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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Lorenzo Bianconi <lorenzo@kernel.org>,
        Felix Fietkau <nbd@nbd.name>, Sasha Levin <sashal@kernel.org>
Subject: [PATCH 5.9 315/757] mt76: mt7615: hold mt76 lock queueing wd in mt7615_queue_key_update
Date:   Tue, 27 Oct 2020 14:49:25 +0100
Message-Id: <20201027135505.316423767@linuxfoundation.org>
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From: Lorenzo Bianconi <lorenzo@kernel.org>

[ Upstream commit cddaaa56375615c256eb6960d3092ddb8a7a9154 ]

wq queue is always updated holding mt76 spinlock. Grab mt76 lock in
mt7615_queue_key_update() before putting a new element at the end of the
queue.

Fixes: eb99cc95c3b65 ("mt76: mt7615: introduce mt7663u support")
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/net/wireless/mediatek/mt76/mt7615/main.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7615/main.c b/drivers/net/wireless/mediatek/mt76/mt7615/main.c
index 2d0b1f49fdbcf..bafe2bdeb5eb4 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7615/main.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7615/main.c
@@ -361,7 +361,10 @@ mt7615_queue_key_update(struct mt7615_dev *dev, enum set_key_cmd cmd,
 	wd->key.keylen = key->keylen;
 	wd->key.cmd = cmd;
 
+	spin_lock_bh(&dev->mt76.lock);
 	list_add_tail(&wd->node, &dev->wd_head);
+	spin_unlock_bh(&dev->mt76.lock);
+
 	queue_work(dev->mt76.wq, &dev->wtbl_work);
 
 	return 0;
-- 
2.25.1