1 files changed, 3 insertions, 0 deletions

diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
index 16c3c441256..9cfd5b1a48e 100644
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -303,6 +303,9 @@ struct acpi_device {
 #define to_acpi_device(d)       container_of(d, struct acpi_device, dev)
 #define to_acpi_driver(d)       container_of(d, struct acpi_driver, drv)
 
+/* acpi_device.dev.bus == &acpi_bus_type */
+extern struct bus_type acpi_bus_type;
+
 /*
  * Events
  * ------