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From:   <sean.wang@mediatek.com>
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Subject: [PATCH v4 08/16] mt76: mt7921: make all event parser reusable between mt7921s and mt7921e
Date:   Wed, 13 Oct 2021 06:52:01 +0800
Message-ID: <c626a658a18558750df84bbcb67b68ae9e97590e.1634077769.git.objelf@gmail.com>
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From: Sean Wang <sean.wang@mediatek.com>

The longer event such as the event for mcu_get_nic_capability would hold
the data in paged fragment skb for the SDIO device so we turn the skb to
be linearized skb before accessing it to reuse the same event parser
betweem mt7921s and mt7921e.

Tested-by: Deren Wu <deren.wu@mediatek.com>
Acked-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Sean Wang <sean.wang@mediatek.com>
---
 drivers/net/wireless/mediatek/mt76/mt7921/mcu.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/mcu.c b/drivers/net/wireless/mediatek/mt76/mt7921/mcu.c
index 95f7866b3d57..94d6c3935fb2 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7921/mcu.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/mcu.c
@@ -455,7 +455,12 @@ mt7921_mcu_rx_unsolicited_event(struct mt7921_dev *dev, struct sk_buff *skb)
 
 void mt7921_mcu_rx_event(struct mt7921_dev *dev, struct sk_buff *skb)
 {
-	struct mt7921_mcu_rxd *rxd = (struct mt7921_mcu_rxd *)skb->data;
+	struct mt7921_mcu_rxd *rxd;
+
+	if (skb_linearize(skb))
+		return;
+
+	rxd = (struct mt7921_mcu_rxd *)skb->data;
 
 	if (rxd->eid == 0x6) {
 		mt76_mcu_rx_event(&dev->mt76, skb);
-- 
2.25.1