From 95b982b45122c57da2ee0b46cce70775e1d987af Mon Sep 17 00:00:00 2001
From: Rajat Jain <rajatja@google.com>
Date: Tue, 31 Oct 2017 14:44:24 -0700
Subject: [PATCH] PM / s2idle: Clear the events_check_enabled flag
Git-commit: 95b982b45122c57da2ee0b46cce70775e1d987af
Patch-mainline: v4.15-rc1
References: bsc#1051510
Problem: This flag does not get cleared currently in the suspend or
resume path in the following cases:
* In case some driver's suspend routine returns an error.
* Successful s2idle case
* etc?
Why is this a problem: What happens is that the next suspend attempt
could fail even though the user did not enable the flag by writing to
/sys/power/wakeup_count. This is 1 use case how the issue can be seen
(but similar use case with driver suspend failure can be thought of):
1. Read /sys/power/wakeup_count
2. echo count > /sys/power/wakeup_count
3. echo freeze > /sys/power/wakeup_count
4. Let the system suspend, and wakeup the system using some wake source
that calls pm_wakeup_event() e.g. power button or something.
5. Note that the combined wakeup count would be incremented due
to the pm_wakeup_event() in the resume path.
6. After resuming the events_check_enabled flag is still set.
At this point if the user attempts to freeze again (without writing to
/sys/power/wakeup_count), the suspend would fail even though there has
been no wake event since the past resume.
Address that by clearing the flag just before a resume is completed,
so that it is always cleared for the corner cases mentioned above.
Signed-off-by: Rajat Jain <rajatja@google.com>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
kernel/power/suspend.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/kernel/power/suspend.c
+++ b/kernel/power/suspend.c
@@ -416,7 +416,6 @@ static int suspend_enter(suspend_state_t
error = suspend_ops->enter(state);
trace_suspend_resume(TPS("machine_suspend"),
state, false);
- events_check_enabled = false;
} else if (*wakeup) {
error = -EBUSY;
}
@@ -558,6 +557,7 @@ static int enter_state(suspend_state_t s
pm_restore_gfp_mask();
Finish:
+ events_check_enabled = false;
pr_debug("PM: Finishing wakeup.\n");
suspend_finish();
Unlock: