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-rw-r--r--include/linux/serio.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/serio.h b/include/linux/serio.h
index 3a697cc6ecae..b99c5ca9708d 100644
--- a/include/linux/serio.h
+++ b/include/linux/serio.h
@@ -41,6 +41,7 @@ struct serio {
void (*stop)(struct serio *);
struct serio *parent, *child;
+ unsigned int depth; /* level of nesting in serio hierarchy */
struct serio_driver *drv; /* accessed from interrupt, must be protected by serio->lock and serio->sem */
struct mutex drv_mutex; /* protects serio->drv so attributes can pin driver */