linux-kernel - Re: [PATCH 2/2] iio: st_sensors: Fix null pointer on defer

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Date:   Mon, 25 Jul 2022 23:24:21 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Matti Lehtimäki <matti.lehtimaki@...il.com>
Cc:     linux-iio <linux-iio@...r.kernel.org>,
        ~postmarketos/upstreaming@...ts.sr.ht,
        Jonathan Cameron <jic23@...nel.org>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Cai Huoqing <cai.huoqing@...ux.dev>,
        Alexandru Ardelean <aardelean@...iqon.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] iio: st_sensors: Fix null pointer on defer_probe error

On Sun, Jul 24, 2022 at 7:01 PM Matti Lehtimäki
<matti.lehtimaki@...il.com> wrote:
>
> dev_err_probe() calls __device_set_deferred_probe_reason()
> on -EPROBE_DEFER error. The device pointer to driver core private
> structure is not yet initialized at this stage for the iio device causing
> a null pointer error. Use parent device instead.

the parent device pointer

...

>         pdata->vdd = devm_regulator_get(parent, "vdd");
>         if (IS_ERR(pdata->vdd))
> -               return dev_err_probe(&indio_dev->dev, PTR_ERR(pdata->vdd),
> +               return dev_err_probe(indio_dev->dev.parent, PTR_ERR(pdata->vdd),
>                                      "unable to get Vdd supply\n");

Why not use the 'parent' variable?

...

>         pdata->vdd_io = devm_regulator_get(parent, "vddio");
>         if (IS_ERR(pdata->vdd_io))
> -               return dev_err_probe(&indio_dev->dev, PTR_ERR(pdata->vdd_io),
> +               return dev_err_probe(indio_dev->dev.parent, PTR_ERR(pdata->vdd_io),

Ditto.

>                                      "unable to get Vdd_IO supply\n");


-- 
With Best Regards,
Andy Shevchenko