linux-kernel - [PATCH v1 1/5] PM: sleep: Fix runtime PM issue in dpm

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Message-Id: <20241114220921.2529905-2-saravanak@google.com>
Date: Thu, 14 Nov 2024 14:09:15 -0800
From: Saravana Kannan <saravanak@...gle.com>
To: "Rafael J. Wysocki" <rafael@...nel.org>, Pavel Machek <pavel@....cz>, Len Brown <len.brown@...el.com>, 
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Ingo Molnar <mingo@...hat.com>, 
	Peter Zijlstra <peterz@...radead.org>, Juri Lelli <juri.lelli@...hat.com>, 
	Vincent Guittot <vincent.guittot@...aro.org>, Dietmar Eggemann <dietmar.eggemann@....com>, 
	Steven Rostedt <rostedt@...dmis.org>, Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>, 
	Valentin Schneider <vschneid@...hat.com>
Cc: Saravana Kannan <saravanak@...gle.com>, Geert Uytterhoeven <geert@...ux-m68k.org>, 
	Marek Vasut <marex@...x.de>, Bird@...gle.com, Tim <Tim.Bird@...y.com>, 
	kernel-team@...roid.com, linux-pm@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: [PATCH v1 1/5] PM: sleep: Fix runtime PM issue in dpm_resume()

Some devices might have their is_suspended flag set to false. In these
cases, dpm_resume() should skip doing anything for those devices.
However, runtime PM enable and a few others steps are done before
checking for this flag. Fix it so that we do things in the right order.

Signed-off-by: Saravana Kannan <saravanak@...gle.com>
---
 drivers/base/power/main.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c
index 4a67e83300e1..86e51b9fefab 100644
--- a/drivers/base/power/main.c
+++ b/drivers/base/power/main.c
@@ -913,6 +913,9 @@ static void device_resume(struct device *dev, pm_message_t state, bool async)
 	if (dev->power.syscore)
 		goto Complete;
 
+	if (!dev->power.is_suspended)
+		goto Unlock;
+
 	if (dev->power.direct_complete) {
 		/* Match the pm_runtime_disable() in __device_suspend(). */
 		pm_runtime_enable(dev);
@@ -931,9 +934,6 @@ static void device_resume(struct device *dev, pm_message_t state, bool async)
 	 */
 	dev->power.is_prepared = false;
 
-	if (!dev->power.is_suspended)
-		goto Unlock;
-
 	if (dev->pm_domain) {
 		info = "power domain ";
 		callback = pm_op(&dev->pm_domain->ops, state);
-- 
2.47.0.338.g60cca15819-goog