linux-kernel - Re: [PATCH] of: provide of_platform

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Date:	Mon, 22 Jul 2013 10:25:34 +0200
From:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:	ch.naveen@...sung.com
CC:	Rob Herring <rob.herring@...xeda.com>,
	Grant Likely <grant.likely@...aro.org>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	"linux-samsung-soc@...r.kernel.org" 
	<linux-samsung-soc@...r.kernel.org>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Tony Lindgren <tony@...mide.com>,
	Doug Anderson <dianders@...omium.org>,
	Vivek Gautam <gautam.vivek@...sung.com>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Kishon Vijay Abraham I <kishon@...com>,
	Roger Quadros <rogerq@...com>,
	George Cherian <george.cherian@...com>,
	Felipe Balbi <balbi@...com>
Subject: Re: [PATCH] of: provide of_platform_unpopulate()

On 07/20/2013 07:42 AM, NAVEEN KRISHNA CHATRADHI wrote:
> Hello Sebastian,

Hello Naveen,

> 
> I just did one more testing.
> 
> In case of iio/adc/exynos_adc.c there is a bug in the remove path.
> If I fix the bug in the driver, with below patch
> 
> --- a/drivers/iio/adc/exynos_adc.c
> +++ b/drivers/iio/adc/exynos_adc.c
> @@ -375,14 +375,14 @@ 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,
> -                               exynos_adc_remove_devices);
>         regulator_disable(info->vdd);
>         clk_disable_unprepare(info->clk);
>         writel(0, info->enable_reg);
>         iio_device_unregister(indio_dev);
>         free_irq(info->irq, info);
>         iio_device_free(indio_dev);
> +       device_for_each_child(&pdev->dev, NULL,
> +                               exynos_adc_remove_devices);
> 
> Even without your fix, I could configure it as a module and the rmmod, insmod are working fine. (no crash)

I have no idea why you moved it. I haven't found any .dts with this
binding but from the binding document I would assume that you do not
have any memory resources and therefore you don't see that crash.

> Regards,
> Naveen

Sebastian
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