linux-kernel - Re: [PATCH v3 5/7] gpio: Add GPIO Aggregator/Repeater driver

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Date:   Wed, 27 Nov 2019 15:15:29 +0100
From:   Eugeniu Rosca <erosca@...adit-jv.com>
To:     Geert Uytterhoeven <geert+renesas@...der.be>
CC:     Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Jonathan Corbet <corbet@....net>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Harish Jenny K N <harish_kandiga@...tor.com>,
        Eugeniu Rosca <erosca@...adit-jv.com>,
        Alexander Graf <graf@...zon.com>,
        Peter Maydell <peter.maydell@...aro.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Phil Reid <preid@...ctromag.com.au>,
        Marc Zyngier <marc.zyngier@....com>,
        Christoffer Dall <christoffer.dall@....com>,
        Magnus Damm <magnus.damm@...il.com>,
        <linux-gpio@...r.kernel.org>, <linux-doc@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-renesas-soc@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <qemu-devel@...gnu.org>,
        Eugeniu Rosca <roscaeugeniu@...il.com>
Subject: Re: [PATCH v3 5/7] gpio: Add GPIO Aggregator/Repeater driver

Hi Geert,

Many thanks for the series upgrade.
A few static-analysis findings below (could be false positives).

On Wed, Nov 27, 2019 at 09:42:51AM +0100, Geert Uytterhoeven wrote:

[..]

> +static bool isrange(const char *s)
> +{
> +	size_t n = strlen(s);

Cppcheck 1.40-18521-ge6d692d96058:
drivers/gpio/gpio-aggregator.c:69:11: style: Variable 'n' is assigned a value that is never used. [unreadVariable]

Smatch v0.5.0-6150-gc1ed13e4ee7b:
drivers/gpio/gpio-aggregator.c:69 isrange() warn: unused return: n = strlen()

[..]

> +	aggr->lookups->dev_id = kasprintf(GFP_KERNEL, "%s.%d", DRV_NAME, id);
> +	if (!aggr->lookups) {
> +		res = -ENOMEM;
> +		goto remove_idr;
> +	}

s/aggr->lookups/aggr->lookups->dev_id/ ?

[..]

> +static int gpio_fwd_get_multiple(struct gpio_chip *chip, unsigned long *mask,
> +				 unsigned long *bits)
> +{
> +	struct gpiochip_fwd *fwd = gpiochip_get_data(chip);
> +	unsigned long *values, flags;

gcc 9.2.1:
warning: ‘flags’ may be used uninitialized in this function [-Wmaybe-uninitialized]

[..]

> +static void gpio_fwd_set_multiple(struct gpio_chip *chip, unsigned long *mask,
> +				  unsigned long *bits)
> +{
> +	struct gpiochip_fwd *fwd = gpiochip_get_data(chip);
> +	unsigned long *values, flags;

gcc 9.2.1, same as above:
warning: ‘flags’ may be used uninitialized in this function [-Wmaybe-uninitialized]

Should these be silenced like in 2bf593f101f3ca ("xilinx_uartps.c:
suppress "may be used uninitialised" warning") ?

I plan to do some runtime testing soon.

-- 
Best Regards,
Eugeniu