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

[Nick Desaulniers <ndesaulniers@google.com>]

On Thu, Feb 25, 2021 at 7:00 AM Arnd Bergmann <arnd@kernel.org> wrote:
>
> From: Arnd Bergmann <arnd@arndb.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@google.com>

>
> Fixes: 1c099ab44727 ("mt76: mt7921: add MCU support")
> Signed-off-by: Arnd Bergmann <arnd@arndb.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