[PATCH 1/2] hwmon: tmp421: check error when loading label from dt

[PATCH 1/2] hwmon: tmp421: check error when loading label from dt

[Bruno Thomsen]

Add error checking when loading temperature channel label defined
in device tree. Handling of error from of_property_read_string()
is inspired by lm90 driver and therefor contain same error string.

Signed-off-by: Bruno Thomsen <bruno.thomsen@gmail.com>
---
 drivers/hwmon/tmp421.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/hwmon/tmp421.c b/drivers/hwmon/tmp421.c
index 9537727aad9a..1eded169e843 100644
--- a/drivers/hwmon/tmp421.c
+++ b/drivers/hwmon/tmp421.c
@@ -381,7 +381,11 @@ static int tmp421_probe_child_from_dt(struct i2c_client *client,
 		return -EINVAL;
 	}
 
-	of_property_read_string(child, "label", &data->channel[i].label);
+	err = of_property_read_string(child, "label", &data->channel[i].label);
+	if (err == -ENODATA || err == -EILSEQ) {
+		dev_err(dev, "invalid label property in %pOFn\n", child);
+		return err;
+	}
 	if (data->channel[i].label)
 		data->temp_config[i] |= HWMON_T_LABEL;
 

base-commit: 284922f4c563aa3a8558a00f2a05722133237fe8
-- 
2.51.1

[PATCH 2/2] hwmon: tmp421: remove duplicate return in switch-case

[Bruno Thomsen]

Use single read permission return in switch-case that handles
attributes in tmp421_is_visible().

Signed-off-by: Bruno Thomsen <bruno.thomsen@gmail.com>
---
 drivers/hwmon/tmp421.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/hwmon/tmp421.c b/drivers/hwmon/tmp421.c
index 1eded169e843..23ed3fbc9c99 100644
--- a/drivers/hwmon/tmp421.c
+++ b/drivers/hwmon/tmp421.c
@@ -262,7 +262,6 @@ static umode_t tmp421_is_visible(const void *data, enum hwmon_sensor_types type,
 	switch (attr) {
 	case hwmon_temp_fault:
 	case hwmon_temp_input:
-		return 0444;
 	case hwmon_temp_label:
 		return 0444;
 	case hwmon_temp_enable:
-- 
2.51.1

Re: [PATCH 1/2] hwmon: tmp421: check error when loading label from dt

[Guenter Roeck]

On Tue, Nov 11, 2025 at 03:44:05PM +0100, Bruno Thomsen wrote:
> Add error checking when loading temperature channel label defined
> in device tree. Handling of error from of_property_read_string()
> is inspired by lm90 driver and therefor contain same error string.
> 
> Signed-off-by: Bruno Thomsen <bruno.thomsen@gmail.com>

Applied.

Thanks,
Guenter

Re: [PATCH 2/2] hwmon: tmp421: remove duplicate return in switch-case

[Guenter Roeck]

On Tue, Nov 11, 2025 at 03:44:06PM +0100, Bruno Thomsen wrote:
> Use single read permission return in switch-case that handles
> attributes in tmp421_is_visible().
> 
> Signed-off-by: Bruno Thomsen <bruno.thomsen@gmail.com>

Applied.

Thanks,
Guenter