power: supply: core: mark attribute arrays as ro_after_init

The attribute arrays are only modified during the __init phase.
To protect them against intentional or accidental modification,
mark them as __ro_after_init.

To make sure no modifications are introduced, also mark the return
values of the accessors as const.

Signed-off-by: Thomas Weißschuh <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Sebastian Reichel <[e-mail]>

drivers/power/supply/power_supply.h

···
 
 #ifdef CONFIG_SYSFS
 
-extern void power_supply_init_attrs(void);
+extern void __init power_supply_init_attrs(void);
 extern int power_supply_uevent(const struct device *dev, struct kobj_uevent_env *env);
 extern const struct attribute_group *power_supply_attr_groups[];
 

drivers/power/supply/power_supply_sysfs.c

···
 	[POWER_SUPPLY_CHARGE_BEHAVIOUR_FORCE_DISCHARGE]	= "force-discharge",
 };
 
-static struct power_supply_attr power_supply_attrs[] = {
+static struct power_supply_attr power_supply_attrs[] __ro_after_init = {
 	/* Properties of type `int' */
 	POWER_SUPPLY_ENUM_ATTR(STATUS),
 	POWER_SUPPLY_ENUM_ATTR(CHARGE_TYPE),
···
 #define POWER_SUPPLY_ATTR_CNT ARRAY_SIZE(power_supply_attrs)
 
 static struct attribute *
-__power_supply_attrs[POWER_SUPPLY_ATTR_CNT + 1];
+__power_supply_attrs[POWER_SUPPLY_ATTR_CNT + 1] __ro_after_init;
 
-static struct power_supply_attr *to_ps_attr(struct device_attribute *attr)
+static const struct power_supply_attr *to_ps_attr(struct device_attribute *attr)
 {
 	return container_of(attr, struct power_supply_attr, dev_attr);
 }
···
 					  char *buf) {
 	ssize_t ret;
 	struct power_supply *psy = dev_get_drvdata(dev);
-	struct power_supply_attr *ps_attr = to_ps_attr(attr);
+	const struct power_supply_attr *ps_attr = to_ps_attr(attr);
 	enum power_supply_property psp = dev_attr_psp(attr);
 	union power_supply_propval value;
 
···
 					   const char *buf, size_t count) {
 	ssize_t ret;
 	struct power_supply *psy = dev_get_drvdata(dev);
-	struct power_supply_attr *ps_attr = to_ps_attr(attr);
+	const struct power_supply_attr *ps_attr = to_ps_attr(attr);
 	enum power_supply_property psp = dev_attr_psp(attr);
 	union power_supply_propval value;
 
···
 	NULL
 };
 
-void power_supply_init_attrs(void)
+void __init power_supply_init_attrs(void)
 {
 	int i;