linux-kernel - Re: [PATCH] [extcon]:remove freed groups caused the panic or warning in unregister flow

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Date:	Mon, 04 Nov 2013 10:43:17 +0900
From:	Chanwoo Choi <cw00.choi@...sung.com>
To:	"Wang, Xiaoming" <xiaoming.wang@...el.com>
Cc:	myungjoo.ham@...sung.com, linux-kernel@...r.kernel.org,
	chuansheng.liu@...el.com, dongxing.zhang@...el.com
Subject: Re: [PATCH] [extcon]:remove freed groups caused the panic or warning
 in unregister flow

Hi Wang,

>  drivers/extcon/extcon-class.c |    3 ++-
>  1 files changed, 2 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/extcon/extcon-class.c b/drivers/extcon/extcon-class.c
> index 148382f..48f4669 100644
> --- a/drivers/extcon/extcon-class.c
> +++ b/drivers/extcon/extcon-class.c
> @@ -794,6 +794,8 @@ void extcon_dev_unregister(struct extcon_dev *edev)
>  		return;
>  	}
>  
> +	device_unregister(edev->dev);
> +
>  	if (edev->mutually_exclusive && edev->max_supported) {
>  		for (index = 0; edev->mutually_exclusive[index];
>  				index++)
> @@ -814,7 +816,6 @@ void extcon_dev_unregister(struct extcon_dev *edev)
>  	if (switch_class)
>  		class_compat_remove_link(switch_class, edev->dev, NULL);
>  #endif
> -	device_unregister(edev->dev);
>  	put_device(edev->dev);
>  }
>  EXPORT_SYMBOL_GPL(extcon_dev_unregister);
> 

I think we could only apply following patch instead of moving the position of device_unregister().

diff --git a/drivers/extcon/extcon-class.c b/drivers/extcon/extcon-class.c
index 148382f..ff27b19 100644
--- a/drivers/extcon/extcon-class.c
+++ b/drivers/extcon/extcon-class.c
@@ -805,10 +805,8 @@ void extcon_dev_unregister(struct extcon_dev *edev)
        for (index = 0; index < edev->max_supported; index++)
                kfree(edev->cables[index].attr_g.name);
 
-       if (edev->max_supported) {
-               kfree(edev->extcon_dev_type.groups);
+       if (edev->max_supported)
                kfree(edev->cables);
-       }
 
 #if defined(CONFIG_ANDROID)
        if (switch_class)

Thanks,
Chanwoo Choi

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