linux-kernel - Re: [PATCH] Input: elan_i2c

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Date:   Fri, 29 Jul 2022 11:43:03 -0700
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-input@...r.kernel.org, Hans de Goede <hdegoede@...hat.com>,
        "jingle.wu" <jingle.wu@....com.tw>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Input: elan_i2c - convert to use dev_groups

Hi Greg,

On Fri, Jul 29, 2022 at 03:58:16PM +0200, Greg Kroah-Hartman wrote:
> The driver core supports the ability to handle the creation and removal
> of device-specific sysfs files in a race-free manner.  Take advantage of
> that by converting this driver to use this by moving the sysfs
> attributes into a group and assigning the dev_groups pointer to it.

I obviously like this patch as the less boilerplate code the better, but
I am not sure what race are you talking about in the commit message?
Could you please elaborate?

Thanks!

> 
> Cc: Dmitry Torokhov <dmitry.torokhov@...il.com>
> Cc: Hans de Goede <hdegoede@...hat.com>
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Cc: "jingle.wu" <jingle.wu@....com.tw>
> Cc: linux-input@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> ---
>  drivers/input/mouse/elan_i2c_core.c | 7 +------
>  1 file changed, 1 insertion(+), 6 deletions(-)
> 
> diff --git a/drivers/input/mouse/elan_i2c_core.c b/drivers/input/mouse/elan_i2c_core.c
> index e1758d5ffe42..d4eb59b55bf1 100644
> --- a/drivers/input/mouse/elan_i2c_core.c
> +++ b/drivers/input/mouse/elan_i2c_core.c
> @@ -1311,12 +1311,6 @@ static int elan_probe(struct i2c_client *client,
>  		return error;
>  	}
>  
> -	error = devm_device_add_groups(dev, elan_sysfs_groups);
> -	if (error) {
> -		dev_err(dev, "failed to create sysfs attributes: %d\n", error);
> -		return error;
> -	}
> -
>  	error = input_register_device(data->input);
>  	if (error) {
>  		dev_err(dev, "failed to register input device: %d\n", error);
> @@ -1442,6 +1436,7 @@ static struct i2c_driver elan_driver = {
>  		.acpi_match_table = ACPI_PTR(elan_acpi_id),
>  		.of_match_table = of_match_ptr(elan_of_match),
>  		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
> +		.dev_groups = elan_sysfs_groups,
>  	},
>  	.probe		= elan_probe,
>  	.id_table	= elan_id,
> -- 
> 2.37.1
> 

-- 
Dmitry