linux-kernel - Re: [2.6.23-rc1 REGRESSION] ThinkPad T42 poweroff failure by "PM: Introduce pm_power_off

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Date:	Thu, 26 Jul 2007 14:12:33 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	YOSHIFUJI Hideaki /
	 吉藤英明 
	<yoshfuji@...ux-ipv6.org>
Cc:	pavel@....cz, akpm@...ux-foundation.org,
	torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [2.6.23-rc1 REGRESSION] ThinkPad T42 poweroff failure by "PM: Introduce pm_power_off_prepare"

On Wednesday, 25 July 2007 17:28, YOSHIFUJI Hideaki / 吉藤英明 wrote:
> Hello.
> 
> In article <200707251446.56809.rjw@...k.pl> (at Wed, 25 Jul 2007 14:46:55 +0200), "Rafael J. Wysocki" <rjw@...k.pl> says:
> 
> > On Wednesday, 25 July 2007 00:19, YOSHIFUJI Hideaki / 吉藤英明 wrote:
> :
> > > Linux 2.6.23-rc1 fails to power off my ThinkPad T42.
> > > Git-bisect told me that the following commit is to blame,
> > > and by reverting that commit, it works appropriately.
> > 
> > (1) Can you please apply the appended patch and see if the message gets
> >     printed when you try to power off the system?
> 
> Yup, I got it.  Last lines are:

Hmm, it looks like we have a code ordering issue in there.

Can you please check if the appended patch helps?

Greetings,
Rafael


---
 drivers/base/power/shutdown.c |    2 --
 include/linux/device.h        |    3 +++
 kernel/power/disk.c           |    1 +
 kernel/sys.c                  |    3 +++
 4 files changed, 7 insertions(+), 2 deletions(-)

Index: linux-2.6.23-rc1/drivers/base/power/shutdown.c
===================================================================
--- linux-2.6.23-rc1.orig/drivers/base/power/shutdown.c	2007-07-09 01:32:17.000000000 +0200
+++ linux-2.6.23-rc1/drivers/base/power/shutdown.c	2007-07-26 12:24:37.000000000 +0200
@@ -44,7 +44,5 @@ void device_shutdown(void)
 			dev->driver->shutdown(dev);
 		}
 	}
-
-	sysdev_shutdown();
 }
 
Index: linux-2.6.23-rc1/kernel/sys.c
===================================================================
--- linux-2.6.23-rc1.orig/kernel/sys.c	2007-07-23 22:07:02.000000000 +0200
+++ linux-2.6.23-rc1/kernel/sys.c	2007-07-26 12:08:07.000000000 +0200
@@ -804,6 +804,7 @@ static void kernel_restart_prepare(char 
 	blocking_notifier_call_chain(&reboot_notifier_list, SYS_RESTART, cmd);
 	system_state = SYSTEM_RESTART;
 	device_shutdown();
+	sysdev_shutdown();
 }
 
 /**
@@ -860,6 +861,7 @@ void kernel_shutdown_prepare(enum system
 void kernel_halt(void)
 {
 	kernel_shutdown_prepare(SYSTEM_HALT);
+	sysdev_shutdown();
 	printk(KERN_EMERG "System halted.\n");
 	machine_halt();
 }
@@ -876,6 +878,7 @@ void kernel_power_off(void)
 	kernel_shutdown_prepare(SYSTEM_POWER_OFF);
 	if (pm_power_off_prepare)
 		pm_power_off_prepare();
+	sysdev_shutdown();
 	printk(KERN_EMERG "Power down.\n");
 	machine_power_off();
 }
Index: linux-2.6.23-rc1/kernel/power/disk.c
===================================================================
--- linux-2.6.23-rc1.orig/kernel/power/disk.c	2007-07-26 12:13:58.000000000 +0200
+++ linux-2.6.23-rc1/kernel/power/disk.c	2007-07-26 12:14:23.000000000 +0200
@@ -216,6 +216,7 @@ int hibernation_platform_enter(void)
 		 * sleep state after all
 		 */
 		error = hibernation_ops->prepare();
+		sysdev_shutdown();
 		if (!error)
 			error = hibernation_ops->enter();
 	} else {
Index: linux-2.6.23-rc1/include/linux/device.h
===================================================================
--- linux-2.6.23-rc1.orig/include/linux/device.h	2007-07-23 22:06:59.000000000 +0200
+++ linux-2.6.23-rc1/include/linux/device.h	2007-07-26 12:48:05.000000000 +0200
@@ -551,6 +551,9 @@ extern void put_device(struct device * d
 /* drivers/base/power/shutdown.c */
 extern void device_shutdown(void);
 
+/* drivers/base/sys.c */
+extern void sysdev_shutdown(void);
+
 
 /* drivers/base/firmware.c */
 extern int __must_check firmware_register(struct kset *);
-
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