Patch "PM / sleep: Handle failures in device_suspend_late() consistently" has been added to the 4.6-stable tree

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

PM / sleep: Handle failures in device_suspend_late() consistently

to the 4.6-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:
pm-sleep-handle-failures-in-device_suspend_late-consistently.patch
and it can be found in the queue-4.6 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: "Rafael J. Wysocki" <[email protected]>
Date: Fri, 20 May 2016 23:09:49 +0200
Subject: PM / sleep: Handle failures in device_suspend_late() consistently

From: Rafael J. Wysocki <[email protected]>

commit 3a17fb329da68cb00558721aff876a80bba2fdb9 upstream.

Grygorii Strashko reports:

The PM runtime will be left disabled for the device if its .suspend_late() callback fails and async suspend is not allowed for this device. In this case device will not be added in dpm_late_early_list and dpm_resume_early() will ignore this device, as result PM runtime will be disabled for it forever (side effect: after 8 subsequent failures for the same device the PM runtime will be reenabled due to disable_depth overflow).

To fix this problem, add devices to dpm_late_early_list regardless of whether or not device_suspend_late() returns errors for them.

That will ensure failures in there to be handled consistently for all devices regardless of their async suspend/resume status.

---
 drivers/base/power/main.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

@@ -1267,14 +1267,15 @@ int dpm_suspend_late(pm_message_t state)
 		error = device_suspend_late(dev);
 
 		mutex_lock(&dpm_list_mtx);
+		if (!list_empty(&dev->power.entry))
+			list_move(&dev->power.entry, &dpm_late_early_list);
+
 		if (error) {
 			pm_dev_err(dev, state, " late", error);
 			dpm_save_failed_dev(dev_name(dev));
 			put_device(dev);
 			break;
 		}
-		if (!list_empty(&dev->power.entry))
-			list_move(&dev->power.entry, &dpm_late_early_list);
 		put_device(dev);
 
 		if (async_error)

Patches currently in stable-queue which might be from [email protected] are

queue-4.6/cpuidle-fix-cpuidle_state_is_coupled-argument-in-cpuidle_enter.patch queue-4.6/pm-sleep-handle-failures-in-device_suspend_late-consistently.patch queue-4.6/pm-runtime-fix-error-path-in-pm_runtime_force_resume.patch queue-4.6/cpuidle-indicate-when-a-device-has-been-unregistered.patch