linux-kernel - Re: [PATCH 1/2] dmi-id: don't free dev structure after calling device

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Date:	Mon, 18 Jul 2016 19:09:30 +0200
From:	Jean Delvare <jdelvare@...e.de>
To:	Allen Hung <allen_hung@...l.com>
Cc:	linux-kernel@...r.kernel.org,
	Mario Limonciello <mario_limonciello@...l.com>
Subject: Re: [PATCH 1/2] dmi-id: don't free dev structure after calling
 device_register

On Thu, 14 Jul 2016 16:01:22 +0800, Allen Hung wrote:
> dmi_dev is freed in error exit code but, according to the document
> of device_register, it should never directly free device structure
> after calling this function, even if it returned an error! Use
> put_device() instead.
> 
> Signed-off-by: Allen Hung <allen_hung@...l.com>
> ---
>  drivers/firmware/dmi-id.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/firmware/dmi-id.c b/drivers/firmware/dmi-id.c
> index 94a58a0..44c0139 100644
> --- a/drivers/firmware/dmi-id.c
> +++ b/drivers/firmware/dmi-id.c
> @@ -229,14 +229,14 @@ static int __init dmi_id_init(void)
>  
>  	ret = device_register(dmi_dev);
>  	if (ret)
> -		goto fail_free_dmi_dev;
> +		goto fail_put_dmi_dev;
>  
>  	return 0;
>  
> -fail_free_dmi_dev:
> -	kfree(dmi_dev);
> -fail_class_unregister:
> +fail_put_dmi_dev:
> +	put_device(dmi_dev);
>  
> +fail_class_unregister:
>  	class_unregister(&dmi_class);
>  
>  	return ret;

Good catch. Applied, thanks.

-- 
Jean Delvare
SUSE L3 Support