linux-kernel - Re: [PATCH] libata, freezer: avoid block device removal while system is frozen

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Message-ID: <52ACCBE0.5060404@nigelcunningham.com.au>
Date:	Sun, 15 Dec 2013 08:21:36 +1100
From:	Nigel Cunningham <nigel@...elcunningham.com.au>
To:	Tejun Heo <tj@...nel.org>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>
CC:	Jens Axboe <axboe@...nel.dk>, tomaz.solc@...lix.org,
	aaron.lu@...el.com, linux-kernel@...r.kernel.org,
	Oleg Nesterov <oleg@...hat.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Fengguang Wu <fengguang.wu@...el.com>
Subject: Re: [PATCH] libata, freezer: avoid block device removal while system
 is frozen

Hi.

On 15/12/13 07:36, Tejun Heo wrote:
> On Sat, Dec 14, 2013 at 03:31:21PM -0500, Tejun Heo wrote:
>> So, all this is about hibernation?  Does that mean that it's safe to
>> unfreeze before invoking resume?  ie. we currently do,
>>
>> 	freeze
>> 	suspend devs
>> 	resume devs
>> 	unfreeze
>>
>> If we can just do,
>>
>> 	freeze
>> 	suspend devs
>> 	unfreeze
>> 	resume devs
> Ummm... even better, does that mean, in the long term, we can decouple
> freezing and device pm operations?  If this is just about hibernation,
> there's no reason to wrap device driver pm ops with freezer, right?
>
> Thanks.
>
Rafael has spent far more time than me thinking about the semantics 
here, so I'd like to defer to him. Rafael?...

Regards,

Nigel
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