linux-kernel - Re: [PATCH] pinctrl: sunxi: fix theoretical uninitialized variable access

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Message-ID: <CACRpkdYS_C7FVT7LqBsC1izjJJn_GB1Dc6FEe-XBObfGXuVi9w@mail.gmail.com>
Date:   Wed, 16 Nov 2016 20:54:10 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Maxime Ripard <maxime.ripard@...e-electrons.com>,
        Chen-Yu Tsai <wens@...e.org>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] pinctrl: sunxi: fix theoretical uninitialized variable access

On Wed, Nov 16, 2016 at 3:18 PM, Arnd Bergmann <arnd@...db.de> wrote:

> gcc warns about a  way that it could use an uninitialized variable:
>
> drivers/pinctrl/sunxi/pinctrl-sunxi.c: In function 'sunxi_pinctrl_init':
> drivers/pinctrl/sunxi/pinctrl-sunxi.c:1191:8: error: 'best_div' may be used uninitialized in this function [-Werror=maybe-uninitialized]
>
> This cannot really happen except if 'freq' is UINT_MAX and 'clock' is
> zero, and both of these are forbidden. To shut up the warning anyway,
> this changes the logic to initialize the return code to the first
> divider value before looking at the others.
>
> Fixes: 7c926492d38a ("pinctrl: sunxi: Add support for interrupt debouncing")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Patch applied.

Yours,
Linus Walleij