linux-kernel - [PATCH 2/4] power: supply: ds2780: constify 'struct bin

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Message-Id: <20241202-sysfs-const-bin_attr-psy-v1-2-f846430b8b66@weissschuh.net>
Date: Mon, 02 Dec 2024 20:02:20 +0100
From: Thomas Weißschuh <linux@...ssschuh.net>
To: Sebastian Reichel <sre@...nel.org>
Cc: linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Thomas Weißschuh <linux@...ssschuh.net>
Subject: [PATCH 2/4] power: supply: ds2780: constify 'struct bin_attribute'

The sysfs core now allows instances of 'struct bin_attribute' to be
moved into read-only memory. Make use of that to protect them against
accidental or malicious modifications.

Signed-off-by: Thomas Weißschuh <linux@...ssschuh.net>
---
 drivers/power/supply/ds2780_battery.c | 24 ++++++++++++------------
 1 file changed, 12 insertions(+), 12 deletions(-)

diff --git a/drivers/power/supply/ds2780_battery.c b/drivers/power/supply/ds2780_battery.c
index 1e7f297f6cb181e6ab7dc8e47b638aa43db8db97..dd9ac7a3296716d8ab72db56c1d9c0e439c3b2a9 100644
--- a/drivers/power/supply/ds2780_battery.c
+++ b/drivers/power/supply/ds2780_battery.c
@@ -621,7 +621,7 @@ static ssize_t ds2780_set_pio_pin(struct device *dev,
 
 static ssize_t ds2780_read_param_eeprom_bin(struct file *filp,
 				struct kobject *kobj,
-				struct bin_attribute *bin_attr,
+				const struct bin_attribute *bin_attr,
 				char *buf, loff_t off, size_t count)
 {
 	struct device *dev = kobj_to_dev(kobj);
@@ -634,7 +634,7 @@ static ssize_t ds2780_read_param_eeprom_bin(struct file *filp,
 
 static ssize_t ds2780_write_param_eeprom_bin(struct file *filp,
 				struct kobject *kobj,
-				struct bin_attribute *bin_attr,
+				const struct bin_attribute *bin_attr,
 				char *buf, loff_t off, size_t count)
 {
 	struct device *dev = kobj_to_dev(kobj);
@@ -654,19 +654,19 @@ static ssize_t ds2780_write_param_eeprom_bin(struct file *filp,
 	return count;
 }
 
-static struct bin_attribute ds2780_param_eeprom_bin_attr = {
+static const struct bin_attribute ds2780_param_eeprom_bin_attr = {
 	.attr = {
 		.name = "param_eeprom",
 		.mode = S_IRUGO | S_IWUSR,
 	},
 	.size = DS2780_PARAM_EEPROM_SIZE,
-	.read = ds2780_read_param_eeprom_bin,
-	.write = ds2780_write_param_eeprom_bin,
+	.read_new = ds2780_read_param_eeprom_bin,
+	.write_new = ds2780_write_param_eeprom_bin,
 };
 
 static ssize_t ds2780_read_user_eeprom_bin(struct file *filp,
 				struct kobject *kobj,
-				struct bin_attribute *bin_attr,
+				const struct bin_attribute *bin_attr,
 				char *buf, loff_t off, size_t count)
 {
 	struct device *dev = kobj_to_dev(kobj);
@@ -679,7 +679,7 @@ static ssize_t ds2780_read_user_eeprom_bin(struct file *filp,
 
 static ssize_t ds2780_write_user_eeprom_bin(struct file *filp,
 				struct kobject *kobj,
-				struct bin_attribute *bin_attr,
+				const struct bin_attribute *bin_attr,
 				char *buf, loff_t off, size_t count)
 {
 	struct device *dev = kobj_to_dev(kobj);
@@ -699,14 +699,14 @@ static ssize_t ds2780_write_user_eeprom_bin(struct file *filp,
 	return count;
 }
 
-static struct bin_attribute ds2780_user_eeprom_bin_attr = {
+static const struct bin_attribute ds2780_user_eeprom_bin_attr = {
 	.attr = {
 		.name = "user_eeprom",
 		.mode = S_IRUGO | S_IWUSR,
 	},
 	.size = DS2780_USER_EEPROM_SIZE,
-	.read = ds2780_read_user_eeprom_bin,
-	.write = ds2780_write_user_eeprom_bin,
+	.read_new = ds2780_read_user_eeprom_bin,
+	.write_new = ds2780_write_user_eeprom_bin,
 };
 
 static DEVICE_ATTR(pmod_enabled, S_IRUGO | S_IWUSR, ds2780_get_pmod_enabled,
@@ -726,7 +726,7 @@ static struct attribute *ds2780_sysfs_attrs[] = {
 	NULL
 };
 
-static struct bin_attribute *ds2780_sysfs_bin_attrs[] = {
+static const struct bin_attribute *const ds2780_sysfs_bin_attrs[] = {
 	&ds2780_param_eeprom_bin_attr,
 	&ds2780_user_eeprom_bin_attr,
 	NULL
@@ -734,7 +734,7 @@ static struct bin_attribute *ds2780_sysfs_bin_attrs[] = {
 
 static const struct attribute_group ds2780_sysfs_group = {
 	.attrs = ds2780_sysfs_attrs,
-	.bin_attrs = ds2780_sysfs_bin_attrs,
+	.bin_attrs_new = ds2780_sysfs_bin_attrs,
 };
 
 static const struct attribute_group *ds2780_sysfs_groups[] = {

-- 
2.47.1