From cbaab786ee67caf36b30bc10e2a3d6cd34a66500 Mon Sep 17 00:00:00 2001 From: Ulf Hansson Date: Wed, 10 Apr 2019 11:55:16 +0200 Subject: [PATCH] PM / core: Propagate dev->power.wakeup_path when no callbacks [ Upstream commit dc351d4c5f4fe4d0f274d6d660227be0c3a03317 ] The dev->power.direct_complete flag may become set in device_prepare() in case the device don't have any PM callbacks (dev->power.no_pm_callbacks is set). This leads to a broken behaviour, when there is child having wakeup enabled and relies on its parent to be used in the wakeup path. More precisely, when the direct complete path becomes selected for the child in __device_suspend(), the propagation of the dev->power.wakeup_path becomes skipped as well. Let's address this problem, by checking if the device is a part the wakeup path or has wakeup enabled, then prevent the direct complete path from being used. Reported-by: Loic Pallardy Signed-off-by: Ulf Hansson [ rjw: Comment cleanup ] Signed-off-by: Rafael J. Wysocki Signed-off-by: Sasha Levin --- drivers/base/power/main.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c index a690fd4..4abd7c6 100644 --- a/drivers/base/power/main.c +++ b/drivers/base/power/main.c @@ -1736,6 +1736,10 @@ static int __device_suspend(struct device *dev, pm_message_t state, bool async) if (dev->power.syscore) goto Complete; + /* Avoid direct_complete to let wakeup_path propagate. */ + if (device_may_wakeup(dev) || dev->power.wakeup_path) + dev->power.direct_complete = false; + if (dev->power.direct_complete) { if (pm_runtime_status_suspended(dev)) { pm_runtime_disable(dev); -- 2.7.4