linux-kernel - Re: [PATCH v5 8/9] pinctrl: axp209: add support for AXP813 GPIOs

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Message-ID: <CACRpkdY8_8BZ6HJV4qE_b9-Ln6TLK_m6DNUpgoh7x61F915nJw@mail.gmail.com>
Date:   Wed, 13 Dec 2017 08:36:39 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Quentin Schulz <quentin.schulz@...e-electrons.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Chen-Yu Tsai <wens@...e.org>,
        Russell King <linux@...linux.org.uk>,
        Maxime Ripard <maxime.ripard@...e-electrons.com>,
        Lee Jones <lee.jones@...aro.org>, linux-gpio@...r.kernel.org,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
        linux-sunxi <linux-sunxi@...glegroups.com>
Subject: Re: [PATCH v5 8/9] pinctrl: axp209: add support for AXP813 GPIOs

On Fri, Dec 8, 2017 at 2:41 PM, Quentin Schulz
<quentin.schulz@...e-electrons.com> wrote:

>> -     pctl->desc = &axp20x_data;
>> +     pctl->desc = (struct axp20x_pctrl_desc *)of_device_get_match_data(dev);
>>       pctl->regmap = axp20x->regmap;
>>       pctl->dev = &pdev->dev;
>>
>
> I am using pctl->desc before retrieving it, thus dereferencing from a
> null pointer.
>
> We just have to move
> pctl->chip.ngpio                = pctl->desc->npins;
> after
> pctl->desc = (struct axp20x_pctrl_desc *)of_device_get_match_data(dev);
>
> Linus, I guess that I should send a patch to fix this or is there an
> other way not to have to apply such a small and dumb patch?

Just send a patch based on my pin control tree "devel" branch or
linux-next, it's cool.

Things like this happens all the time.

Yours,
Linus Walleij