ACPI / scan: Move power state initialization to a separate routine

To reduce indentation level and improve code readability, move the
initialization code related to device power states from
acpi_bus_get_power_flags() to a new routine,
acpi_bus_init_power_state().
Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/acpi/scan.c

@@ -1041,44 +1041,18 @@ static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
 				"error in _DSW or _PSW evaluation\n"));
 }
 
-static void acpi_bus_get_power_flags(struct acpi_device *device)
+static void acpi_bus_init_power_state(struct acpi_device *device, int state)
 {
-	acpi_status status = 0;
-	acpi_handle handle = NULL;
-	u32 i = 0;
-
-	/* Presence of _PS0|_PR0 indicates 'power manageable' */
-	status = acpi_get_handle(device->handle, "_PS0", &handle);
-	if (ACPI_FAILURE(status)) {
-		status = acpi_get_handle(device->handle, "_PR0", &handle);
-		if (ACPI_FAILURE(status))
-			return;
-	}
-
-	device->flags.power_manageable = 1;
-
-	/*
-	 * Power Management Flags
-	 */
-	status = acpi_get_handle(device->handle, "_PSC", &handle);
-	if (ACPI_SUCCESS(status))
-		device->power.flags.explicit_get = 1;
-	status = acpi_get_handle(device->handle, "_IRC", &handle);
-	if (ACPI_SUCCESS(status))
-		device->power.flags.inrush_current = 1;
-
-	/*
-	 * Enumerate supported power management states
-	 */
-	for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
-		struct acpi_device_power_state *ps = &device->power.states[i];
-		char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };
+	struct acpi_device_power_state *ps = &device->power.states[state];
+	char object_name[5] = { '_', 'P', 'R', '0' + state, '\0' };
 	struct acpi_handle_list resources;
+	acpi_handle handle;
+	acpi_status status;
 
 	INIT_LIST_HEAD(&ps->resources);
+
 	/* Evaluate "_PRx" to se if power resources are referenced */
-		acpi_evaluate_reference(device->handle, object_name, NULL,
-					&resources);
+	acpi_evaluate_reference(device->handle, object_name, NULL, &resources);
 	if (resources.count) {
 		int j;
 
@@ -1087,8 +1061,7 @@ static void acpi_bus_get_power_flags(struct acpi_device *device)
 			acpi_handle rhandle = resources.handles[j];
 
 			acpi_add_power_resource(rhandle);
-				acpi_power_resources_list_add(rhandle,
-							      &ps->resources);
+			acpi_power_resources_list_add(rhandle, &ps->resources);
 		}
 	}
 
@@ -1102,16 +1075,48 @@ static void acpi_bus_get_power_flags(struct acpi_device *device)
 	 * State is valid if there are means to put the device into it.
 	 * D3hot is only valid if _PR3 present.
 	 */
-		if (resources.count ||
-		    (ps->flags.explicit_set && i < ACPI_STATE_D3_HOT)) {
+	if (resources.count
+	    || (ps->flags.explicit_set && state < ACPI_STATE_D3_HOT)) {
 		ps->flags.valid = 1;
 		ps->flags.os_accessible = 1;
 	}
 
 	ps->power = -1;		/* Unknown - driver assigned */
 	ps->latency = -1;	/* Unknown - driver assigned */
+}
+
+static void acpi_bus_get_power_flags(struct acpi_device *device)
+{
+	acpi_status status = 0;
+	acpi_handle handle = NULL;
+	u32 i = 0;
+
+	/* Presence of _PS0|_PR0 indicates 'power manageable' */
+	status = acpi_get_handle(device->handle, "_PS0", &handle);
+	if (ACPI_FAILURE(status)) {
+		status = acpi_get_handle(device->handle, "_PR0", &handle);
+		if (ACPI_FAILURE(status))
+			return;
 	}
 
+	device->flags.power_manageable = 1;
+
+	/*
+	 * Power Management Flags
+	 */
+	status = acpi_get_handle(device->handle, "_PSC", &handle);
+	if (ACPI_SUCCESS(status))
+		device->power.flags.explicit_get = 1;
+	status = acpi_get_handle(device->handle, "_IRC", &handle);
+	if (ACPI_SUCCESS(status))
+		device->power.flags.inrush_current = 1;
+
+	/*
+	 * Enumerate supported power management states
+	 */
+	for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
+		acpi_bus_init_power_state(device, i);
+
 	INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
 
 	/* Set defaults for D0 and D3 states (always valid) */