On Wed, 25 Jul 2012, Rafael J. Wysocki 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 says just
> "D3" without specifying which variant of D3 it is.
>
> Fix that by using an array of state names corresponding to the
> PCI device power states instead of building the state name from
> the numeric value corresponding to the given state directly.
>
> Signed-off-by: Rafael J. Wysocki <rjw@xxxxxxx>
> ---
> drivers/pci/pci-acpi.c | 14 +++++++++++---
> 1 file changed, 11 insertions(+), 3 deletions(-)
>
> Index: linux/drivers/pci/pci-acpi.c
> ===================================================================
> --- linux.orig/drivers/pci/pci-acpi.c
> +++ linux/drivers/pci/pci-acpi.c
> @@ -265,9 +265,17 @@ static int acpi_pci_set_power_state(stru
> error = acpi_bus_set_power(handle, state_conv[state]);
> }
>
> - if (!error)
> - dev_printk(KERN_INFO, &dev->dev,
> - "power state changed by ACPI to D%d\n", state);
> + if (!error) {
> + static const char *state_name[] = {
> + [PCI_D0] = "D0",
> + [PCI_D1] = "D1",
> + [PCI_D2] = "D2",
> + [PCI_D3hot] = "D3hot",
> + [PCI_D3cold] = "D3cold"
> + };
> + dev_info(&dev->dev, "power state changed by ACPI to %s\n",
> + state_name[state]);
> + }
How about using the pci_power_name macro defined in
include/linux/pci.h instead?
Alan Stern
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