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/video/backlight/lm3533_bl.c | 10 +++++-----
 drivers/video/backlight/lp855x_bl.c |  4 ++--
 drivers/video/backlight/lp8788_bl.c |  2 +-
 3 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/drivers/video/backlight/lm3533_bl.c b/drivers/video/backlight/lm3533_bl.c
index 1df1b6643c0b..5e2ce9285245 100644
--- a/drivers/video/backlight/lm3533_bl.c
+++ b/drivers/video/backlight/lm3533_bl.c
@@ -66,7 +66,7 @@ static ssize_t show_id(struct device *dev,
 {
 	struct lm3533_bl *bl = dev_get_drvdata(dev);

-	return scnprintf(buf, PAGE_SIZE, "%d\n", bl->id);
+	return sysfs_emit(buf, "%d\n", bl->id);
 }

 static ssize_t show_als_channel(struct device *dev,
@@ -75,7 +75,7 @@ static ssize_t show_als_channel(struct device *dev,
 	struct lm3533_bl *bl = dev_get_drvdata(dev);
 	unsigned channel = lm3533_bl_get_ctrlbank_id(bl);

-	return scnprintf(buf, PAGE_SIZE, "%u\n", channel);
+	return sysfs_emit(buf, "%u\n", channel);
 }

 static ssize_t show_als_en(struct device *dev,
@@ -95,7 +95,7 @@ static ssize_t show_als_en(struct device *dev,
 	mask = 1 << (2 * ctrlbank);
 	enable = val & mask;

-	return scnprintf(buf, PAGE_SIZE, "%d\n", enable);
+	return sysfs_emit(buf, "%d\n", enable);
 }

 static ssize_t store_als_en(struct device *dev,
@@ -147,7 +147,7 @@ static ssize_t show_linear(struct device *dev,
 	else
 		linear = 0;

-	return scnprintf(buf, PAGE_SIZE, "%x\n", linear);
+	return sysfs_emit(buf, "%x\n", linear);
 }

 static ssize_t store_linear(struct device *dev,
@@ -190,7 +190,7 @@ static ssize_t show_pwm(struct device *dev,
 	if (ret)
 		return ret;

-	return scnprintf(buf, PAGE_SIZE, "%u\n", val);
+	return sysfs_emit(buf, "%u\n", val);
 }

 static ssize_t store_pwm(struct device *dev,
diff --git a/drivers/video/backlight/lp855x_bl.c b/drivers/video/backlight/lp855x_bl.c
index bd0bdeae23a4..fafc1a9e76ef 100644
--- a/drivers/video/backlight/lp855x_bl.c
+++ b/drivers/video/backlight/lp855x_bl.c
@@ -293,7 +293,7 @@ static ssize_t lp855x_get_chip_id(struct device *dev,
 {
 	struct lp855x *lp = dev_get_drvdata(dev);

-	return scnprintf(buf, PAGE_SIZE, "%s\n", lp->chipname);
+	return sysfs_emit(buf, "%s\n", lp->chipname);
 }

 static ssize_t lp855x_get_bl_ctl_mode(struct device *dev,
@@ -307,7 +307,7 @@ static ssize_t lp855x_get_bl_ctl_mode(struct device *dev,
 	else if (lp->mode == REGISTER_BASED)
 		strmode = "register based";

-	return scnprintf(buf, PAGE_SIZE, "%s\n", strmode);
+	return sysfs_emit(buf, "%s\n", strmode);
 }

 static DEVICE_ATTR(chip_id, S_IRUGO, lp855x_get_chip_id, NULL);
diff --git a/drivers/video/backlight/lp8788_bl.c b/drivers/video/backlight/lp8788_bl.c
index ba42f3fe0c73..00d79c0cfee9 100644
--- a/drivers/video/backlight/lp8788_bl.c
+++ b/drivers/video/backlight/lp8788_bl.c
@@ -240,7 +240,7 @@ static ssize_t lp8788_get_bl_ctl_mode(struct device *dev,
 	else
 		strmode = "Invalid mode";

-	return scnprintf(buf, PAGE_SIZE, "%s\n", strmode);
+	return sysfs_emit(buf, "%s\n", strmode);
 }

 static DEVICE_ATTR(bl_ctl_mode, S_IRUGO, lp8788_get_bl_ctl_mode, NULL);
-- 
2.25.1

On Mon, 05 Dec 2022, 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/video/backlight/lm3533_bl.c | 10 +++++-----
>  drivers/video/backlight/lp855x_bl.c |  4 ++--
>  drivers/video/backlight/lp8788_bl.c |  2 +-
>  3 files changed, 8 insertions(+), 8 deletions(-)

Is this v3?

-- 
Lee Jones [李琼斯]

On Mon, Dec 05, 2022 at 03:56:47PM +0800, ye.xingchen@zte.com.cn wrote:
> Subject: [PATCH linux-next] backlight: use sysfs_emit() to instead of
> scnprintf()

Isn't this a v2?

(this isn't just a "nice to have"... I ended up delaying review for
several days until I had time to look up where I had seen these changes
before)


> 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>

Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>


Daniel.