linux-kernel - Re: [PATCH 1/2] mt76: mt7915: fix unused 'mode' variable

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Date:   Thu, 25 Feb 2021 18:00:07 +0200
From:   Kalle Valo <kvalo@...eaurora.org>
To:     Arnd Bergmann <arnd@...nel.org>
Cc:     Felix Fietkau <nbd@....name>,
        Lorenzo Bianconi <lorenzo.bianconi83@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Arnd Bergmann <arnd@...db.de>,
        Ryder Lee <ryder.lee@...iatek.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Shayne Chen <shayne.chen@...iatek.com>,
        Sean Wang <sean.wang@...iatek.com>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        clang-built-linux@...glegroups.com
Subject: Re: [PATCH 1/2] mt76: mt7915: fix unused 'mode' variable

Arnd Bergmann <arnd@...nel.org> writes:

> From: Arnd Bergmann <arnd@...db.de>
>
> clang points out a possible corner case in the mt7915_tm_set_tx_cont()
> function if called with invalid arguments:
>
> drivers/net/wireless/mediatek/mt76/mt7915/testmode.c:593:2: warning: variable 'mode' is used uninitialized whenever switch default is taken [-Wsometimes-uninitialized]
>         default:
>         ^~~~~~~
> drivers/net/wireless/mediatek/mt76/mt7915/testmode.c:597:13: note: uninitialized use occurs here
>         rateval =  mode << 6 | rate_idx;
>                    ^~~~
> drivers/net/wireless/mediatek/mt76/mt7915/testmode.c:506:37: note: initialize the variable 'mode' to silence this warning
>         u8 rate_idx = td->tx_rate_idx, mode;
>                                            ^
>
> Change it to return an error instead of continuing with invalid data
> here.
>
> Fixes: 3f0caa3cbf94 ("mt76: mt7915: add support for continuous tx in testmode")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Felix, can I take these two to wireless-drivers? An ack would be good.

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