Re: pcim_enable_device BUGs for libata devices in 2.6.20-git6

[Tejun Heo <htejun@gmail.com>]

Hello, Pavel.

Pavel Machek wrote:
> > 1. Don't restore power state and re-enable PCI device on resume from 
> > freeze just as we don't do the opposite when freezing.
> >
> > 2. Unconditionally disable and power down PCI device on suspend whether 
> > it's freeze or not.
> >
> > #2 would be simpler but I'm a bit worried about it.  There might be 
> > controllers which choke after such sequence (save state, disable, power 
> > down, no actual power removal, power on, restore state, re-enable).
>
> I'd just go for #2.

I think I've been seeing too many weird ATA controller issues to be bold 
about this.  I'll chicken out and go for #1.  :-)

> > #1 can be easily done by taking a look at the current device power state 
> > (gendev->power.power_state).  The problem is that no one in 
> > suspend/resume path seems to be setting that variable except for
> > runtime 
>
> No, that variable is probably going to go away. If you want to
> remember that you are resuming from freeze, just store that info in
> private data structure.

I see.  Thanks.

--
tejun
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