linux-kernel - [PATCH AUTOSEL 5.0 04/98] mt76x02: fix hdr pointer in write txwi for USB

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Message-Id: <20190422194205.10404-4-sashal@kernel.org>
Date:   Mon, 22 Apr 2019 15:40:31 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Stanislaw Gruszka <sgruszka@...hat.com>,
        Felix Fietkau <nbd@....name>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH AUTOSEL 5.0 04/98] mt76x02: fix hdr pointer in write txwi for USB

From: Stanislaw Gruszka <sgruszka@...hat.com>

[ Upstream commit 7b25d3b8e485c7721cba9c71b44d1c286e61c8e7 ]

Since we add txwi at the begining of skb->data, it no longer point
to ieee80211_hdr. This breaks settings TS bit for probe response and
beacons.

Acked-by: Lorenzo Bianconi <lorenzo.bianconi@...hat.com>
Signed-off-by: Stanislaw Gruszka <sgruszka@...hat.com>
Signed-off-by: Felix Fietkau <nbd@....name>
Signed-off-by: Sasha Levin (Microsoft) <sashal@...nel.org>
---
 drivers/net/wireless/mediatek/mt76/mt76x02_usb_core.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/mediatek/mt76/mt76x02_usb_core.c b/drivers/net/wireless/mediatek/mt76/mt76x02_usb_core.c
index 81970cf777c0..8cafa5a749ca 100644
--- a/drivers/net/wireless/mediatek/mt76/mt76x02_usb_core.c
+++ b/drivers/net/wireless/mediatek/mt76/mt76x02_usb_core.c
@@ -81,8 +81,9 @@ int mt76x02u_tx_prepare_skb(struct mt76_dev *mdev, void *data,
 
 	mt76x02_insert_hdr_pad(skb);
 
-	txwi = skb_push(skb, sizeof(struct mt76x02_txwi));
+	txwi = (struct mt76x02_txwi *)(skb->data - sizeof(struct mt76x02_txwi));
 	mt76x02_mac_write_txwi(dev, txwi, skb, wcid, sta, len);
+	skb_push(skb, sizeof(struct mt76x02_txwi));
 
 	pid = mt76_tx_status_skb_add(mdev, wcid, skb);
 	txwi->pktid = pid;
-- 
2.19.1