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

Nigel Cunningham
2013-12-14T21:21:46Z

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