +1526,23 @@ mt7921_start_ap(struct ieee80211_hw *hw, struct ieee80211_vif *vif, struct mt7921_dev *dev = mt7921_hw_dev(hw); int err;
+ mt7921_mutex_acquire(dev); + err = mt76_connac_mcu_uni_add_bss(phy->mt76, vif, &mvif->sta.wcid, true); if (err) - return err; + goto out;
err = mt7921_mcu_set_bss_pm(dev, vif, true); if (err) - return err; + goto out; + + err = mt7921_mcu_sta_update(dev, NULL, vif, true, + MT76_STA_INFO_STATE_NONE); +out: + mt7921_mutex_release(dev);
- return mt7921_mcu_sta_update(dev, NULL, vif, true, - MT76_STA_INFO_STATE_NONE); + return err; }
static void @@ -1548,11 +1554,16 @@ mt7921_stop_ap(struct ieee80211_hw *hw, struct ieee80211_vif *vif, struct mt7921_dev *dev = mt7921_hw_dev(hw); int err;
+ mt7921_mutex_acquire(dev); + err = mt7921_mcu_set_bss_pm(dev, vif, false); if (err) - return; + goto out;
mt76_connac_mcu_uni_add_bss(phy->mt76, vif, &mvif->sta.wcid, false); + +out: + mt7921_mutex_release(dev); }
const struct ieee80211_ops mt7921_ops = {