linux-kernel - [PATCH] PM / sleep: Don't unset parent's direct

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Date:	Wed, 25 Mar 2015 16:27:55 +0100
From:	Tomeu Vizoso <tomeu.vizoso@...labora.com>
To:	linux-kernel@...r.kernel.org
Cc:	Tomeu Vizoso <tomeu.vizoso@...labora.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Pavel Machek <pavel@....cz>, Len Brown <len.brown@...el.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-pm@...r.kernel.org
Subject: [PATCH] PM / sleep: Don't unset parent's direct_complete

If a device isn't going to be fully-suspended because there isn't an
implementation of the suspend callback, there's no need to make sure
that its parent is going to be fully-suspended as well.

Without this change, USB interface devices will always prevent the
proper USB device to stay in runtime suspension when the system
suspends.

Signed-off-by: Tomeu Vizoso <tomeu.vizoso@...labora.com>
---

Hi,

I'm not sure if this is the right fix, because I don't see why the USB
interface devices are in the dpm_list in the first place, so any comments will
be welcome.

Thanks,

Tomeu

---
 drivers/base/power/main.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c
index 3d874ec..6bac53f 100644
--- a/drivers/base/power/main.c
+++ b/drivers/base/power/main.c
@@ -1438,7 +1438,9 @@ static int __device_suspend(struct device *dev, pm_message_t state, bool async)
 		if (parent) {
 			spin_lock_irq(&parent->power.lock);
 
-			dev->parent->power.direct_complete = false;
+			if (callback)
+				parent->power.direct_complete = false;
+
 			if (dev->power.wakeup_path
 			    && !dev->parent->power.ignore_children)
 				dev->parent->power.wakeup_path = true;
-- 
2.1.0

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