diff --git a/sys/dev/acpica/acpi.c b/sys/dev/acpica/acpi.c
--- a/sys/dev/acpica/acpi.c
+++ b/sys/dev/acpica/acpi.c
@@ -156,7 +156,7 @@
 		    void *context, void **retval);
 static ACPI_STATUS acpi_device_scan_children(device_t bus, device_t dev,
 		    int max_depth, acpi_scan_cb_t user_fn, void *arg);
-static ACPI_STATUS acpi_find_dsd(device_t bus, device_t dev);
+static ACPI_STATUS acpi_find_dsd(struct acpi_device *ad);
 static int	acpi_isa_pnp_probe(device_t bus, device_t child,
 		    struct isa_pnp_id *ids);
 static void	acpi_platform_osc(device_t dev);
@@ -1864,7 +1864,7 @@
 		return (AE_BAD_PARAMETER);
 	if (ad->dsd_pkg == NULL) {
 		if (ad->dsd.Pointer == NULL) {
-			status = acpi_find_dsd(bus, dev);
+			status = acpi_find_dsd(ad);
 			if (ACPI_FAILURE(status))
 				return (status);
 		} else {
@@ -1893,18 +1893,16 @@
 }
 
 static ACPI_STATUS
-acpi_find_dsd(device_t bus, device_t dev)
+acpi_find_dsd(struct acpi_device *ad)
 {
 	const ACPI_OBJECT *dsd, *guid, *pkg;
-	struct acpi_device *ad;
 	ACPI_STATUS status;
 
-	ad = device_get_ivars(dev);
 	ad->dsd.Length = ACPI_ALLOCATE_BUFFER;
 	ad->dsd.Pointer = NULL;
 	ad->dsd_pkg = NULL;
 
-	status = ACPI_EVALUATE_OBJECT(bus, dev, "_DSD", NULL, &ad->dsd);
+	status = AcpiEvaluateObject(ad->ad_handle, "_DSD", NULL, &ad->dsd);
 	if (ACPI_FAILURE(status))
 		return (status);