1 files changed, 49 insertions, 4 deletions

diff --git a/drivers/acpi/utils.c b/drivers/acpi/utils.c
index adbbc1c80a2..462f7e30036 100644
--- a/drivers/acpi/utils.c
+++ b/drivers/acpi/utils.c
@@ -384,7 +384,7 @@ acpi_evaluate_reference(acpi_handle handle,
 EXPORT_SYMBOL(acpi_evaluate_reference);
 
 acpi_status
-acpi_get_physical_device_location(acpi_handle handle, struct acpi_pld *pld)
+acpi_get_physical_device_location(acpi_handle handle, struct acpi_pld_info **pld)
 {
 	acpi_status status;
 	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
@@ -400,15 +400,60 @@ acpi_get_physical_device_location(acpi_handle handle, struct acpi_pld *pld)
 	if (!output || output->type != ACPI_TYPE_PACKAGE
 	    || !output->package.count
 	    || output->package.elements[0].type != ACPI_TYPE_BUFFER
-	    || output->package.elements[0].buffer.length > sizeof(*pld)) {
+	    || output->package.elements[0].buffer.length < ACPI_PLD_REV1_BUFFER_SIZE) {
 		status = AE_TYPE;
 		goto out;
 	}
 
-	memcpy(pld, output->package.elements[0].buffer.pointer,
-	       output->package.elements[0].buffer.length);
+	status = acpi_decode_pld_buffer(
+			output->package.elements[0].buffer.pointer,
+			output->package.elements[0].buffer.length,
+			pld);
+
 out:
 	kfree(buffer.pointer);
 	return status;
 }
 EXPORT_SYMBOL(acpi_get_physical_device_location);
+
+/**
+ * acpi_evaluate_hotplug_ost: Evaluate _OST for hotplug operations
+ * @handle: ACPI device handle
+ * @source_event: source event code
+ * @status_code: status code
+ * @status_buf: optional detailed information (NULL if none)
+ *
+ * Evaluate _OST for hotplug operations. All ACPI hotplug handlers
+ * must call this function when evaluating _OST for hotplug operations.
+ * When the platform does not support _OST, this function has no effect.
+ */
+acpi_status
+acpi_evaluate_hotplug_ost(acpi_handle handle, u32 source_event,
+		u32 status_code, struct acpi_buffer *status_buf)
+{
+#ifdef ACPI_HOTPLUG_OST
+	union acpi_object params[3] = {
+		{.type = ACPI_TYPE_INTEGER,},
+		{.type = ACPI_TYPE_INTEGER,},
+		{.type = ACPI_TYPE_BUFFER,}
+	};
+	struct acpi_object_list arg_list = {3, params};
+	acpi_status status;
+
+	params[0].integer.value = source_event;
+	params[1].integer.value = status_code;
+	if (status_buf != NULL) {
+		params[2].buffer.pointer = status_buf->pointer;
+		params[2].buffer.length = status_buf->length;
+	} else {
+		params[2].buffer.pointer = NULL;
+		params[2].buffer.length = 0;
+	}
+
+	status = acpi_evaluate_object(handle, "_OST", &arg_list, NULL);
+	return status;
+#else
+	return AE_OK;
+#endif
+}
+EXPORT_SYMBOL(acpi_evaluate_hotplug_ost);