Re: [linux-pm] [RFC] ACPI vs device ordering on resume

[Alexey Starikovskiy <alexey.y.starikovskiy@linux.intel.com>]

Linus Torvalds wrote:
> On Fri, 1 Dec 2006, Pavel Machek wrote:
>
>   
>>>> So it looks like we need this sequence:
>>>>
>>>> enable_nonboot_cpus() /* INIT */
>>>> finish()	/* _WAK */
>>>> device_resume()
>>>>         
>>> Can somebody remind me about this immediately after 2.6.19?
>>>       
>> Remind. But note that freezer is not yet SMP safe... Rafael is working
>> on that.
>>     
>
> Thanks.
>
> On the other hand, I really wonder (and suspect) whether the problem isn't 
> really the freezer or even the kernel resume ordering, but simply an ACPI 
> internal resume ordering thing.
>
> Doesn't ACPI have per-device "WAK" calls anyway? Shouldn't we just call 
> those _individually_ as we walk the device tree (perhaps in the 
> "early_resume" stage) rather than calling them all in one chunk?
>
> 		Linus
>   
_WAK method is system-wide. Individual objects do not have their own 
resume methods.
One way of reordering internal ACPI resume is done in patch series to 
7122, I mentioned that earlier.
It's possible to resume ACPI devices after execution of _WAK in pm->finish.

Alex.