linux-kernel - [PATCH v1 2/3] PM / sleep: try to runtime suspend for direct complete

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Date:	Wed, 24 Feb 2016 16:11:28 -0800
From:	Derek Basehore <dbasehore@...omium.org>
To:	linux-pm@...r.kernel.org
Cc:	"Rafael J . Wysocki" <rjw@...ysocki.net>,
	Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org,
	"James E . J . Bottomley" <JBottomley@...n.com>,
	"Martin K . Petersen" <martin.petersen@...cle.com>,
	linux-scsi@...r.kernel.org, Derek Basehore <dbasehore@...omium.org>
Subject: [PATCH v1 2/3] PM / sleep: try to runtime suspend for direct complete

This tries to runtime suspend devices that are still active for direct
complete. This is for cases such as autosuspend delays which leaves
devices able to runtime suspend but still active. It's beneficial in
this case to runtime suspend the device to take advantage of direct
complete when possible.

Signed-off-by: Derek Basehore <dbasehore@...omium.org>
Reviewed-by: Eric Caruso <ejcaruso@...omium.org>
---
 drivers/base/power/main.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c
index e0017d9..9693032 100644
--- a/drivers/base/power/main.c
+++ b/drivers/base/power/main.c
@@ -1380,7 +1380,12 @@ static int __device_suspend(struct device *dev, pm_message_t state, bool async)
 		goto Complete;
 
 	if (dev->power.direct_complete) {
-		if (pm_runtime_status_suspended(dev)) {
+		/*
+		 * Check if we're runtime suspended. If not, try to runtime
+		 * suspend for autosuspend cases.
+		 */
+		if (pm_runtime_status_suspended(dev) ||
+		    !pm_runtime_suspend(dev)) {
 			pm_runtime_disable(dev);
 			if (pm_runtime_status_suspended(dev))
 				goto Complete;
-- 
2.7.0.rc3.207.g0ac5344