1 files changed, 5 insertions, 1 deletions

diff --git a/drivers/input/serio/serio.c b/drivers/input/serio/serio.c
index 960fae3c3cea..480fdc5d20b3 100644
--- a/drivers/input/serio/serio.c
+++ b/drivers/input/serio/serio.c
@@ -538,8 +538,12 @@ static void serio_init_port(struct serio *serio)
                  "serio%ld", (long)atomic_inc_return(&serio_no) - 1);
         serio->dev.bus = &serio_bus;
         serio->dev.release = serio_release_port;
-        if (serio->parent)
+        if (serio->parent) {
                 serio->dev.parent = &serio->parent->dev;
+                serio->depth = serio->parent->depth + 1;
+        } else
+                serio->depth = 0;
+        lockdep_set_subclass(&serio->lock, serio->depth);
 }
 
 /*