From 622d3e6b0db6e4c6fc97a7e02627148176674d76 Mon Sep 17 00:00:00 2001
From: Greg Kroah-Hartman <greg@kroah.com>
Date: Tue, 30 Mar 2004 22:17:38 -0800
Subject: [PATCH] USB: add usb_get_intf() and usb_put_intf() functions as they
 will be needed.

---
 drivers/usb/core/usb.c | 36 +++++++++++++++++++++++++++++++++++-
 include/linux/usb.h    |  3 +++
 2 files changed, 38 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/core/usb.c b/drivers/usb/core/usb.c
index 11d5c1b94fcea..0da70f7af71da 100644
--- a/drivers/usb/core/usb.c
+++ b/drivers/usb/core/usb.c
@@ -768,7 +768,7 @@ usb_alloc_dev(struct usb_device *parent, struct usb_bus *bus, unsigned port)
  *
  * A pointer to the device with the incremented reference counter is returned.
  */
-struct usb_device *usb_get_dev (struct usb_device *dev)
+struct usb_device *usb_get_dev(struct usb_device *dev)
 {
 	if (dev)
 		get_device(&dev->dev);
@@ -788,6 +788,40 @@ void usb_put_dev(struct usb_device *dev)
 		put_device(&dev->dev);
 }
 
+/**
+ * usb_get_intf - increments the reference count of the usb interface structure
+ * @intf: the interface being referenced
+ *
+ * Each live reference to a interface must be refcounted.
+ *
+ * Drivers for USB interfaces should normally record such references in
+ * their probe() methods, when they bind to an interface, and release
+ * them by calling usb_put_intf(), in their disconnect() methods.
+ *
+ * A pointer to the interface with the incremented reference counter is
+ * returned.
+ */
+struct usb_interface *usb_get_intf(struct usb_interface *intf)
+{
+	if (intf)
+		get_device(&intf->dev);
+	return intf;
+}
+
+/**
+ * usb_put_intf - release a use of the usb interface structure
+ * @intf: interface that's been decremented
+ *
+ * Must be called when a user of an interface is finished with it.  When the
+ * last user of the interface calls this function, the memory of the interface
+ * is freed.
+ */
+void usb_put_intf(struct usb_interface *intf)
+{
+	if (intf)
+		put_device(&intf->dev);
+}
+
 static struct usb_device *match_device(struct usb_device *dev,
 				       u16 vendor_id, u16 product_id)
 {
diff --git a/include/linux/usb.h b/include/linux/usb.h
index 47a4e5c82af4d..608e3a2973401 100644
--- a/include/linux/usb.h
+++ b/include/linux/usb.h
@@ -140,6 +140,9 @@ static inline void usb_set_intfdata (struct usb_interface *intf, void *data)
 	dev_set_drvdata(&intf->dev, data);
 }
 
+struct usb_interface *usb_get_intf(struct usb_interface *intf);
+void usb_put_intf(struct usb_interface *intf);
+
 /* this maximum is arbitrary */
 #define USB_MAXINTERFACES	32
 
-- 
2.53.0