linux-kernel - Re: [2.6.25-rc1] System no longer powers off after shutdown

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Date:	Wed, 13 Feb 2008 12:39:13 +0100
From:	Frans Pop <elendil@...net.nl>
To:	Greg KH <gregkh@...e.de>
Cc:	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org
Subject: Re: [2.6.25-rc1] System no longer powers off after shutdown

On Tuesday 12 February 2008, Greg KH wrote:
> On Tue, Feb 12, 2008 at 09:39:14PM +0100, Frans Pop wrote:
> > On Monday 11 February 2008, Frans Pop wrote:
> > > In general 2.6.25 if looking quite good on my desktop, but there's
> > > one important issue: the system no longer powers off after shutdown.
> > > This works fine with 2.6.24.
> >
> > Don't ask me why, but bisection shows this commit to be the cause of
> > the failure to power off:
> > commit c10997f6575f476ff38442fa18fd4a0d80345f9d
> > Author: Greg Kroah-Hartman <gregkh@...e.de>
> > Date:   Thu Dec 20 08:13:05 2007 -0800
> >
> >     Kobject: convert drivers/* from kobject_unregister() to
> > kobject_put()
> >
> > Because it seemed somewhat unlikely, I have double checked this by
> > doing an extra compilation for this commit and its predecessor.
>
> What is the symptom of not powering off?

I already noticed yesterday that there's one hunk in that commit that's not
a straight replacement:
diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index 9e102af..5efd555 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -1030,8 +1030,6 @@ static int __cpufreq_remove_dev (struct sys_device * sys_dev)

        unlock_policy_rwsem_write(cpu);

-       kobject_unregister(&data->kobj);
-
        kobject_put(&data->kobj);

        /* we need to make sure that the underlying kobj is actually


So, just on the off chance, I applied the patch below and bingo, the system
powers off again. I doubt this will be the correct solution, but just in
case it is, here's my signed off. A comment why the double put is needed
would probably be good though.

Signed-off-by: Frans Pop <elendil@...net.nl>

diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index 64926aa..9dbaac6 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -1058,6 +1058,7 @@ static int __cpufreq_remove_dev (struct sys_device * sys_dev)
 	unlock_policy_rwsem_write(cpu);
 
 	kobject_put(&data->kobj);
+	kobject_put(&data->kobj);
 
 	/* we need to make sure that the underlying kobj is actually
 	 * not referenced anymore by anybody before we proceed with
--
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