diff --git a/drivers/acpi/acpica/evgpeinit.c b/drivers/acpi/acpica/evgpeinit.c
index 2c7def95f721c6d08596c9ce852a3ac4a1c54e38..4c8dea513b66adeea7881d7f541237c812e5bf14 100644
--- a/drivers/acpi/acpica/evgpeinit.c
+++ b/drivers/acpi/acpica/evgpeinit.c
@@ -408,6 +408,9 @@ acpi_ev_match_gpe_method(acpi_handle obj_handle,
 		return_ACPI_STATUS(AE_OK);
 	}
 
+	/* Disable the GPE in case it's been enabled already. */
+	(void)acpi_hw_low_set_gpe(gpe_event_info, ACPI_GPE_DISABLE);
+
 	/*
 	 * Add the GPE information from above to the gpe_event_info block for
 	 * use during dispatch of this GPE.
diff --git a/drivers/acpi/battery.c b/drivers/acpi/battery.c
index 9fb9d5ac939db1c071c4cdcaa7fba49364236e25..95649d373071ac93d14bbbb478db1ab4a8cdb801 100644
--- a/drivers/acpi/battery.c
+++ b/drivers/acpi/battery.c
@@ -130,8 +130,6 @@ struct acpi_battery {
 	unsigned long flags;
 };
 
-static int acpi_battery_update(struct acpi_battery *battery);
-
 #define to_acpi_battery(x) container_of(x, struct acpi_battery, bat);
 
 inline int acpi_battery_present(struct acpi_battery *battery)
@@ -186,9 +184,6 @@ static int acpi_battery_get_property(struct power_supply *psy,
 	int ret = 0;
 	struct acpi_battery *battery = to_acpi_battery(psy);
 
-	if (acpi_battery_update(battery))
-		return -ENODEV;
-
 	if (acpi_battery_present(battery)) {
 		/* run battery update only if it is present */
 		acpi_battery_get_state(battery);
diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index 2b6c21d86b9885571b41679586636fff3b6c53bb..29ef505c487b92efe1b12e79c2231aa85c0298ce 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -705,54 +705,85 @@ static int acpi_bus_get_perf_flags(struct acpi_device *device)
 }
 
 static acpi_status
-acpi_bus_extract_wakeup_device_power_package(struct acpi_device *device,
-					     union acpi_object *package)
+acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
+					     struct acpi_device_wakeup *wakeup)
 {
-	int i = 0;
+	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
+	union acpi_object *package = NULL;
 	union acpi_object *element = NULL;
+	acpi_status status;
+	int i = 0;
 
-	if (!device || !package || (package->package.count < 2))
+	if (!wakeup)
 		return AE_BAD_PARAMETER;
 
+	/* _PRW */
+	status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
+	if (ACPI_FAILURE(status)) {
+		ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
+		return status;
+	}
+
+	package = (union acpi_object *)buffer.pointer;
+
+	if (!package || (package->package.count < 2)) {
+		status = AE_BAD_DATA;
+		goto out;
+	}
+
 	element = &(package->package.elements[0]);
-	if (!element)
-		return AE_BAD_PARAMETER;
+	if (!element) {
+		status = AE_BAD_DATA;
+		goto out;
+	}
 	if (element->type == ACPI_TYPE_PACKAGE) {
 		if ((element->package.count < 2) ||
 		    (element->package.elements[0].type !=
 		     ACPI_TYPE_LOCAL_REFERENCE)
-		    || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
-			return AE_BAD_DATA;
-		device->wakeup.gpe_device =
+		    || (element->package.elements[1].type != ACPI_TYPE_INTEGER)) {
+			status = AE_BAD_DATA;
+			goto out;
+		}
+		wakeup->gpe_device =
 		    element->package.elements[0].reference.handle;
-		device->wakeup.gpe_number =
+		wakeup->gpe_number =
 		    (u32) element->package.elements[1].integer.value;
 	} else if (element->type == ACPI_TYPE_INTEGER) {
-		device->wakeup.gpe_number = element->integer.value;
-	} else
-		return AE_BAD_DATA;
+		wakeup->gpe_device = NULL;
+		wakeup->gpe_number = element->integer.value;
+	} else {
+		status = AE_BAD_DATA;
+		goto out;
+	}
 
 	element = &(package->package.elements[1]);
 	if (element->type != ACPI_TYPE_INTEGER) {
-		return AE_BAD_DATA;
+		status = AE_BAD_DATA;
+		goto out;
 	}
-	device->wakeup.sleep_state = element->integer.value;
+	wakeup->sleep_state = element->integer.value;
 
 	if ((package->package.count - 2) > ACPI_MAX_HANDLES) {
-		return AE_NO_MEMORY;
+		status = AE_NO_MEMORY;
+		goto out;
 	}
-	device->wakeup.resources.count = package->package.count - 2;
-	for (i = 0; i < device->wakeup.resources.count; i++) {
+	wakeup->resources.count = package->package.count - 2;
+	for (i = 0; i < wakeup->resources.count; i++) {
 		element = &(package->package.elements[i + 2]);
-		if (element->type != ACPI_TYPE_LOCAL_REFERENCE)
-			return AE_BAD_DATA;
+		if (element->type != ACPI_TYPE_LOCAL_REFERENCE) {
+			status = AE_BAD_DATA;
+			goto out;
+		}
 
-		device->wakeup.resources.handles[i] = element->reference.handle;
+		wakeup->resources.handles[i] = element->reference.handle;
 	}
 
-	acpi_gpe_can_wake(device->wakeup.gpe_device, device->wakeup.gpe_number);
+	acpi_gpe_can_wake(wakeup->gpe_device, wakeup->gpe_number);
 
-	return AE_OK;
+ out:
+	kfree(buffer.pointer);
+
+	return status;
 }
 
 static void acpi_bus_set_run_wake_flags(struct acpi_device *device)
@@ -787,26 +818,15 @@ static void acpi_bus_set_run_wake_flags(struct acpi_device *device)
 static int acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
 {
 	acpi_status status = 0;
-	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
-	union acpi_object *package = NULL;
 	int psw_error;
 
-	/* _PRW */
-	status = acpi_evaluate_object(device->handle, "_PRW", NULL, &buffer);
-	if (ACPI_FAILURE(status)) {
-		ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
-		goto end;
-	}
-
-	package = (union acpi_object *)buffer.pointer;
-	status = acpi_bus_extract_wakeup_device_power_package(device, package);
+	status = acpi_bus_extract_wakeup_device_power_package(device->handle,
+							      &device->wakeup);
 	if (ACPI_FAILURE(status)) {
 		ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package"));
 		goto end;
 	}
 
-	kfree(buffer.pointer);
-
 	device->wakeup.flags.valid = 1;
 	device->wakeup.prepare_count = 0;
 	acpi_bus_set_run_wake_flags(device);
@@ -1351,6 +1371,7 @@ static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl,
 	struct acpi_bus_ops *ops = context;
 	int type;
 	unsigned long long sta;
+	struct acpi_device_wakeup wakeup;
 	struct acpi_device *device;
 	acpi_status status;
 	int result;
@@ -1360,8 +1381,10 @@ static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl,
 		return AE_OK;
 
 	if (!(sta & ACPI_STA_DEVICE_PRESENT) &&
-	    !(sta & ACPI_STA_DEVICE_FUNCTIONING))
+	    !(sta & ACPI_STA_DEVICE_FUNCTIONING)) {
+		acpi_bus_extract_wakeup_device_power_package(handle, &wakeup);
 		return AE_CTRL_DEPTH;
+	}
 
 	/*
 	 * We may already have an acpi_device from a previous enumeration.  If