Pull battery into release branch

drivers/acpi/battery.c

@@ -153,6 +153,8 @@ static int acpi_battery_get_property(struct power_supply *psy,
 			val->intval = POWER_SUPPLY_STATUS_CHARGING;
 		else if (battery->state == 0)
 			val->intval = POWER_SUPPLY_STATUS_FULL;
+		else
+			val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
 		break;
 	case POWER_SUPPLY_PROP_PRESENT:
 		val->intval = acpi_battery_present(battery);

drivers/acpi/sbs.c

@@ -113,6 +113,7 @@ struct acpi_battery {
 	u16 spec;
 	u8 id;
 	u8 present:1;
+	u8 have_sysfs_alarm:1;
 };
 
 #define to_acpi_battery(x) container_of(x, struct acpi_battery, bat);
@@ -808,7 +809,13 @@ static int acpi_battery_add(struct acpi_sbs *sbs, int id)
 	}
 	battery->bat.get_property = acpi_sbs_battery_get_property;
 	result = power_supply_register(&sbs->device->dev, &battery->bat);
-	device_create_file(battery->bat.dev, &alarm_attr);
+	if (result)
+		goto end;
+	result = device_create_file(battery->bat.dev, &alarm_attr);
+	if (result)
+		goto end;
+	battery->have_sysfs_alarm = 1;
+      end:
 	printk(KERN_INFO PREFIX "%s [%s]: Battery Slot [%s] (battery %s)\n",
 	       ACPI_SBS_DEVICE_NAME, acpi_device_bid(sbs->device),
 	       battery->name, sbs->battery->present ? "present" : "absent");
@@ -817,14 +824,16 @@ static int acpi_battery_add(struct acpi_sbs *sbs, int id)
 
 static void acpi_battery_remove(struct acpi_sbs *sbs, int id)
 {
-	if (sbs->battery[id].bat.dev)
-		device_remove_file(sbs->battery[id].bat.dev, &alarm_attr);
-		power_supply_unregister(&sbs->battery[id].bat);
-#ifdef CONFIG_ACPI_PROCFS
-	if (sbs->battery[id].proc_entry) {
-		acpi_sbs_remove_fs(&(sbs->battery[id].proc_entry),
-				   acpi_battery_dir);
+	struct acpi_battery *battery = &sbs->battery[id];
+
+	if (battery->bat.dev) {
+		if (battery->have_sysfs_alarm)
+			device_remove_file(battery->bat.dev, &alarm_attr);
+		power_supply_unregister(&battery->bat);
 	}
+#ifdef CONFIG_ACPI_PROCFS
+	if (battery->proc_entry)
+		acpi_sbs_remove_fs(&battery->proc_entry, acpi_battery_dir);
 #endif
 }