Re: [PATCH v2 08/16] mt76: mt7921: make all event parser reusable between mt7921s and mt7921e

From: Lorenzo Bianconi <lorenzo.bianconi@redhat.com>
To: sean.wang@mediatek.com
Cc: nbd@nbd.name, Soul.Huang@mediatek.com, YN.Chen@mediatek.com,
	Leon.Yen@mediatek.com, Eric-SY.Chang@mediatek.com,
	Deren.Wu@mediatek.com, km.lin@mediatek.com,
	robin.chiu@mediatek.com, Eddie.Chen@mediatek.com,
	ch.yeh@mediatek.com, posh.sun@mediatek.com,
	ted.huang@mediatek.com, Eric.Liang@mediatek.com,
	Stella.Chang@mediatek.com, steve.lee@mediatek.com,
	jsiuda@google.com, frankgor@google.com, jemele@google.com,
	shawnku@google.com, linux-wireless@vger.kernel.org,
	linux-mediatek@lists.infradead.org
Subject: Re: [PATCH v2 08/16] mt76: mt7921: make all event parser reusable between mt7921s and mt7921e
Date: Sat, 18 Sep 2021 12:16:02 +0200	[thread overview]
Message-ID: <YUW8YqCxSYiKUF9o@lore-desk> (raw)
In-Reply-To: <a6aebd446a9aa7902397a7e7b87fe427076fc9df.1631918993.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>
> Signed-off-by: Sean Wang <sean.wang@mediatek.com>
> ---
>  drivers/net/wireless/mediatek/mt76/mt7921/mcu.c | 9 ++++++++-
>  1 file changed, 8 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/mcu.c b/drivers/net/wireless/mediatek/mt76/mt7921/mcu.c
> index 866b8797f16e..863781895652 100644
> --- a/drivers/net/wireless/mediatek/mt76/mt7921/mcu.c
> +++ b/drivers/net/wireless/mediatek/mt76/mt7921/mcu.c
> @@ -456,7 +456,14 @@ 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;
> +	int ret;
> +
> +	ret = skb_linearize(skb);

nit: we do not need ret variable here:

	if (skb_linearize(skb))
		return;

> +	if (ret)
> +		return;
> +
> +	rxd = (struct mt7921_mcu_rxd *)skb->data;
>  
>  	if (rxd->eid == 0x6) {
>  		mt76_mcu_rx_event(&dev->mt76, skb);
> -- 
> 2.25.1
> 

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