linux-kernel - Re: [PATCH] mt76: Fix comparisons with invalid hardware key index

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Message-ID: <20180824080817.GA6651@redhat.com>
Date:   Fri, 24 Aug 2018 10:08:18 +0200
From:   Stanislaw Gruszka <sgruszka@...hat.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Kalle Valo <kvalo@...eaurora.org>,
        "David S . Miller" <davem@...emloft.net>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Lorenzo Bianconi <lorenzo.bianconi@...hat.com>,
        Arnd Bergmann <arnd@...db.de>, 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
Subject: Re: [PATCH] mt76: Fix comparisons with invalid hardware key index

On Thu, Aug 23, 2018 at 11:27:38PM +0200, Geert Uytterhoeven wrote:
> With gcc 4.1.2:
> 
>     drivers/net/wireless/mediatek/mt76/mt76x0/tx.c: In function ‘mt76x0_tx’:
>     drivers/net/wireless/mediatek/mt76/mt76x0/tx.c:169: warning: comparison is always true due to limited range of data type
>     drivers/net/wireless/mediatek/mt76/mt76x2_tx_common.c: In function ‘mt76x2_tx’:
>     drivers/net/wireless/mediatek/mt76/mt76x2_tx_common.c:35: warning: comparison is always true due to limited range of data type
> 
> While assigning -1 to a u8 works fine, comparing with -1 does not work
> as expected.
> 
> Fix this by comparing with 0xff, like is already done in some other
> places.
> 
> Signed-off-by: Geert Uytterhoeven <geert@...ux-m68k.org>

Ack for mt76x0. I think Lorenzo already posted patch for mt76x2.

Thanks
Stanislaw