ACPI: acpi_pci_set_power_state() cleanups

Minor cleanups to acpi_pci_set_power_state():  use the ACPI and PCI
state symbols to make clear that a mapping is being done between PCI
and ACPI states, instead of using magic numbers.  For paranoia's sake,
report any errors.  Save five bytes (x86_64) too.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 16 insertions, 8 deletions

diff --git a/drivers/pci/pci-acpi.c b/drivers/pci/pci-acpi.c
index 4a23654184f..72f7476930c 100644
--- a/drivers/pci/pci-acpi.c
+++ b/drivers/pci/pci-acpi.c
@@ -272,21 +272,29 @@ static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state)
 {
         acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
         acpi_handle tmp;
-        static int state_conv[] = {
-                [0] = 0,
-                [1] = 1,
-                [2] = 2,
-                [3] = 3,
-                [4] = 3
+        static const u8 state_conv[] = {
+                [PCI_D0] = ACPI_STATE_D0,
+                [PCI_D1] = ACPI_STATE_D1,
+                [PCI_D2] = ACPI_STATE_D2,
+                [PCI_D3hot] = ACPI_STATE_D3,
+                [PCI_D3cold] = ACPI_STATE_D3
         };
-        int acpi_state = state_conv[(int __force) state];
 
         if (!handle)
                 return -ENODEV;
         /* If the ACPI device has _EJ0, ignore the device */
         if (ACPI_SUCCESS(acpi_get_handle(handle, "_EJ0", &tmp)))
                 return 0;
-        return acpi_bus_set_power(handle, acpi_state);
+
+        switch (state) {
+        case PCI_D0:
+        case PCI_D1:
+        case PCI_D2:
+        case PCI_D3hot:
+        case PCI_D3cold:
+                return acpi_bus_set_power(handle, state_conv[state]);
+        }
+        return -EINVAL;
 }