[PATCH 2/2] ACPI battery: update battery status first when querying from sysfs

[Zhang Rui <rui.zhang@intel.com>]

Sometimes the Battery driver doesn't get notifications when it's
plugged/unplugged. And this results in the incorrect Battery
status reported by the power supply sysfs I/F.

Update the Battery status first when querying from sysfs.

Signed-off-by: Zhang Rui <rui.zhang@intel.com>
---
 drivers/acpi/battery.c |    3 +++
 1 file changed, 3 insertions(+)

Index: linux-2.6/drivers/acpi/battery.c
===================================================================
--- linux-2.6.orig/drivers/acpi/battery.c
+++ linux-2.6/drivers/acpi/battery.c
@@ -184,6 +184,9 @@ static int acpi_battery_get_property(str
 	int ret = 0;
 	struct acpi_battery *battery = to_acpi_battery(psy);
 
+	if (acpi_battery_update(battery))
+		return -ENODEV;
+
 	if (acpi_battery_present(battery)) {
 		/* run battery update only if it is present */
 		acpi_battery_get_state(battery);