linux-kernel - Re: broken suspend in .2.6.25-rc3 on T61p (was Re: new regression in 2.6.25-rc3: no keyboard/lid acpi events on thinkpad T61p)

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Message-ID: <20080225222023.GK2659@elf.ucw.cz>
Date:	Mon, 25 Feb 2008 23:20:23 +0100
From:	Pavel Machek <pavel@....cz>
To:	"Michael S. Tsirkin" <m.s.tsirkin@...il.com>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Alexey Starikovskiy <astarikovskiy@...e.de>,
	Len Brown <len.brown@...el.com>, linux-acpi@...r.kernel.org,
	Jeff Garzik <jeff@...zik.org>
Subject: Re: broken suspend in .2.6.25-rc3 on T61p (was Re: new regression
	in 2.6.25-rc3: no keyboard/lid acpi events on thinkpad T61p)

Hi!

> >  > >  > commit 559bbe6cbd0d8c68d40076a5f7dc98e3bf5864b2
> >  > >  > Author: Pavel Machek <pavel@....cz>
> >  > >  > Date:   Thu Feb 21 13:56:55 2008 +0100
> >  > >  >
> >  > >  >     power_state: get rid of write-only variable in SATA
> >  > >
> >  > >  This is pretty unlikely to be it. Can you double check that this patch
> >  > >  really breaks something?
> >  >
> >  > I did and it seems to: just reverting
> >  > 559bbe6cbd0d8c68d40076a5f7dc98e3bf5864b2 fixes resume for me.
> >  > 635adc28087ced0c843d2ecb6d4ae474d0e611cd which is
> >  > 559bbe6cbd0d8c68d40076a5f7dc98e3bf5864b2~1
> >  > also resumes fine.
> >
> >  Hmm, I guess that should teach me about "simple cleanups".
> >
> >  Do you use any of:
> >
> >  ata/sata_inic162x.c
> >  ata/sata_nv.c
> >  ata/sata_sil24.c
> >
> >  by chance?
> 
> I don't think so.
> Here are the only 3 ata modules I have built:
> drivers/ata/ahci.ko
> drivers/ata/ata_piix.ko
> drivers/ata/libata.ko
> 
> 
> ahci.c seems to look at power_state.
> 
> static int ahci_pci_device_resume(struct pci_dev *pdev)
> {
>         struct ata_host *host = dev_get_drvdata(&pdev->dev);
>         int rc;
> 
>         rc = ata_pci_device_do_resume(pdev);
>         if (rc)
>                 return rc;
> 
>         if (pdev->dev.power.power_state.event == PM_EVENT_SUSPEND) {
>                 rc = ahci_reset_controller(host);
>                 if (rc)
>                         return rc;
> 
>                 ahci_init_controller(host);
>         }

> Right?

Hmm, mystery partly solved... as you guessed it, this piece of code
was not in my tree.

(still, how can this cause autoresume after 5 seconds is a mystery to
me).
								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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