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

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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:
da8aeb92d4
(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>
This commit is contained in:
Andy Whitcroft 2012-05-03 14:48:26 +01:00 committed by Len Brown
parent febb72a6e4
commit c597145696
1 changed files with 9 additions and 1 deletions
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10
drivers/acpi/battery.c
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@ -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);
}