linux-kernel - Re: thermal / x86: Fix init error code path in package temperature driver

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Date:	Mon, 22 Jul 2013 09:31:02 +0800
From:	Zhang Rui <rui.zhang@...el.com>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:	Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux PM list <linux-pm@...r.kernel.org>
Subject: Re: thermal / x86: Fix init error code path in package temperature
 driver

On Sun, 2013-07-21 at 15:03 +0200, Rafael J. Wysocki wrote:
> On Saturday, July 20, 2013 11:30:44 PM Srinivas Pandruvada wrote:
> > Hi Rafael,
> > 
> > This is already fixed and currently merged to MM tree. So this should 
> > make to rc2.
> > I don't know whether Rui will push or MM maintainer will push this change.
> 
> Usually Andrew Morton (who maintains -mm) prefers maintainers to push things to
> Linus.
> 
I'll push it for rc2.

thanks,
rui
> Thanks,
> Rafael
> 
> 
> > On 07/20/2013 01:48 PM, Rafael J. Wysocki wrote:
> > > From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> > >
> > > The error code path of the x86 package temperature thermal driver's
> > > initialization routine, pkg_temp_thermal_init(), makes an unbalanced
> > > call to get_online_cpus(), which causes subsequent CPU offline
> > > operations, and consequently system suspend, to permanently block
> > > in cpu_hotplug_begin() on systems where get_core_online() returns
> > > an error code.
> > >
> > > Remove the extra get_online_cpus() to fix the problem (tested on
> > > Toshiba Portege R500).
> > >
> > > Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> > > ---
> > >   drivers/thermal/x86_pkg_temp_thermal.c |    1 -
> > >   1 file changed, 1 deletion(-)
> > >
> > > Index: linux-pm/drivers/thermal/x86_pkg_temp_thermal.c
> > > ===================================================================
> > > --- linux-pm.orig/drivers/thermal/x86_pkg_temp_thermal.c
> > > +++ linux-pm/drivers/thermal/x86_pkg_temp_thermal.c
> > > @@ -592,7 +592,6 @@ static int __init pkg_temp_thermal_init(
> > >   	return 0;
> > >   
> > >   err_ret:
> > > -	get_online_cpus();
> > >   	for_each_online_cpu(i)
> > >   		put_core_offline(i);
> > >   	put_online_cpus();
> > >
> > >
> > 


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