[3.11.y.z extended stable] Patch "ACPI / processor: do not mark present at boot but not onlined CPU as onlined" has been added to staging queue

[Luis Henriques]

This is a note to let you know that I have just added a patch titled

    ACPI / processor: do not mark present at boot but not onlined CPU as onlined

to the linux-3.11.y-queue branch of the 3.11.y.z extended stable tree 
which can be found at:

 http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.11.y-queue

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.11.y.z tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Luis

------

>From 016cdb705d64d55a707744607f86410db0931f8c Mon Sep 17 00:00:00 2001
From: Igor Mammedov <imammedo at redhat.com>
Date: Mon, 5 May 2014 22:49:49 +0200
Subject: ACPI / processor: do not mark present at boot but not onlined CPU as
 onlined

commit 0b9d46dd7debf8e6dc8614106f1c1909fa8de64d upstream.

acpi_processor_add() assumes that present at boot CPUs
are always onlined, it is not so if a CPU failed to become
onlined. As result acpi_processor_add() will mark such CPU
device as onlined in sysfs and following attempts to
online/offline it using /sys/device/system/cpu/cpuX/online
attribute will fail.

Do not poke into device internals in acpi_processor_add()
and touch "struct device { .offline }" attribute, since
for CPUs onlined at boot it's set by:
  topology_init() -> arch_register_cpu() -> register_cpu()
before ACPI device tree is parsed, and for hotplugged
CPUs it's set when userspace onlines CPU via sysfs.

Signed-off-by: Igor Mammedov <imammedo at redhat.com>
Acked-by: Toshi Kani <toshi.kani at hp.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki at intel.com>
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
---
 drivers/acpi/acpi_processor.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/acpi/acpi_processor.c b/drivers/acpi/acpi_processor.c
index 5a74a9c1e42c..0611a1cda874 100644
--- a/drivers/acpi/acpi_processor.c
+++ b/drivers/acpi/acpi_processor.c
@@ -403,7 +403,6 @@ static int acpi_processor_add(struct acpi_device *device,
 		goto err;

 	pr->dev = dev;
-	dev->offline = pr->flags.need_hotplug_init;

 	/* Trigger the processor driver's .probe() if present. */
 	if (device_attach(dev) >= 0)
--
1.9.1