linux-kernel - Re: [PATCH 2/2] mt76: mt7921: remove incorrect error handling

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Date:   Thu, 25 Feb 2021 13:41:23 -0800
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Arnd Bergmann <arnd@...nel.org>
Cc:     Felix Fietkau <nbd@....name>,
        Lorenzo Bianconi <lorenzo.bianconi83@...il.com>,
        Kalle Valo <kvalo@...eaurora.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Arnd Bergmann <arnd@...db.de>,
        Ryder Lee <ryder.lee@...iatek.com>,
        Nathan Chancellor <nathan@...nel.org>,
        Sean Wang <sean.wang@...iatek.com>,
        Soul Huang <Soul.Huang@...iatek.com>,
        linux-wireless <linux-wireless@...r.kernel.org>,
        Network Development <netdev@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linux-mediatek@...ts.infradead.org,
        LKML <linux-kernel@...r.kernel.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>
Subject: Re: [PATCH 2/2] mt76: mt7921: remove incorrect error handling

On Thu, Feb 25, 2021 at 7:00 AM Arnd Bergmann <arnd@...nel.org> wrote:
>
> From: Arnd Bergmann <arnd@...db.de>
>
> Clang points out a mistake in the error handling in
> mt7921_mcu_tx_rate_report(), which tries to dereference a pointer that
> cannot be initialized because of the error that is being handled:
>
> drivers/net/wireless/mediatek/mt76/mt7921/mcu.c:409:3: warning: variable 'stats' is uninitialized when used here [-Wuninitialized]
>                 stats->tx_rate = rate;
>                 ^~~~~
> drivers/net/wireless/mediatek/mt76/mt7921/mcu.c:401:32: note: initialize the variable 'stats' to silence this warning
>         struct mt7921_sta_stats *stats;
>                                       ^
> Just remove the obviously incorrect line.

Yeah, looks like perhaps a small mistake from when the driver was
introduced. Thanks for the patch!
Reviewed-by: Nick Desaulniers <ndesaulniers@...gle.com>

>
> Fixes: 1c099ab44727 ("mt76: mt7921: add MCU support")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  drivers/net/wireless/mediatek/mt76/mt7921/mcu.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
>
> diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/mcu.c b/drivers/net/wireless/mediatek/mt76/mt7921/mcu.c
> index db125cd22b91..b5cc72e7e81c 100644
> --- a/drivers/net/wireless/mediatek/mt76/mt7921/mcu.c
> +++ b/drivers/net/wireless/mediatek/mt76/mt7921/mcu.c
> @@ -405,10 +405,8 @@ mt7921_mcu_tx_rate_report(struct mt7921_dev *dev, struct sk_buff *skb,
>         if (wlan_idx >= MT76_N_WCIDS)
>                 return;
>         wcid = rcu_dereference(dev->mt76.wcid[wlan_idx]);
> -       if (!wcid) {
> -               stats->tx_rate = rate;
> +       if (!wcid)
>                 return;
> -       }
>
>         msta = container_of(wcid, struct mt7921_sta, wcid);
>         stats = &msta->stats;
> --
> 2.29.2
>


-- 
Thanks,
~Nick Desaulniers