linux-kernel - Re: [PATCH]: In kernel hibernation, suspend to both

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Message-ID: <4FB269BF.3090801@linux.vnet.ibm.com>
Date:	Tue, 15 May 2012 20:05:43 +0530
From:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
To:	Bojan Smojver <bojan@...ursive.com>
CC:	Alan Stern <stern@...land.harvard.edu>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linux PM list <linux-pm@...r.kernel.org>,
	Kernel development list <linux-kernel@...r.kernel.org>,
	bp@...en8.de
Subject: Re: [PATCH]: In kernel hibernation, suspend to both

On 05/15/2012 05:29 AM, Bojan Smojver wrote:

> On Mon, 2012-05-14 at 21:47 +1000, Bojan Smojver wrote:
>> No. That hangs my box.
>>
>> This triggers a bug in workqueues code (essentially the same as the
>> previous patch, except for sys_sync() not being done):
> 
> Alan/Srivatsa,
> 
> Coming back to the explanation of how this whole thing works, it would
> seem that at the point of image writing all devices are fully functional
> (not just some, as I mistakenly believed). However, the processes are
> supposed to be already frozen, right? Calling suspend_prepare(), which
> will essentially try to freeze the processes and kernel threads, seems
> like the wrong thing to do.
> 
> Did you guys mean that we should be calling
> pm_notifier_call_chain(PM_SUSPEND_PREPARE) only here?
> 


Exactly! And also arrange for the corresponding PM_POST_SUSPEND notification
to happen at the end of suspend-to-ram stage...

Regards,
Srivatsa S. Bhat

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