linux-kernel - Re: [PATCH v4 2/4] HID: hid-sensor-custom: Convert sprintf() family to sysfs

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Date: Sun, 24 Mar 2024 12:16:08 +0000
From: Jonathan Cameron <jic23@...nel.org>
To: Li Zhijian <lizhijian@...itsu.com>
Cc: linux-kernel@...r.kernel.org, Jiri Kosina <jikos@...nel.org>, Srinivas
 Pandruvada <srinivas.pandruvada@...ux.intel.com>, Benjamin Tissoires
 <benjamin.tissoires@...hat.com>, linux-input@...r.kernel.org,
 linux-iio@...r.kernel.org, Jonathan Cameron <Jonathan.Cameron@...wei.com>
Subject: Re: [PATCH v4 2/4] HID: hid-sensor-custom: Convert sprintf() family
 to sysfs_emit() family

On Tue, 19 Mar 2024 13:45:25 +0800
Li Zhijian <lizhijian@...itsu.com> wrote:

> Per filesystems/sysfs.rst, show() should only use sysfs_emit()
> or sysfs_emit_at() when formatting the value to be returned to user space.
> 
> coccinelle complains that there are still a couple of functions that use
> snprintf(). Convert them to sysfs_emit().
> 
> sprintf() and scnprintf() will be converted as well if they have.
> 
> Generally, this patch is generated by
> make coccicheck M=<path/to/file> MODE=patch \
> COCCI=scripts/coccinelle/api/device_attr_show.cocci
> 
> No functional change intended
> 
> CC: Jiri Kosina <jikos@...nel.org>
> CC: Jonathan Cameron <jic23@...nel.org>
> CC: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
> CC: Benjamin Tissoires <benjamin.tissoires@...hat.com>
> CC: linux-input@...r.kernel.org
> CC: linux-iio@...r.kernel.org

As a general rule, don't have cc's of lists up here. It makes
a mess of the logs. Also once you have another tag drop CC of
same person (even if it's a different email address).

We don't want to fill the git log with useless information.

I think git is fine picking up CC's from below the --- so you
can add them there if it simplifies how you send your patch
sets out.


> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
> Signed-off-by: Li Zhijian <lizhijian@...itsu.com>
> ---
> V3:
>    rewrap the line as will be under 80 chars and add Reviewed-by # Jonathan
> This is a part of the work "Fix coccicheck device_attr_show warnings"[1]
> Split them per subsystem so that the maintainer can review it easily
> [1] https://lore.kernel.org/lkml/20240116041129.3937800-1-lizhijian@fujitsu.com/
> ---
>  drivers/hid/hid-sensor-custom.c | 9 ++++-----
>  1 file changed, 4 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/hid/hid-sensor-custom.c b/drivers/hid/hid-sensor-custom.c
> index d85398721659..ac214777d7d9 100644
> --- a/drivers/hid/hid-sensor-custom.c
> +++ b/drivers/hid/hid-sensor-custom.c
> @@ -155,7 +155,7 @@ static ssize_t enable_sensor_show(struct device *dev,
>  {
>  	struct hid_sensor_custom *sensor_inst = dev_get_drvdata(dev);
>  
> -	return sprintf(buf, "%d\n", sensor_inst->enable);
> +	return sysfs_emit(buf, "%d\n", sensor_inst->enable);
>  }
>  
>  static int set_power_report_state(struct hid_sensor_custom *sensor_inst,
> @@ -372,14 +372,13 @@ static ssize_t show_value(struct device *dev, struct device_attribute *attr,
>  				     sizeof(struct hid_custom_usage_desc),
>  				     usage_id_cmp);
>  		if (usage_desc)
> -			return snprintf(buf, PAGE_SIZE, "%s\n",
> -					usage_desc->desc);
> +			return sysfs_emit(buf, "%s\n", usage_desc->desc);
>  		else
> -			return sprintf(buf, "not-specified\n");
> +			return sysfs_emit(buf, "not-specified\n");
>  	 } else
>  		return -EINVAL;
>  
> -	return sprintf(buf, "%d\n", value);
> +	return sysfs_emit(buf, "%d\n", value);
>  }
>  
>  static ssize_t store_value(struct device *dev, struct device_attribute *attr,