Patch "PM / sleep: Clear pm_suspend_global_flags upon hibernate" has been added to the 4.4-stable tree

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

PM / sleep: Clear pm_suspend_global_flags upon hibernate

to the 4.4-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-clear-pm_suspend_global_flags-upon-hibernate.patch
and it can be found in the queue-4.4 subdirectory.

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

From: Lukas Wunner <[email protected]>
Date: Wed, 23 Mar 2016 00:11:20 +0100
Subject: PM / sleep: Clear pm_suspend_global_flags upon hibernate

From: Lukas Wunner <[email protected]>

commit 276142730c39c9839465a36a90e5674a8c34e839 upstream.

When suspending to RAM, waking up and later suspending to disk, we gratuitously runtime resume devices after the thaw phase. This does not occur if we always suspend to RAM or always to disk.

pm_complete_with_resume_check(), which gets called from pci_pm_complete() among others, schedules a runtime resume if PM_SUSPEND_FLAG_FW_RESUME is set. The flag is set during a suspend-to-RAM cycle. It is cleared at the beginning of the suspend-to-RAM cycle but not afterwards and it is not cleared during a suspend-to-disk cycle at all. Fix it.

---
 kernel/power/hibernate.c |    1 +
 1 file changed, 1 insertion(+)

@@ -339,6 +339,7 @@ int hibernation_snapshot(int platform_mo
 	pm_message_t msg;
 	int error;
 
+	pm_suspend_clear_flags();
 	error = platform_begin(platform_mode);
 	if (error)
 		goto Close;

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

queue-4.4/pm-sleep-clear-pm_suspend_global_flags-upon-hibernate.patch queue-4.4/acpi-pm-runtime-resume-devices-when-waking-from-hibernate.patch