linux-kernel - Re: [PATCH 4/6] kexec jump: in sync with hibernation implementation

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Date:	Thu, 07 Aug 2008 17:33:12 +0800
From:	Huang Ying <ying.huang@...el.com>
To:	Pavel Machek <pavel@...e.cz>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	nigel@...el.suspend2.net, "Rafael J. Wysocki" <rjw@...k.pl>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Vivek Goyal <vgoyal@...hat.com>, mingo@...e.hu,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Kexec Mailing List <kexec@...ts.infradead.org>
Subject: Re: [PATCH 4/6] kexec jump: in sync with hibernation implementation

On Thu, 2008-08-07 at 11:22 +0200, Pavel Machek wrote:
> > Add device_pm_lock() and device_pm_unlock() in kernel_kexec() to be
> > in sync with current hibernation implementation.
> > 
> > Signed-off-by: Huang Ying <ying.huang@...el.com>
> > 
> > ---
> >  kernel/kexec.c |    2 ++
> >  1 file changed, 2 insertions(+)
> > 
> > --- a/kernel/kexec.c
> > +++ b/kernel/kexec.c
> > @@ -1457,6 +1457,7 @@ int kernel_kexec(void)
> >  		error = disable_nonboot_cpus();
> >  		if (error)
> >  			goto Resume_devices;
> > +		device_pm_lock();
> >  		local_irq_disable();
> >  		/* At this point, device_suspend() has been called,
> >  		 * but *not* device_power_down(). We *must*
> > @@ -1485,6 +1486,7 @@ int kernel_kexec(void)
> >  		device_power_up(PMSG_RESTORE);
> >   Enable_irqs:
> >  		local_irq_enable();
> > +		device_pm_unlock();
> >  		enable_nonboot_cpus();
> >   Resume_devices:
> >  		device_resume(PMSG_RESTORE);
> > 
> 
> Would it be possible to create common function for hibernation and
> kexec? Keeping complex stuff like this in sync is ugly.

Yes, it is ugly. But it is a little difficult to do that. Hibernation
one is more complex than this one.

Best Regards,
Huang Ying


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