linux-kernel - Re: [PATCH 1/5 v3] iio: exynos_adc: use indio_dev->dev structure to handle child nodes

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Date:	Wed, 30 Apr 2014 21:43:45 +0100
From:	Jonathan Cameron <jic23@...nel.org>
To:	Naveen Krishna Chatradhi <ch.naveen@...sung.com>,
	linux-iio@...r.kernel.org
CC:	linux-kernel@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
	dianders@...omium.org, gregkh@...uxfoundation.org,
	naveenkrishna.ch@...il.com, lars@...afoo.de, cpgs@...sung.com,
	grundler@...omium.org, t.figa@...sung.com
Subject: Re: [PATCH 1/5 v3] iio: exynos_adc: use indio_dev->dev structure
 to handle child nodes

On 30/04/14 10:26, Naveen Krishna Chatradhi wrote:
> From: Naveen Krishna Ch <ch.naveen@...sung.com>
>
> Using pdev->dev with device_for_each_child() would iterate over all
> of the children of the platform device and delete them.
> Thus, causing crashes during module unload.
>
> We should be using the indio_dev->dev structure for
> registering/unregistering child nodes.
>
> Signed-off-by: Naveen Krishna Ch <ch.naveen@...sung.com>
> Reported-by: Doug Anderson <dianders@...omium.org>
> Reviewed-by: Doug Anderson <dianders@...omium.org>
> Tested-by: Doug Anderson <dianders@...omium.org>
This one has been in my fixes-togreg branch for a few days and
a pull request has gone to Greg.
> ---
> Changes since v2:
> None
> Changes since v1:
> Adding Doug's tags
> v0:
> This change was tested on top of
>     https://lkml.org/lkml/2014/4/21/481 from Doug.
>
>   drivers/iio/adc/exynos_adc.c |    6 +++---
>   1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/iio/adc/exynos_adc.c b/drivers/iio/adc/exynos_adc.c
> index d25b262..affa93f 100644
> --- a/drivers/iio/adc/exynos_adc.c
> +++ b/drivers/iio/adc/exynos_adc.c
> @@ -344,7 +344,7 @@ static int exynos_adc_probe(struct platform_device *pdev)
>
>   	exynos_adc_hw_init(info);
>
> -	ret = of_platform_populate(np, exynos_adc_match, NULL, &pdev->dev);
> +	ret = of_platform_populate(np, exynos_adc_match, NULL, &indio_dev->dev);
>   	if (ret < 0) {
>   		dev_err(&pdev->dev, "failed adding child nodes\n");
>   		goto err_of_populate;
> @@ -353,7 +353,7 @@ static int exynos_adc_probe(struct platform_device *pdev)
>   	return 0;
>
>   err_of_populate:
> -	device_for_each_child(&pdev->dev, NULL,
> +	device_for_each_child(&indio_dev->dev, NULL,
>   				exynos_adc_remove_devices);
>   	regulator_disable(info->vdd);
>   	clk_disable_unprepare(info->clk);
> @@ -369,7 +369,7 @@ static int exynos_adc_remove(struct platform_device *pdev)
>   	struct iio_dev *indio_dev = platform_get_drvdata(pdev);
>   	struct exynos_adc *info = iio_priv(indio_dev);
>
> -	device_for_each_child(&pdev->dev, NULL,
> +	device_for_each_child(&indio_dev->dev, NULL,
>   				exynos_adc_remove_devices);
>   	regulator_disable(info->vdd);
>   	clk_disable_unprepare(info->clk);
>

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