[PATCH] platform/chrome: cros_ec_lightbar: replace sscanf with kstrtouint

[PATCH] platform/chrome: cros_ec_lightbar: replace sscanf with kstrtouint

[trunix-creator]

Replace the use of sscanf() with kstrtouint(), which is the favored kernel
API for parsing integers from strings. This avoids format string parsing
overhead and improves robustness.

Signed-off-by: trunix-creator <trunixcodes@zohomail.com>
---
 drivers/platform/chrome/cros_ec_lightbar.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/platform/chrome/cros_ec_lightbar.c b/drivers/platform/chrome/cros_ec_lightbar.c
index 922758c2cec1..e455ff440b11 100644
--- a/drivers/platform/chrome/cros_ec_lightbar.c
+++ b/drivers/platform/chrome/cros_ec_lightbar.c
@@ -243,10 +243,10 @@ static ssize_t led_rgb_store(struct device *dev, struct device_attribute *attr,
 		if (!*buf)
 			break;
 
-		ret = sscanf(buf, "%i", &val[i++]);
+		ret = kstrtouint(buf, 0, &val[i]);
 		if (ret == 0)
 			goto exit;
-
+		i++;
 		if (i == 4) {
 			param = (struct ec_params_lightbar *)msg->data;
 			param->cmd = LIGHTBAR_CMD_SET_RGB;
-- 
2.43.0

Re: [PATCH] platform/chrome: cros_ec_lightbar: replace sscanf with kstrtouint

[Tzung-Bi Shih]

On Sun, Feb 08, 2026 at 02:13:35PM -0800, trunix-creator wrote:
> Replace the use of sscanf() with kstrtouint(), which is the favored kernel
> API for parsing integers from strings. This avoids format string parsing
> overhead and improves robustness.
> 
> Signed-off-by: trunix-creator <trunixcodes@zohomail.com>

Thanks for the patch.

Before this can be considered for merging, you'll need to update the
Signed-off-by line.  The kernel community requires the use of your real
name (legal name) rather than a handle (see also "Developer's Certificate
of Origin" in Documentation/process/submitting-patches.rst).

> @@ -243,10 +243,10 @@ static ssize_t led_rgb_store(struct device *dev, struct device_attribute *attr,
>  		if (!*buf)
>  			break;
>  
> -		ret = sscanf(buf, "%i", &val[i++]);
> +		ret = kstrtouint(buf, 0, &val[i]);
>  		if (ret == 0)
>  			goto exit;

This is incorrect.  `sscanf` returns the number of items matched (e.g., 1 on
success in the case).  `kstrtouint` returns 0 on success.

> -
> +		i++;

Why it moves the increment to here?  It seems unrelated to the patch.