diff --git a/include/linux/pm.h b/include/linux/pm.h
index 9c16cd2..e80df06 100644
--- a/include/linux/pm.h
+++ b/include/linux/pm.h
@@ -512,6 +512,7 @@
 		__suspend_report_result(__func__, fn, ret);		\
 	} while (0)
 
+extern void device_pm_wait_for_dev(struct device *sub, struct device *dev);
 #else /* !CONFIG_PM_SLEEP */
 
 #define device_pm_lock() do {} while (0)
@@ -524,6 +525,7 @@
 
 #define suspend_report_result(fn, ret)		do {} while (0)
 
+static inline void device_pm_wait_for_dev(struct device *a, struct device *b) {}
 #endif /* !CONFIG_PM_SLEEP */
 
 /* How to reorder dpm_list after device_move() */