Patch "Revert "ACPI: Execute _PTS before system reboot"" has been added to the 4.8-stable tree

[<gregkh@linuxfoundation.org>]

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

    Revert "ACPI: Execute _PTS before system reboot"

to the 4.8-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:
     revert-acpi-execute-_pts-before-system-reboot.patch
and it can be found in the queue-4.8 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 9713adc2a1a5488f4889c657a0c0ce0c16056d3c Mon Sep 17 00:00:00 2001
From: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Date: Mon, 21 Nov 2016 14:25:49 +0100
Subject: Revert "ACPI: Execute _PTS before system reboot"

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

commit 9713adc2a1a5488f4889c657a0c0ce0c16056d3c upstream.

Revert commit 2c85025c75df (ACPI: Execute _PTS before system reboot)
as it is reported to cause poweroff and reboot to hang on Dell
Latitude E7250.

Link: https://bugzilla.kernel.org/show_bug.cgi?id=187061
Reported-by:  Gianpaolo <gianpaoloc@gmail.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/acpi/sleep.c |   29 ++++++-----------------------
 1 file changed, 6 insertions(+), 23 deletions(-)

--- a/drivers/acpi/sleep.c
+++ b/drivers/acpi/sleep.c
@@ -47,32 +47,15 @@ static void acpi_sleep_tts_switch(u32 ac
 	}
 }
 
-static void acpi_sleep_pts_switch(u32 acpi_state)
-{
-	acpi_status status;
-
-	status = acpi_execute_simple_method(NULL, "\\_PTS", acpi_state);
-	if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
-		/*
-		 * OS can't evaluate the _PTS object correctly. Some warning
-		 * message will be printed. But it won't break anything.
-		 */
-		printk(KERN_NOTICE "Failure in evaluating _PTS object\n");
-	}
-}
-
-static int sleep_notify_reboot(struct notifier_block *this,
+static int tts_notify_reboot(struct notifier_block *this,
 			unsigned long code, void *x)
 {
 	acpi_sleep_tts_switch(ACPI_STATE_S5);
-
-	acpi_sleep_pts_switch(ACPI_STATE_S5);
-
 	return NOTIFY_DONE;
 }
 
-static struct notifier_block sleep_notifier = {
-	.notifier_call	= sleep_notify_reboot,
+static struct notifier_block tts_notifier = {
+	.notifier_call	= tts_notify_reboot,
 	.next		= NULL,
 	.priority	= 0,
 };
@@ -916,9 +899,9 @@ int __init acpi_sleep_init(void)
 	pr_info(PREFIX "(supports%s)\n", supported);
 
 	/*
-	 * Register the sleep_notifier to reboot notifier list so that the _TTS
-	 * and _PTS object can also be evaluated when the system enters S5.
+	 * Register the tts_notifier to reboot notifier list so that the _TTS
+	 * object can also be evaluated when the system enters S5.
 	 */
-	register_reboot_notifier(&sleep_notifier);
+	register_reboot_notifier(&tts_notifier);
 	return 0;
 }


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

queue-4.8/revert-acpi-execute-_pts-before-system-reboot.patch