This is a note to let you know that I've just added the patch titled
ACPI / hotplug: Fix conflicted PCI bridge notify handlers
to the 3.12-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-hotplug-fix-conflicted-pci-bridge-notify-handlers.patch
and it can be found in the queue-3.12 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From ca499fc87ed945094d952da0eb7eea7dbeb1feec Mon Sep 17 00:00:00 2001
From: Toshi Kani <[email protected]>
Date: Wed, 20 Nov 2013 14:25:34 +0100
Subject: ACPI / hotplug: Fix conflicted PCI bridge notify handlers
From: Toshi Kani <[email protected]>
commit ca499fc87ed945094d952da0eb7eea7dbeb1feec upstream.
The PCI host bridge scan handler installs its own notify handler,
handle_hotplug_event_root(), by itself. Nevertheless, the ACPI
hotplug framework also installs the common notify handler,
acpi_hotplug_notify_cb(), for PCI root bridges. This causes
acpi_hotplug_notify_cb() to call _OST method with unsupported
error as hotplug.enabled is not set.
To address this issue, introduce hotplug.ignore flag, which
indicates that the scan handler installs its own notify handler by
itself. The ACPI hotplug framework does not install the common
notify handler when this flag is set.
Signed-off-by: Toshi Kani <[email protected]>
[rjw: Changed the name of the new flag]
Signed-off-by: Rafael J. Wysocki <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/acpi/pci_root.c | 3 +++
drivers/acpi/scan.c | 2 +-
include/acpi/acpi_bus.h | 1 +
3 files changed, 5 insertions(+), 1 deletion(-)
--- a/drivers/acpi/pci_root.c
+++ b/drivers/acpi/pci_root.c
@@ -63,6 +63,9 @@ static struct acpi_scan_handler pci_root
.ids = root_device_ids,
.attach = acpi_pci_root_add,
.detach = acpi_pci_root_remove,
+ .hotplug = {
+ .ignore = true,
+ },
};
static DEFINE_MUTEX(osc_lock);
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -1812,7 +1812,7 @@ static void acpi_scan_init_hotplug(acpi_
*/
list_for_each_entry(hwid, &pnp.ids, list) {
handler = acpi_scan_match_handler(hwid->id, NULL);
- if (handler) {
+ if (handler && !handler->hotplug.ignore) {
acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
acpi_hotplug_notify_cb, handler);
break;
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -100,6 +100,7 @@ enum acpi_hotplug_mode {
struct acpi_hotplug_profile {
struct kobject kobj;
bool enabled:1;
+ bool ignore:1;
enum acpi_hotplug_mode mode;
};
Patches currently in stable-queue which might be from [email protected] are
queue-3.12/acpi-hotplug-fix-conflicted-pci-bridge-notify-handlers.patch
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