Re: PCI PM: Restore standard config registers of all devices early

[Pavel Machek <pavel@suse.cz>]

Hi!

> > I'll have a look at the ACPI thing.
> 
> Generally speaking, we'd need to run acpi_evaluate_object() with interrupts
> off.
> 
> There are two apparent problems with that, from a quick look:
> 
> * The ACPI_MTX_INTERPRETER mutex needs to be acquired, but we know we won't
>   need that mutex with interrupts off, so presumably we can work around this.

In such case we either need refrigerator, or we should grab
MTX_INTERPRETER before we start suspending, hmm.

> * Memory allocations with GFP_KERNEL are made, which is even worse, because
>   we really shouldn't do that during suspend _at_ _all_, even during the regular
>   ->suspend() with interrupts on, because there's not guarantee that swap will
>   will be available at that time.  So, for the sake of correctness, we should
>   get rid of the GFP_KERNEL from the ACPI code paths executed during
>   suspend-resume anyway.

Well, we have some small reserves for stuff like that...
								Pavel
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