linux-kernel - [PATCH v2] PM / Hibernate: no kernel_power_off when pm_power

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Message-Id: <1398126646-29518-1-git-send-email-sebastian.capella@linaro.org>
Date:	Mon, 21 Apr 2014 17:30:46 -0700
From:	Sebastian Capella <sebastian.capella@...aro.org>
To:	linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
	linaro-kernel@...ts.linaro.org
Cc:	Sebastian Capella <sebastian.capella@...aro.org>,
	Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Russell King <linux@....linux.org.uk>,
	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>
Subject: [PATCH v2] PM / Hibernate: no kernel_power_off when pm_power_off NULL

Reboot logic in kernel/reboot will avoid calling kernel_power_off
when pm_power_off is null, and instead uses kernel_halt.  Change
hibernate's power_down to follow the behavior in the reboot call.

Calling the notifier twice (once for SYS_POWER_OFF and again for
SYS_HALT) causes a panic during hibernation on Kirkwood
Openblocks A6 board.

Signed-off-by: Sebastian Capella <sebastian.capella@...aro.org>
Reported-by: Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>
Cc: Len Brown <len.brown@...el.com>
Cc: Pavel Machek <pavel@....cz>
Cc: "Rafael J. Wysocki" <rjw@...ysocki.net>
Cc: Russell King <linux@....linux.org.uk>
Cc: One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>

---
 kernel/power/hibernate.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c
index f4f2073..7642932 100644
--- a/kernel/power/hibernate.c
+++ b/kernel/power/hibernate.c
@@ -595,7 +595,8 @@ static void power_down(void)
 	case HIBERNATION_PLATFORM:
 		hibernation_platform_enter();
 	case HIBERNATION_SHUTDOWN:
-		kernel_power_off();
+		if (pm_power_off)
+			kernel_power_off();
 		break;
 #ifdef CONFIG_SUSPEND
 	case HIBERNATION_SUSPEND:
@@ -623,7 +624,8 @@ static void power_down(void)
 	 * corruption after resume.
 	 */
 	printk(KERN_CRIT "PM: Please power down manually\n");
-	while(1);
+	while (1)
+		cpu_relax();
 }

 /**
-- 
1.7.9.5

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