[Resend] PCI / PM: Fix messages printed by acpi_pci_set_power_state()

If a PCI device is put into D3_cold by acpi_bus_set_power(),
the message printed by acpi_pci_set_power_state() says that its
power state has been changed to D4, which doesn't make sense.
In turn, if the device is put into D3_hot, the message simply
says "D3" without specifying the variant of the D3 state.

Fix this by using the pci_power_name() macro for printing the state
name instead of building it from the numeric value corresponding to
the given state directly.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
---
 drivers/pci/pci-acpi.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

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On Sat, Aug 4, 2012 at 3:27 PM, Rafael J. Wysocki <rjw@sisk.pl> wrote:
>
> If a PCI device is put into D3_cold by acpi_bus_set_power(),
> the message printed by acpi_pci_set_power_state() says that its
> power state has been changed to D4, which doesn't make sense.
> In turn, if the device is put into D3_hot, the message simply
> says "D3" without specifying the variant of the D3 state.
>
> Fix this by using the pci_power_name() macro for printing the state
> name instead of building it from the numeric value corresponding to
> the given state directly.
>
> Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>

Applied to my for-linus branch, since this fixes a minor issue
introduced with the runtime D3cold support we merged for 3.6.  Thanks!

> ---
>  drivers/pci/pci-acpi.c |    4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> Index: linux/drivers/pci/pci-acpi.c
> ===================================================================
> --- linux.orig/drivers/pci/pci-acpi.c
> +++ linux/drivers/pci/pci-acpi.c
> @@ -266,8 +266,8 @@ static int acpi_pci_set_power_state(stru
>         }
>
>         if (!error)
> -               dev_printk(KERN_INFO, &dev->dev,
> -                               "power state changed by ACPI to D%d\n", state);
> +               dev_info(&dev->dev, "power state changed by ACPI to %s\n",
> +                        pci_power_name(state));
>
>         return error;
>  }
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