Commit c5971456 authored May 03, 2012 by Andy Whitcroft Committed by Len Brown May 08, 2012

ACPI battery: only refresh the sysfs files when pertinent information changes



We only need to regenerate the sysfs files when the capacity units
change, avoid the update otherwise.

The origin of this issue is dates way back to 2.6.38:
da8aeb92
(ACPI / Battery: Update information on info notification and resume)

cc: <stable@vger.kernel.org>
Signed-off-by: Andy Whitcroft <apw@canonical.com>
Tested-by: Ralf Jung <post@ralfj.de>
Signed-off-by: Len Brown <len.brown@intel.com>

parent febb72a6

drivers/acpi/battery.c

+9 −1

Original line number	Diff line number	Diff line
		@@ -643,11 +643,19 @@ static int acpi_battery_update(struct acpi_battery *battery)

		static void acpi_battery_refresh(struct acpi_battery *battery)
		{
		int power_unit;

		if (!battery->bat.dev)
		return;

		power_unit = battery->power_unit;

		acpi_battery_get_info(battery);
		/* The battery may have changed its reporting units. */

		if (power_unit == battery->power_unit)
		return;

		/* The battery has changed its reporting units. */
		sysfs_remove_battery(battery);
		sysfs_add_battery(battery);
		}

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