diff --git a/drivers/rapidio/devices/rio_mport_cdev.c b/drivers/rapidio/devices/rio_mport_cdev.c
index ad82c2108a56..47ba34b4afb2 100644
--- a/drivers/rapidio/devices/rio_mport_cdev.c
+++ b/drivers/rapidio/devices/rio_mport_cdev.c
@@ -2167,11 +2167,12 @@ static void mport_mm_open(struct vm_area_struct *vma)
 static void mport_mm_close(struct vm_area_struct *vma)
 {
 	struct rio_mport_mapping *map = vma->vm_private_data;
+	struct mport_dev *md = map->md;
 
 	rmcd_debug(MMAP, "%pad", &map->phys_addr);
-	mutex_lock(&map->md->buf_mutex);
+	mutex_lock(&md->buf_mutex);
 	kref_put(&map->ref, mport_release_mapping);
-	mutex_unlock(&map->md->buf_mutex);
+	mutex_unlock(&md->buf_mutex);
 }
 
 static const struct vm_operations_struct vm_ops = {