linux-kernel - Re: [PATCH v2] platform/x86: samsung-laptop: Use sysfs_emit() to replace the old interface sprintf()

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Date: Mon, 22 Apr 2024 15:42:12 +0200
From: Hans de Goede <hdegoede@...hat.com>
To: yunshui <jiangyunshui@...inos.cn>, linux-kernel@...r.kernel.org,
 platform-driver-x86@...r.kernel.org
Cc: Ai Chao <aichao@...inos.cn>
Subject: Re: [PATCH v2] platform/x86: samsung-laptop: Use sysfs_emit() to
 replace the old interface sprintf()

Hi,

On 4/19/24 8:41 AM, yunshui wrote:
>     As Documentation/filesystems/sysfs.rst suggested,
>     show() should only use sysfs_emit() or sysfs_emit_at() when formatting
>     the value to be returned to user space.
> 
> Signed-off-by: yunshui <jiangyunshui@...inos.cn>
> Reviewed-by: Ai Chao <aichao@...inos.cn>

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/samsung-laptop.c | 10 +++++-----
>  1 file changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/platform/x86/samsung-laptop.c b/drivers/platform/x86/samsung-laptop.c
> index b4aa8ba35d2d..3d2f8e758369 100644
> --- a/drivers/platform/x86/samsung-laptop.c
> +++ b/drivers/platform/x86/samsung-laptop.c
> @@ -661,9 +661,9 @@ static ssize_t get_performance_level(struct device *dev,
>  	/* The logic is backwards, yeah, lots of fun... */
>  	for (i = 0; config->performance_levels[i].name; ++i) {
>  		if (sretval.data[0] == config->performance_levels[i].value)
> -			return sprintf(buf, "%s\n", config->performance_levels[i].name);
> +			return sysfs_emit(buf, "%s\n", config->performance_levels[i].name);
>  	}
> -	return sprintf(buf, "%s\n", "unknown");
> +	return sysfs_emit(buf, "%s\n", "unknown");
>  }
>  
>  static ssize_t set_performance_level(struct device *dev,
> @@ -744,7 +744,7 @@ static ssize_t get_battery_life_extender(struct device *dev,
>  	if (ret < 0)
>  		return ret;
>  
> -	return sprintf(buf, "%d\n", ret);
> +	return sysfs_emit(buf, "%d\n", ret);
>  }
>  
>  static ssize_t set_battery_life_extender(struct device *dev,
> @@ -813,7 +813,7 @@ static ssize_t get_usb_charge(struct device *dev,
>  	if (ret < 0)
>  		return ret;
>  
> -	return sprintf(buf, "%d\n", ret);
> +	return sysfs_emit(buf, "%d\n", ret);
>  }
>  
>  static ssize_t set_usb_charge(struct device *dev,
> @@ -878,7 +878,7 @@ static ssize_t get_lid_handling(struct device *dev,
>  	if (ret < 0)
>  		return ret;
>  
> -	return sprintf(buf, "%d\n", ret);
> +	return sysfs_emit(buf, "%d\n", ret);
>  }
>  
>  static ssize_t set_lid_handling(struct device *dev,