netdev - Re: [PATCH] wifi: mt76: mt7921: fix missing unwind goto in `mt7921u

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Date:   Wed, 12 Apr 2023 09:12:52 -0500
From:   "Samudrala, Sridhar" <sridhar.samudrala@...el.com>
To:     Jiefeng Li <jiefeng_li@...t.edu.cn>, Felix Fietkau <nbd@....name>,
        "Lorenzo Bianconi" <lorenzo@...nel.org>,
        Ryder Lee <ryder.lee@...iatek.com>,
        "Shayne Chen" <shayne.chen@...iatek.com>,
        Sean Wang <sean.wang@...iatek.com>,
        "Kalle Valo" <kvalo@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        "Eric Dumazet" <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
CC:     Dongliang Mu <dzm91@...t.edu.cn>, <linux-wireless@...r.kernel.org>,
        <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>
Subject: Re: [PATCH] wifi: mt76: mt7921: fix missing unwind goto in
 `mt7921u_probe`



On 4/12/2023 1:22 AM, Jiefeng Li wrote:
> `mt7921u_dma_init` can only return zero or negative number according to its
> definition. When it returns non-zero number, there exists an error and this
> function should handle this error rather than return directly.
> 
> Fixes: 0d2afe09fad5 ("mt76: mt7921: add mt7921u driver")
> Signed-off-by: Jiefeng Li <jiefeng_li@...t.edu.cn>
> Reviewed-by: Dongliang Mu <dzm91@...t.edu.cn>

Reviewed-by: Sridhar Samudrala <sridhar.samudrala@...el.com>

> ---
> The issue is discovered by static analysis, and the patch is not tested yet.
> ---
>   drivers/net/wireless/mediatek/mt76/mt7921/usb.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/usb.c b/drivers/net/wireless/mediatek/mt76/mt7921/usb.c
> index 8fef09ed29c9..70c9bbdbf60e 100644
> --- a/drivers/net/wireless/mediatek/mt76/mt7921/usb.c
> +++ b/drivers/net/wireless/mediatek/mt76/mt7921/usb.c
> @@ -272,7 +272,7 @@ static int mt7921u_probe(struct usb_interface *usb_intf,
>   
>   	ret = mt7921u_dma_init(dev, false);
>   	if (ret)
> -		return ret;
> +		goto error;
>   
>   	hw = mt76_hw(dev);
>   	/* check hw sg support in order to enable AMSDU */