linux-kernel - [PATCH 2/6] hwmon: Use device_show_string() helper for sysfs attributes

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Date: Sat, 20 Apr 2024 22:00:02 +0200
From: Lukas Wunner <lukas@...ner.de>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, "Rafael J. Wysocki" <rafael@...nel.org>, linux-kernel@...r.kernel.org
Cc: Jean Delvare <jdelvare@...e.com>, Guenter Roeck <linux@...ck-us.net>, linux-hwmon@...r.kernel.org
Subject: [PATCH 2/6] hwmon: Use device_show_string() helper for sysfs
 attributes

Deduplicate sysfs ->show() callbacks which expose a string at a static
memory location.  Use the newly introduced device_show_string() helper
in the driver core instead by declaring those sysfs attributes with
DEVICE_STRING_ATTR_RO().

No functional change intended.

Signed-off-by: Lukas Wunner <lukas@...ner.de>
---
 drivers/hwmon/i5k_amb.c | 15 ++++-----------
 drivers/hwmon/ibmpex.c  | 14 ++++----------
 2 files changed, 8 insertions(+), 21 deletions(-)

diff --git a/drivers/hwmon/i5k_amb.c b/drivers/hwmon/i5k_amb.c
index ff48913fe6bf..02f5d35dd319 100644
--- a/drivers/hwmon/i5k_amb.c
+++ b/drivers/hwmon/i5k_amb.c
@@ -101,14 +101,7 @@ struct i5k_amb_data {
 	unsigned int num_attrs;
 };
 
-static ssize_t name_show(struct device *dev, struct device_attribute *devattr,
-			 char *buf)
-{
-	return sprintf(buf, "%s\n", DRVNAME);
-}
-
-
-static DEVICE_ATTR_RO(name);
+static DEVICE_STRING_ATTR_RO(name, 0444, DRVNAME);
 
 static struct platform_device *amb_pdev;
 
@@ -373,7 +366,7 @@ static int i5k_amb_hwmon_init(struct platform_device *pdev)
 		}
 	}
 
-	res = device_create_file(&pdev->dev, &dev_attr_name);
+	res = device_create_file(&pdev->dev, &dev_attr_name.attr);
 	if (res)
 		goto exit_remove;
 
@@ -386,7 +379,7 @@ static int i5k_amb_hwmon_init(struct platform_device *pdev)
 	return res;
 
 exit_remove:
-	device_remove_file(&pdev->dev, &dev_attr_name);
+	device_remove_file(&pdev->dev, &dev_attr_name.attr);
 	for (i = 0; i < data->num_attrs; i++)
 		device_remove_file(&pdev->dev, &data->attrs[i].s_attr.dev_attr);
 	kfree(data->attrs);
@@ -561,7 +554,7 @@ static void i5k_amb_remove(struct platform_device *pdev)
 	struct i5k_amb_data *data = platform_get_drvdata(pdev);
 
 	hwmon_device_unregister(data->hwmon_dev);
-	device_remove_file(&pdev->dev, &dev_attr_name);
+	device_remove_file(&pdev->dev, &dev_attr_name.attr);
 	for (i = 0; i < data->num_attrs; i++)
 		device_remove_file(&pdev->dev, &data->attrs[i].s_attr.dev_attr);
 	kfree(data->attrs);
diff --git a/drivers/hwmon/ibmpex.c b/drivers/hwmon/ibmpex.c
index db066b368918..228c5f6c6f38 100644
--- a/drivers/hwmon/ibmpex.c
+++ b/drivers/hwmon/ibmpex.c
@@ -256,12 +256,7 @@ static struct ibmpex_bmc_data *get_bmc_data(int iface)
 	return NULL;
 }
 
-static ssize_t name_show(struct device *dev, struct device_attribute *devattr,
-			 char *buf)
-{
-	return sprintf(buf, "%s\n", DRVNAME);
-}
-static SENSOR_DEVICE_ATTR_RO(name, name, 0);
+static DEVICE_STRING_ATTR_RO(name, 0444, DRVNAME);
 
 static ssize_t ibmpex_show_sensor(struct device *dev,
 				  struct device_attribute *devattr,
@@ -415,8 +410,7 @@ static int ibmpex_find_sensors(struct ibmpex_bmc_data *data)
 	if (err)
 		goto exit_remove;
 
-	err = device_create_file(data->bmc_device,
-			&sensor_dev_attr_name.dev_attr);
+	err = device_create_file(data->bmc_device, &dev_attr_name.attr);
 	if (err)
 		goto exit_remove;
 
@@ -425,7 +419,7 @@ static int ibmpex_find_sensors(struct ibmpex_bmc_data *data)
 exit_remove:
 	device_remove_file(data->bmc_device,
 			   &sensor_dev_attr_reset_high_low.dev_attr);
-	device_remove_file(data->bmc_device, &sensor_dev_attr_name.dev_attr);
+	device_remove_file(data->bmc_device, &dev_attr_name.attr);
 	for (i = 0; i < data->num_sensors; i++)
 		for (j = 0; j < PEX_NUM_SENSOR_FUNCS; j++) {
 			if (!data->sensors[i].attr[j].dev_attr.attr.name)
@@ -516,7 +510,7 @@ static void ibmpex_bmc_delete(struct ibmpex_bmc_data *data)
 
 	device_remove_file(data->bmc_device,
 			   &sensor_dev_attr_reset_high_low.dev_attr);
-	device_remove_file(data->bmc_device, &sensor_dev_attr_name.dev_attr);
+	device_remove_file(data->bmc_device, &dev_attr_name.attr);
 	for (i = 0; i < data->num_sensors; i++)
 		for (j = 0; j < PEX_NUM_SENSOR_FUNCS; j++) {
 			if (!data->sensors[i].attr[j].dev_attr.attr.name)
-- 
2.43.0