1 files changed, 9 insertions, 2 deletions

diff --git a/include/linux/usb/composite.h b/include/linux/usb/composite.h
index c932390c6da0..935c380ffe47 100644
--- a/include/linux/usb/composite.h
+++ b/include/linux/usb/composite.h
@@ -130,6 +130,9 @@ struct usb_function {
 
 int usb_add_function(struct usb_configuration *, struct usb_function *);
 
+int usb_function_deactivate(struct usb_function *);
+int usb_function_activate(struct usb_function *);
+
 int usb_interface_id(struct usb_configuration *, struct usb_function *);
 
 /**
@@ -316,9 +319,13 @@ struct usb_composite_dev {
         struct usb_composite_driver     *driver;
         u8                              next_string_id;
 
-        spinlock_t                      lock;
+        /* the gadget driver won't enable the data pullup
+         * while the deactivation count is nonzero.
+         */
+        unsigned                        deactivations;
 
-        /* REVISIT use and existence of lock ... */
+        /* protects at least deactivation count */
+        spinlock_t                      lock;
 };
 
 extern int usb_string_id(struct usb_composite_dev *c);