[PATCH] ACPI: fan: Convert to use sysfs_emit_at() API

[PATCH] ACPI: fan: Convert to use sysfs_emit_at() API

[ye.xingchen]

From: ye xingchen <ye.xingchen@zte.com.cn>

Follow the advice of the Documentation/filesystems/sysfs.rst and show()
should only use sysfs_emit() or sysfs_emit_at() when formatting the
value to be returned to user space.

Signed-off-by: ye xingchen <ye.xingchen@zte.com.cn>
---
 drivers/acpi/fan_attr.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/drivers/acpi/fan_attr.c b/drivers/acpi/fan_attr.c
index f15157d40713..f4f6e2381f1d 100644
--- a/drivers/acpi/fan_attr.c
+++ b/drivers/acpi/fan_attr.c
@@ -27,24 +27,24 @@ static ssize_t show_state(struct device *dev, struct device_attribute *attr, cha
 		count = scnprintf(buf, PAGE_SIZE, "%lld:", fps->control);

 	if (fps->trip_point == 0xFFFFFFFF || fps->trip_point > 9)
-		count += scnprintf(&buf[count], PAGE_SIZE - count, "not-defined:");
+		count += sysfs_emit_at(buf, count, "not-defined:");
 	else
-		count += scnprintf(&buf[count], PAGE_SIZE - count, "%lld:", fps->trip_point);
+		count += sysfs_emit_at(buf, count, "%lld:", fps->trip_point);

 	if (fps->speed == 0xFFFFFFFF)
-		count += scnprintf(&buf[count], PAGE_SIZE - count, "not-defined:");
+		count += sysfs_emit_at(buf, count, "not-defined:");
 	else
-		count += scnprintf(&buf[count], PAGE_SIZE - count, "%lld:", fps->speed);
+		count += sysfs_emit_at(buf, count, "%lld:", fps->speed);

 	if (fps->noise_level == 0xFFFFFFFF)
-		count += scnprintf(&buf[count], PAGE_SIZE - count, "not-defined:");
+		count += sysfs_emit_at(buf, count, "not-defined:");
 	else
-		count += scnprintf(&buf[count], PAGE_SIZE - count, "%lld:", fps->noise_level * 100);
+		count += sysfs_emit_at(buf, count, "%lld:", fps->noise_level * 100);

 	if (fps->power == 0xFFFFFFFF)
-		count += scnprintf(&buf[count], PAGE_SIZE - count, "not-defined\n");
+		count += sysfs_emit_at(buf, count, "not-defined\n");
 	else
-		count += scnprintf(&buf[count], PAGE_SIZE - count, "%lld\n", fps->power);
+		count += sysfs_emit_at(buf, count, "%lld\n", fps->power);

 	return count;
 }
-- 
2.25.1

Re: [PATCH] ACPI: fan: Convert to use sysfs_emit_at() API

[Rafael J. Wysocki]

On Tue, Dec 6, 2022 at 8:19 AM <ye.xingchen@zte.com.cn> wrote:
>
> From: ye xingchen <ye.xingchen@zte.com.cn>
>
> Follow the advice of the Documentation/filesystems/sysfs.rst and show()
> should only use sysfs_emit() or sysfs_emit_at() when formatting the
> value to be returned to user space.
>
> Signed-off-by: ye xingchen <ye.xingchen@zte.com.cn>
> ---
>  drivers/acpi/fan_attr.c | 16 ++++++++--------
>  1 file changed, 8 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/acpi/fan_attr.c b/drivers/acpi/fan_attr.c
> index f15157d40713..f4f6e2381f1d 100644
> --- a/drivers/acpi/fan_attr.c
> +++ b/drivers/acpi/fan_attr.c
> @@ -27,24 +27,24 @@ static ssize_t show_state(struct device *dev, struct device_attribute *attr, cha
>                 count = scnprintf(buf, PAGE_SIZE, "%lld:", fps->control);
>
>         if (fps->trip_point == 0xFFFFFFFF || fps->trip_point > 9)
> -               count += scnprintf(&buf[count], PAGE_SIZE - count, "not-defined:");
> +               count += sysfs_emit_at(buf, count, "not-defined:");
>         else
> -               count += scnprintf(&buf[count], PAGE_SIZE - count, "%lld:", fps->trip_point);
> +               count += sysfs_emit_at(buf, count, "%lld:", fps->trip_point);
>
>         if (fps->speed == 0xFFFFFFFF)
> -               count += scnprintf(&buf[count], PAGE_SIZE - count, "not-defined:");
> +               count += sysfs_emit_at(buf, count, "not-defined:");
>         else
> -               count += scnprintf(&buf[count], PAGE_SIZE - count, "%lld:", fps->speed);
> +               count += sysfs_emit_at(buf, count, "%lld:", fps->speed);
>
>         if (fps->noise_level == 0xFFFFFFFF)
> -               count += scnprintf(&buf[count], PAGE_SIZE - count, "not-defined:");
> +               count += sysfs_emit_at(buf, count, "not-defined:");
>         else
> -               count += scnprintf(&buf[count], PAGE_SIZE - count, "%lld:", fps->noise_level * 100);
> +               count += sysfs_emit_at(buf, count, "%lld:", fps->noise_level * 100);
>
>         if (fps->power == 0xFFFFFFFF)
> -               count += scnprintf(&buf[count], PAGE_SIZE - count, "not-defined\n");
> +               count += sysfs_emit_at(buf, count, "not-defined\n");
>         else
> -               count += scnprintf(&buf[count], PAGE_SIZE - count, "%lld\n", fps->power);
> +               count += sysfs_emit_at(buf, count, "%lld\n", fps->power);
>
>         return count;
>  }
> --

Applied as 6.2 material, thanks!

However, if you are about to send any analogous material to me, please
defer it until 6.2-rc1 is out, because it will be unlikely to get into
6.2 anyway.