Patch "Revert "leds: handle suspend/resume in heartbeat trigger"" has been added to the 4.9-stable tree

[<gregkh@linuxfoundation.org>]

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

    Revert "leds: handle suspend/resume in heartbeat trigger"

to the 4.9-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-leds-handle-suspend-resume-in-heartbeat-trigger.patch
and it can be found in the queue-4.9 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 436c4c45b5b9562b59cedbb51b7343ab4a6dd8cc Mon Sep 17 00:00:00 2001
From: Zhang Bo <bo.zhang@nxp.com>
Date: Tue, 13 Jun 2017 10:39:20 +0800
Subject: Revert "leds: handle suspend/resume in heartbeat trigger"

From: Zhang Bo <bo.zhang@nxp.com>

commit 436c4c45b5b9562b59cedbb51b7343ab4a6dd8cc upstream.

This reverts commit 5ab92a7cb82c66bf30685583a38a18538e3807db.

System cannot enter suspend mode because of heartbeat led trigger.
In autosleep_wq, try_to_suspend function will try to enter suspend
mode in specific period. it will get wakeup_count then call pm_notifier
chain callback function and freeze processes.
Heartbeat_pm_notifier is called and it call led_trigger_unregister to
change the trigger of led device to none. It will send uevent message
and the wakeup source count changed. As wakeup_count changed, suspend
will abort.

Fixes: 5ab92a7cb82c ("leds: handle suspend/resume in heartbeat trigger")
Signed-off-by: Zhang Bo <bo.zhang@nxp.com>
Acked-by: Pavel Machek <pavel@ucw.cz>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/leds/trigger/ledtrig-heartbeat.c |   31 -------------------------------
 1 file changed, 31 deletions(-)

--- a/drivers/leds/trigger/ledtrig-heartbeat.c
+++ b/drivers/leds/trigger/ledtrig-heartbeat.c
@@ -19,7 +19,6 @@
 #include <linux/sched.h>
 #include <linux/leds.h>
 #include <linux/reboot.h>
-#include <linux/suspend.h>
 #include "../leds.h"
 
 static int panic_heartbeats;
@@ -155,30 +154,6 @@ static struct led_trigger heartbeat_led_
 	.deactivate = heartbeat_trig_deactivate,
 };
 
-static int heartbeat_pm_notifier(struct notifier_block *nb,
-				 unsigned long pm_event, void *unused)
-{
-	int rc;
-
-	switch (pm_event) {
-	case PM_SUSPEND_PREPARE:
-	case PM_HIBERNATION_PREPARE:
-	case PM_RESTORE_PREPARE:
-		led_trigger_unregister(&heartbeat_led_trigger);
-		break;
-	case PM_POST_SUSPEND:
-	case PM_POST_HIBERNATION:
-	case PM_POST_RESTORE:
-		rc = led_trigger_register(&heartbeat_led_trigger);
-		if (rc)
-			pr_err("could not re-register heartbeat trigger\n");
-		break;
-	default:
-		break;
-	}
-	return NOTIFY_DONE;
-}
-
 static int heartbeat_reboot_notifier(struct notifier_block *nb,
 				     unsigned long code, void *unused)
 {
@@ -193,10 +168,6 @@ static int heartbeat_panic_notifier(stru
 	return NOTIFY_DONE;
 }
 
-static struct notifier_block heartbeat_pm_nb = {
-	.notifier_call = heartbeat_pm_notifier,
-};
-
 static struct notifier_block heartbeat_reboot_nb = {
 	.notifier_call = heartbeat_reboot_notifier,
 };
@@ -213,14 +184,12 @@ static int __init heartbeat_trig_init(vo
 		atomic_notifier_chain_register(&panic_notifier_list,
 					       &heartbeat_panic_nb);
 		register_reboot_notifier(&heartbeat_reboot_nb);
-		register_pm_notifier(&heartbeat_pm_nb);
 	}
 	return rc;
 }
 
 static void __exit heartbeat_trig_exit(void)
 {
-	unregister_pm_notifier(&heartbeat_pm_nb);
 	unregister_reboot_notifier(&heartbeat_reboot_nb);
 	atomic_notifier_chain_unregister(&panic_notifier_list,
 					 &heartbeat_panic_nb);


Patches currently in stable-queue which might be from bo.zhang@nxp.com are

queue-4.9/revert-leds-handle-suspend-resume-in-heartbeat-trigger.patch