linux-kernel - Re: [PATCH v2] platform: x86: huawei-wmi: check the return value of device_create

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Date:   Tue, 8 Mar 2022 15:44:51 +0100
From:   Hans de Goede <hdegoede@...hat.com>
To:     Jia-Ju Bai <baijiaju1990@...il.com>, markgross@...nel.org
Cc:     platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] platform: x86: huawei-wmi: check the return value of
 device_create_file()

Hi,

On 3/3/22 03:24, Jia-Ju Bai wrote:
> The function device_create_file() in huawei_wmi_battery_add() can fail,
> so its return value should be checked.
> 
> Fixes: 355a070b09ab ("platform/x86: huawei-wmi: Add battery charging thresholds")
> Reported-by: TOTE Robot <oslab@...nghua.edu.cn>
> Signed-off-by: Jia-Ju Bai <baijiaju1990@...il.com>
> ---
> v2:
> * Fix the code format.
>   Thank Hans for good advice.

Thank you for your patch, I've applied this patch to my review-hans 
branch:
https://git.kernel.org/pub/scm/linux/kernel/git/pdx86/platform-drivers-x86.git/log/?h=review-hans

Note it will show up in my review-hans branch once I've pushed my
local branch there, which might take a while.

Once I've run some tests on this branch the patches there will be
added to the platform-drivers-x86/for-next branch and eventually
will be included in the pdx86 pull-request to Linus for the next
merge-window.

Regards,

Hans


> 
> ---
>  drivers/platform/x86/huawei-wmi.c | 13 ++++++++++---
>  1 file changed, 10 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/platform/x86/huawei-wmi.c b/drivers/platform/x86/huawei-wmi.c
> index a2d846c4a7ee..eac3e6b4ea11 100644
> --- a/drivers/platform/x86/huawei-wmi.c
> +++ b/drivers/platform/x86/huawei-wmi.c
> @@ -470,10 +470,17 @@ static DEVICE_ATTR_RW(charge_control_thresholds);
>  
>  static int huawei_wmi_battery_add(struct power_supply *battery)
>  {
> -	device_create_file(&battery->dev, &dev_attr_charge_control_start_threshold);
> -	device_create_file(&battery->dev, &dev_attr_charge_control_end_threshold);
> +	int err = 0;
>  
> -	return 0;
> +	err = device_create_file(&battery->dev, &dev_attr_charge_control_start_threshold);
> +	if (err)
> +		return err;
> +
> +	err = device_create_file(&battery->dev, &dev_attr_charge_control_end_threshold);
> +	if (err)
> +		device_remove_file(&battery->dev, &dev_attr_charge_control_start_threshold);
> +
> +	return err;
>  }
>  
>  static int huawei_wmi_battery_remove(struct power_supply *battery)