This is a note to let you know that I've just added the patch titled
ACPI battery: only refresh the sysfs files when pertinent information
changes
to the 3.0-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
acpi-battery-only-refresh-the-sysfs-files-when-pertinent-information-changes.patch
and it can be found in the queue-3.0 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From c5971456964290da7e98222892797b71ef793e62 Mon Sep 17 00:00:00 2001
From: Andy Whitcroft <[email protected]>
Date: Thu, 3 May 2012 14:48:26 +0100
Subject: ACPI battery: only refresh the sysfs files when pertinent information
changes
From: Andy Whitcroft <[email protected]>
commit c5971456964290da7e98222892797b71ef793e62 upstream.
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:
da8aeb92d4853f37e281f11fddf61f9c7d84c3cd
(ACPI / Battery: Update information on info notification and resume)
Signed-off-by: Andy Whitcroft <[email protected]>
Tested-by: Ralf Jung <[email protected]>
Signed-off-by: Len Brown <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/acpi/battery.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
--- a/drivers/acpi/battery.c
+++ b/drivers/acpi/battery.c
@@ -635,11 +635,19 @@ static int acpi_battery_update(struct ac
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);
}
Patches currently in stable-queue which might be from [email protected] are
queue-3.0/acpi-battery-only-refresh-the-sysfs-files-when-pertinent-information-changes.patch
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