test_power: Fix a bug in setting module parameter values

When the kernel loads a module, module params are processed prior to
calling module_init. As a result, setting module param value should not
have side effects, at least as long as the module has not been
initialized.

Signed-off-by: Andrey Gelman <[e-mail]>
Signed-off-by: Anton Vorontsov <[e-mail]>

drivers/power/test_power.c

···
 static int battery_capacity		= 50;
 static int battery_voltage		= 3300;
 
+static bool module_initialized;
+
 static int test_power_get_ac_property(struct power_supply *psy,
 				      enum power_supply_property psp,
 				      union power_supply_propval *val)
···
 		}
 	}
 
+	module_initialized = true;
 	return 0;
 failed:
 	while (--i >= 0)
···
 
 	for (i = 0; i < ARRAY_SIZE(test_power_supplies); i++)
 		power_supply_unregister(&test_power_supplies[i]);
+
+	module_initialized = false;
 }
 module_exit(test_power_exit);
 
···
 };
 
 static struct battery_property_map map_ac_online[] = {
-	{ 0,  "on"  },
-	{ 1,  "off" },
+	{ 0,  "off"  },
+	{ 1,  "on" },
 	{ -1, NULL  },
 };
 
···
 	return def_key;
 }
 
+static inline void signal_power_supply_changed(struct power_supply *psy)
+{
+	if (module_initialized)
+		power_supply_changed(psy);
+}
+
 static int param_set_ac_online(const char *key, const struct kernel_param *kp)
 {
 	ac_online = map_get_value(map_ac_online, key, ac_online);
-	power_supply_changed(&test_power_supplies[0]);
+	signal_power_supply_changed(&test_power_supplies[0]);
 	return 0;
 }
 
···
 static int param_set_usb_online(const char *key, const struct kernel_param *kp)
 {
 	usb_online = map_get_value(map_ac_online, key, usb_online);
-	power_supply_changed(&test_power_supplies[2]);
+	signal_power_supply_changed(&test_power_supplies[2]);
 	return 0;
 }
 
···
 					const struct kernel_param *kp)
 {
 	battery_status = map_get_value(map_status, key, battery_status);
-	power_supply_changed(&test_power_supplies[1]);
+	signal_power_supply_changed(&test_power_supplies[1]);
 	return 0;
 }
 
···
 					const struct kernel_param *kp)
 {
 	battery_health = map_get_value(map_health, key, battery_health);
-	power_supply_changed(&test_power_supplies[1]);
+	signal_power_supply_changed(&test_power_supplies[1]);
 	return 0;
 }
 
···
 					const struct kernel_param *kp)
 {
 	battery_present = map_get_value(map_present, key, battery_present);
-	power_supply_changed(&test_power_supplies[0]);
+	signal_power_supply_changed(&test_power_supplies[0]);
 	return 0;
 }
 
···
 {
 	battery_technology = map_get_value(map_technology, key,
 						battery_technology);
-	power_supply_changed(&test_power_supplies[1]);
+	signal_power_supply_changed(&test_power_supplies[1]);
 	return 0;
 }
 
···
 		return -EINVAL;
 
 	battery_capacity = tmp;
-	power_supply_changed(&test_power_supplies[1]);
+	signal_power_supply_changed(&test_power_supplies[1]);
 	return 0;
 }
 
···
 		return -EINVAL;
 
 	battery_voltage = tmp;
-	power_supply_changed(&test_power_supplies[1]);
+	signal_power_supply_changed(&test_power_supplies[1]);
 	return 0;
 }