diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
index 799518b3cdc526f92aa2635a08e2f438bfe75e47..60553c156f904da0c5093b037594d930bb5580ff 100644
--- a/drivers/hv/vmbus_drv.c
+++ b/drivers/hv/vmbus_drv.c
@@ -1187,6 +1187,21 @@ int vmbus_allocate_mmio(struct resource **new, struct hv_device *device_obj,
 }
 EXPORT_SYMBOL_GPL(vmbus_allocate_mmio);
 
+/**
+ * vmbus_free_mmio() - Free a memory-mapped I/O range.
+ * @start:		Base address of region to release.
+ * @size:		Size of the range to be allocated
+ *
+ * This function releases anything requested by
+ * vmbus_mmio_allocate().
+ */
+void vmbus_free_mmio(resource_size_t start, resource_size_t size)
+{
+	release_mem_region(start, size);
+
+}
+EXPORT_SYMBOL_GPL(vmbus_free_mmio);
+
 /**
  * vmbus_cpu_number_to_vp_number() - Map CPU to VP.
  * @cpu_number: CPU number in Linux terms
diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h
index 590fee6a2e6f3cdc09ccf5c604fc6dd2c5b3006b..b10954a66939248942021f4c8917895fe9dd098f 100644
--- a/include/linux/hyperv.h
+++ b/include/linux/hyperv.h
@@ -1120,7 +1120,7 @@ int vmbus_allocate_mmio(struct resource **new, struct hv_device *device_obj,
 			resource_size_t min, resource_size_t max,
 			resource_size_t size, resource_size_t align,
 			bool fb_overlap_ok);
-
+void vmbus_free_mmio(resource_size_t start, resource_size_t size);
 int vmbus_cpu_number_to_vp_number(int cpu_number);
 u64 hv_do_hypercall(u64 control, void *input, void *output);