linux-kernel - Re: [PATCH RESEND] drm/nouveau/hwmon: Use sysfs

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Date:   Mon, 06 Mar 2023 19:20:05 -0500
From:   Lyude Paul <lyude@...hat.com>
To:     Deepak R Varma <drv@...lo.com>, Ben Skeggs <bskeggs@...hat.com>,
        Karol Herbst <kherbst@...hat.com>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        dri-devel@...ts.freedesktop.org, nouveau@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Cc:     Saurabh Singh Sengar <ssengar@...rosoft.com>,
        Praveen Kumar <kumarpraveen@...ux.microsoft.com>
Subject: Re: [PATCH RESEND] drm/nouveau/hwmon: Use sysfs_emit in show
 function callsbacks

Reviewed-by: Lyude Paul <lyude@...hat.com>

Will push upstream in a moment

On Thu, 2023-03-02 at 01:05 +0530, Deepak R Varma wrote:
> According to Documentation/filesystems/sysfs.rst, the show() callback
> function of kobject attributes should strictly use sysfs_emit() instead
> of sprintf() family functions. So, make this change.
> Issue identified using the coccinelle device_attr_show.cocci script.
> 
> Signed-off-by: Deepak R Varma <drv@...lo.com>
> ---
> Note:
>    Resending the patch for review and feedback. No functional changes.
> 
> 
>  drivers/gpu/drm/nouveau/nouveau_hwmon.c | 10 +++++-----
>  1 file changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/gpu/drm/nouveau/nouveau_hwmon.c b/drivers/gpu/drm/nouveau/nouveau_hwmon.c
> index a7db7c31064b..e844be49e11e 100644
> --- a/drivers/gpu/drm/nouveau/nouveau_hwmon.c
> +++ b/drivers/gpu/drm/nouveau/nouveau_hwmon.c
> @@ -41,7 +41,7 @@ static ssize_t
>  nouveau_hwmon_show_temp1_auto_point1_pwm(struct device *d,
>  					 struct device_attribute *a, char *buf)
>  {
> -	return snprintf(buf, PAGE_SIZE, "%d\n", 100);
> +	return sysfs_emit(buf, "%d\n", 100);
>  }
>  static SENSOR_DEVICE_ATTR(temp1_auto_point1_pwm, 0444,
>  			  nouveau_hwmon_show_temp1_auto_point1_pwm, NULL, 0);
> @@ -54,8 +54,8 @@ nouveau_hwmon_temp1_auto_point1_temp(struct device *d,
>  	struct nouveau_drm *drm = nouveau_drm(dev);
>  	struct nvkm_therm *therm = nvxx_therm(&drm->client.device);
>  
> -	return snprintf(buf, PAGE_SIZE, "%d\n",
> -	      therm->attr_get(therm, NVKM_THERM_ATTR_THRS_FAN_BOOST) * 1000);
> +	return sysfs_emit(buf, "%d\n",
> +			  therm->attr_get(therm, NVKM_THERM_ATTR_THRS_FAN_BOOST) * 1000);
>  }
>  static ssize_t
>  nouveau_hwmon_set_temp1_auto_point1_temp(struct device *d,
> @@ -87,8 +87,8 @@ nouveau_hwmon_temp1_auto_point1_temp_hyst(struct device *d,
>  	struct nouveau_drm *drm = nouveau_drm(dev);
>  	struct nvkm_therm *therm = nvxx_therm(&drm->client.device);
>  
> -	return snprintf(buf, PAGE_SIZE, "%d\n",
> -	 therm->attr_get(therm, NVKM_THERM_ATTR_THRS_FAN_BOOST_HYST) * 1000);
> +	return sysfs_emit(buf, "%d\n",
> +			  therm->attr_get(therm, NVKM_THERM_ATTR_THRS_FAN_BOOST_HYST) * 1000);
>  }
>  static ssize_t
>  nouveau_hwmon_set_temp1_auto_point1_temp_hyst(struct device *d,

-- 
Cheers,
 Lyude Paul (she/her)
 Software Engineer at Red Hat