linux-kernel - [PATCH 7/10 v6] PM / Domains: Don't stop wakeup devices during system sleep transitions

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Message-Id: <201106252329.24342.rjw@sisk.pl>
Date:	Sat, 25 Jun 2011 23:29:24 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Linux PM mailing list <linux-pm@...ts.linux-foundation.org>
Cc:	"Greg Kroah-Hartman" <gregkh@...e.de>,
	Magnus Damm <magnus.damm@...il.com>,
	Paul Walmsley <paul@...an.com>, Kevin Hilman <khilman@...com>,
	Alan Stern <stern@...land.harvard.edu>,
	LKML <linux-kernel@...r.kernel.org>, linux-sh@...r.kernel.org,
	Paul Mundt <lethal@...ux-sh.org>
Subject: [PATCH 7/10 v6] PM / Domains: Don't stop wakeup devices during system sleep transitions

From: Rafael J. Wysocki <rjw@...k.pl>

Devices that are set up to wake up the system from sleep states
should not be stopped and power should not be removed from them
when the system goes into a sleep state.  Make the generic PM domain
code respect that limitation.

Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
---
 drivers/base/power/domain.c |    6 ++++++
 1 file changed, 6 insertions(+)

Index: linux-2.6/drivers/base/power/domain.c
===================================================================
--- linux-2.6.orig/drivers/base/power/domain.c
+++ linux-2.6/drivers/base/power/domain.c
@@ -445,6 +445,9 @@ static int pm_genpd_suspend_noirq(struct
 	if (ret)
 		return ret;
 
+	if (device_may_wakeup(dev))
+		return 0;
+
 	if (genpd->stop_device)
 		genpd->stop_device(dev);
 
@@ -665,6 +668,9 @@ static int pm_genpd_dev_poweroff_noirq(s
 	if (ret)
 		return ret;
 
+	if (device_may_wakeup(dev))
+		return 0;
+
 	if (genpd->stop_device)
 		genpd->stop_device(dev);
 

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