linux-kernel - Re: [PATCH v2 5.2] rsi: Properly initialize data in rsi_sdio_ta

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Message-Id: <20190528113351.44BE460388@smtp.codeaurora.org>
Date:   Tue, 28 May 2019 11:33:50 +0000 (UTC)
From:   Kalle Valo <kvalo@...eaurora.org>
To:     Nathan Chancellor <natechancellor@...il.com>
Cc:     Amitkumar Karwar <amitkarwar@...il.com>,
        Siva Rebbagondla <siva8118@...il.com>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Arnd Bergmann <arnd@...db.de>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        clang-built-linux@...glegroups.com,
        Nathan Chancellor <natechancellor@...il.com>
Subject: Re: [PATCH v2 5.2] rsi: Properly initialize data in rsi_sdio_ta_reset

Nathan Chancellor <natechancellor@...il.com> wrote:

> When building with -Wuninitialized, Clang warns:
> 
> drivers/net/wireless/rsi/rsi_91x_sdio.c:940:43: warning: variable 'data'
> is uninitialized when used here [-Wuninitialized]
>         put_unaligned_le32(TA_HOLD_THREAD_VALUE, data);
>                                                  ^~~~
> drivers/net/wireless/rsi/rsi_91x_sdio.c:930:10: note: initialize the
> variable 'data' to silence this warning
>         u8 *data;
>                 ^
>                  = NULL
> 1 warning generated.
> 
> Using Clang's suggestion of initializing data to NULL wouldn't work out
> because data will be dereferenced by put_unaligned_le32. Use kzalloc to
> properly initialize data, which matches a couple of other places in this
> driver.
> 
> Fixes: e5a1ecc97e5f ("rsi: add firmware loading for 9116 device")
> Link: https://github.com/ClangBuiltLinux/linux/issues/464
> Signed-off-by: Nathan Chancellor <natechancellor@...il.com>

Patch applied to wireless-drivers.git, thanks.

f57b5d85ed58 rsi: Properly initialize data in rsi_sdio_ta_reset

-- 
https://patchwork.kernel.org/patch/10958063/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches