linux-kernel - [PATCH 4.15 093/168] PM / domains: Dont skip drivers ->suspend|resume

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Date:   Wed, 11 Apr 2018 00:23:55 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Ulf Hansson <ulf.hansson@...aro.org>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.15 093/168] PM / domains: Dont skip drivers ->suspend|resume_noirq() callbacks

4.15-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Ulf Hansson <ulf.hansson@...aro.org>


[ Upstream commit a935424bb658f9ca37eb5e94119b857998341356 ]

Commit 10da65423fdb (PM / Domains: Call driver's noirq callbacks)
started to respect driver's noirq callbacks, but while doing that it
also introduced a few potential problems.

More precisely, in genpd_finish_suspend() and genpd_resume_noirq()
the noirq callbacks at the driver level should be invoked, no matter
of whether dev->power.wakeup_path is set or not.

Additionally, the commit in question also made genpd_resume_noirq()
to ignore the return value from pm_runtime_force_resume().

Let's fix both these issues!

Fixes: 10da65423fdb (PM / Domains: Call driver's noirq callbacks)
Signed-off-by: Ulf Hansson <ulf.hansson@...aro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/base/power/domain.c |   30 +++++++++++++++++-------------
 1 file changed, 17 insertions(+), 13 deletions(-)

--- a/drivers/base/power/domain.c
+++ b/drivers/base/power/domain.c
@@ -1032,15 +1032,12 @@ static int genpd_prepare(struct device *
 static int genpd_finish_suspend(struct device *dev, bool poweroff)
 {
 	struct generic_pm_domain *genpd;
-	int ret;
+	int ret = 0;
 
 	genpd = dev_to_genpd(dev);
 	if (IS_ERR(genpd))
 		return -EINVAL;
 
-	if (dev->power.wakeup_path && genpd_is_active_wakeup(genpd))
-		return 0;
-
 	if (poweroff)
 		ret = pm_generic_poweroff_noirq(dev);
 	else
@@ -1048,10 +1045,18 @@ static int genpd_finish_suspend(struct d
 	if (ret)
 		return ret;
 
+	if (dev->power.wakeup_path && genpd_is_active_wakeup(genpd))
+		return 0;
+
 	if (genpd->dev_ops.stop && genpd->dev_ops.start) {
 		ret = pm_runtime_force_suspend(dev);
-		if (ret)
+		if (ret) {
+			if (poweroff)
+				pm_generic_restore_noirq(dev);
+			else
+				pm_generic_resume_noirq(dev);
 			return ret;
+		}
 	}
 
 	genpd_lock(genpd);
@@ -1085,7 +1090,7 @@ static int genpd_suspend_noirq(struct de
 static int genpd_resume_noirq(struct device *dev)
 {
 	struct generic_pm_domain *genpd;
-	int ret = 0;
+	int ret;
 
 	dev_dbg(dev, "%s()\n", __func__);
 
@@ -1094,21 +1099,20 @@ static int genpd_resume_noirq(struct dev
 		return -EINVAL;
 
 	if (dev->power.wakeup_path && genpd_is_active_wakeup(genpd))
-		return 0;
+		return pm_generic_resume_noirq(dev);
 
 	genpd_lock(genpd);
 	genpd_sync_power_on(genpd, true, 0);
 	genpd->suspended_count--;
 	genpd_unlock(genpd);
 
-	if (genpd->dev_ops.stop && genpd->dev_ops.start)
+	if (genpd->dev_ops.stop && genpd->dev_ops.start) {
 		ret = pm_runtime_force_resume(dev);
+		if (ret)
+			return ret;
+	}
 
-	ret = pm_generic_resume_noirq(dev);
-	if (ret)
-		return ret;
-
-	return ret;
+	return pm_generic_resume_noirq(dev);
 }
 
 /**