This is a note to let you know that I've just added the patch titled

ACPI / scan: Enable GPEs before scanning the namespace

to the 4.13-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: acpi-scan-enable-gpes-before-scanning-the-namespace.patch and it can be found in the queue-4.13 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.

From eb7f43c4adb4a789f99f53916182c3401b4e33c7 Mon Sep 17 00:00:00 2001

From: "Rafael J. Wysocki" rafael.j.wysocki@intel.com Date: Thu, 10 Aug 2017 00:34:23 +0200 Subject: ACPI / scan: Enable GPEs before scanning the namespace

From: Rafael J. Wysocki rafael.j.wysocki@intel.com

commit eb7f43c4adb4a789f99f53916182c3401b4e33c7 upstream.

On some systems the platform firmware expects GPEs to be enabled before the enumeration of devices and if that expectation is not met, the systems in question may not boot in some situations.

For this reason, change the initialization ordering of the ACPI subsystem to make it enable GPEs before scanning the namespace for the first time in order to enumerate devices.

Reported-by: Mika Westerberg mika.westerberg@linux.intel.com Suggested-by: Mika Westerberg mika.westerberg@linux.intel.com Signed-off-by: Rafael J. Wysocki rafael.j.wysocki@intel.com Acked-by: Lv Zheng lv.zheng@intel.com Tested-by: Mika Westerberg mika.westerberg@linux.intel.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org

--- drivers/acpi/scan.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)

--- a/drivers/acpi/scan.c +++ b/drivers/acpi/scan.c @@ -2058,6 +2058,9 @@ int __init acpi_scan_init(void) acpi_get_spcr_uart_addr(); }

+ acpi_gpe_apply_masked_gpes(); + acpi_update_all_gpes(); + mutex_lock(&acpi_scan_lock); /* * Enumerate devices in the ACPI namespace. @@ -2082,9 +2085,6 @@ int __init acpi_scan_init(void) } }

- acpi_gpe_apply_masked_gpes(); - acpi_update_all_gpes(); - acpi_scan_initialized = true;

out:

Patches currently in stable-queue which might be from rafael.j.wysocki@intel.com are

queue-4.13/acpi-pm-blacklist-low-power-s0-idle-_dsm-for-dell-xps13-9360.patch queue-4.13/acpica-make-it-possible-to-enable-runtime-gpes-earlier.patch queue-4.13/acpica-dispatch-active-gpes-at-init-time.patch queue-4.13/acpi-scan-enable-gpes-before-scanning-the-namespace.patch