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Date:   Tue, 10 Oct 2023 16:33:46 +0100
From:   Jonathan Cameron <jic23@kernel.org>
To:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@collabora.com>
Cc:     lars@metafoo.de, matthias.bgg@gmail.com, ruanjinjie@huawei.com,
        linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org,
        linux-mediatek@lists.infradead.org, wenst@chromium.org,
        kernel@collabora.com
Subject: Re: [PATCH] iio: adc: mt6577_auxadc: Fix kernel panic on suspend
Message-ID: <20231010163346.3e346536@jic23-huawei>
In-Reply-To: <20231010121940.159696-1-angelogioacchino.delregno@collabora.com>
References: <20231010121940.159696-1-angelogioacchino.delregno@collabora.com>
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On Tue, 10 Oct 2023 14:19:40 +0200
AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com> wrote:

> Commit a2d518fbe376 ("iio: adc: mt6577_auxadc: Simplify with device managed function")
> simplified the driver with devm hooks, but wrongly states that the
> platform_set_drvdata(), platform_get_drvdata() are unused after the
> simplification: the driver data is infact used in .suspend() and
> .resume() PM callbacks, currently producing a kernel panic.
> 
> Reintroduce the call to platform_set_drvdata() in the probe function
> 
> Fixes: a2d518fbe376 ("iio: adc: mt6577_auxadc: Simplify with device managed function")
> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Applied to the togreg branch of iio.git (as the patch it is fixing is only there for now)
Pushed out initially as testing for 0-day to take a look.

Thanks,

Jonathan

> ---
>  drivers/iio/adc/mt6577_auxadc.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/iio/adc/mt6577_auxadc.c b/drivers/iio/adc/mt6577_auxadc.c
> index 370b84c2d0ba..3343b54e8e44 100644
> --- a/drivers/iio/adc/mt6577_auxadc.c
> +++ b/drivers/iio/adc/mt6577_auxadc.c
> @@ -293,6 +293,7 @@ static int mt6577_auxadc_probe(struct platform_device *pdev)
>  	mt6577_auxadc_mod_reg(adc_dev->reg_base + MT6577_AUXADC_MISC,
>  			      MT6577_AUXADC_PDN_EN, 0);
>  	mdelay(MT6577_AUXADC_POWER_READY_MS);
> +	platform_set_drvdata(pdev, indio_dev);
>  
>  	ret = devm_add_action_or_reset(&pdev->dev, mt6577_power_off, adc_dev);
>  	if (ret)