linux-kernel - Re: [PATCH v2 1/4] HID: hid-picolcd_core: Convert sprintf/snprintf to sysfs

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Date: Thu, 14 Mar 2024 10:39:12 +0000
From: "Zhijian Li (Fujitsu)" <lizhijian@...itsu.com>
To: Bruno Prémont <bonbons@...ux-vserver.org>
CC: Jiri Kosina <jikos@...nel.org>, Benjamin Tissoires
	<benjamin.tissoires@...hat.com>, "linux-input@...r.kernel.org"
	<linux-input@...r.kernel.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/4] HID: hid-picolcd_core: Convert sprintf/snprintf to
 sysfs_emit


Sorry Bruno, i forgot to address your comments for V1, I will re-send a new version later.
Please ignore this one.

Thanks
Zhijian


On 14/03/2024 16:47, Li Zhijian 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() will be converted as weel 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: "Bruno Prémont" <bonbons@...ux-vserver.org>
> CC: Jiri Kosina <jikos@...nel.org>
> CC: Benjamin Tissoires <benjamin.tissoires@...hat.com>
> CC: linux-input@...r.kernel.org
> Signed-off-by: Li Zhijian <lizhijian@...itsu.com>
> ---
> 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-picolcd_core.c | 6 +++---
>   1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/hid/hid-picolcd_core.c b/drivers/hid/hid-picolcd_core.c
> index bbda231a7ce3..fa46fb6eab3f 100644
> --- a/drivers/hid/hid-picolcd_core.c
> +++ b/drivers/hid/hid-picolcd_core.c
> @@ -256,9 +256,9 @@ static ssize_t picolcd_operation_mode_show(struct device *dev,
>   	struct picolcd_data *data = dev_get_drvdata(dev);
>   
>   	if (data->status & PICOLCD_BOOTLOADER)
> -		return snprintf(buf, PAGE_SIZE, "[bootloader] lcd\n");
> +		return sysfs_emit(buf, "[bootloader] lcd\n");
>   	else
> -		return snprintf(buf, PAGE_SIZE, "bootloader [lcd]\n");
> +		return sysfs_emit(buf, "bootloader [lcd]\n");
>   }
>   
>   static ssize_t picolcd_operation_mode_store(struct device *dev,
> @@ -301,7 +301,7 @@ static ssize_t picolcd_operation_mode_delay_show(struct device *dev,
>   {
>   	struct picolcd_data *data = dev_get_drvdata(dev);
>   
> -	return snprintf(buf, PAGE_SIZE, "%hu\n", data->opmode_delay);
> +	return sysfs_emit(buf, "%hu\n", data->opmode_delay);
>   }
>   
>   static ssize_t picolcd_operation_mode_delay_store(struct device *dev,