linux-kernel - Re: [PATCH RESEND] ACPI/PCI: Make PCI devices notified when its power resource turned on

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Date:	Tue, 06 Nov 2012 08:33:11 +0800
From:	Huang Ying <ying.huang@...el.com>
To:	Bjorn Helgaas <bhelgaas@...gle.com>
Cc:	Len Brown <lenb@...nel.org>, linux-kernel@...r.kernel.org,
	"Rafael J. Wysocki" <rjw@...k.pl>, linux-acpi@...r.kernel.org,
	linux-pm@...r.kernel.org, linux-pci@...r.kernel.org
Subject: Re: [PATCH RESEND] ACPI/PCI: Make PCI devices notified when its
 power resource turned on

On Mon, 2012-11-05 at 17:02 -0700, Bjorn Helgaas wrote:
> On Wed, Sep 26, 2012 at 7:59 AM, Huang Ying <ying.huang@...el.com> wrote:
> > Sorry for bothering.  It appears that this patch should go through ACPI
> > tree because code changed are under drivers/acpi.
> >
> > A set of power resources may be shared by multiple devices.  When all
> > devices share one set of power resources is put into D3_COLD state,
> > the power resources will be turned off.  When one of the device is
> > waked, the power resource will be turned on and all devices share it
> > will be powered on to D0uninitialized state.  These devices should be
> > resumed, so that they can get opportunity to go to low power state
> > later.
> >
> > Signed-off-by: Huang Ying <ying.huang@...el.com>
> > Acked-by: Rafael J. Wysocki <rjw@...k.pl>
> > Cc: Bjorn Helgaas <bhelgaas@...gle.com>
> 
> I had applied this to my for-linus branch, headed for v3.7, but had to
> drop it because it introduced these warnings:
> 
> drivers/acpi/pci_bind.c: In function 'acpi_pci_unbind':
> drivers/acpi/pci_bind.c:48:2: warning: passing argument 1 of
> 'acpi_power_resource_unregister_device' from incompatible pointer type
> [enabled by default]
> include/acpi/acpi_bus.h:346:6: note: expected 'struct device *' but
> argument is of type 'struct pci_dev *'
> drivers/acpi/pci_bind.c: In function 'acpi_pci_bind':
> drivers/acpi/pci_bind.c:75:2: warning: passing argument 1 of
> 'acpi_power_resource_register_device' from incompatible pointer type
> [enabled by default]
> include/acpi/acpi_bus.h:345:5: note: expected 'struct device *' but
> argument is of type 'struct pci_dev *'
> 
> Apparently this wasn't tested :-(

It's my fault.  I apologize for that.  It appear that I turn a RFC to
PATCH without testing.  Will be more careful for next time.

Best Regards,
Huang Ying

> > ---
> >  drivers/acpi/pci_bind.c |    2 ++
> >  1 file changed, 2 insertions(+)
> >
> > --- a/drivers/acpi/pci_bind.c
> > +++ b/drivers/acpi/pci_bind.c
> > @@ -45,6 +45,7 @@ static int acpi_pci_unbind(struct acpi_d
> >
> >         device_set_run_wake(&dev->dev, false);
> >         pci_acpi_remove_pm_notifier(device);
> > +       acpi_power_resource_unregister_device(dev, device->handle);
> >
> >         if (!dev->subordinate)
> >                 goto out;
> > @@ -71,6 +72,7 @@ static int acpi_pci_bind(struct acpi_dev
> >                 return 0;
> >
> >         pci_acpi_add_pm_notifier(device, dev);
> > +       acpi_power_resource_register_device(dev, device->handle);
> >         if (device->wakeup.flags.run_wake)
> >                 device_set_run_wake(&dev->dev, true);
> >


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