openwrt-xburst/target/linux/generic/patches-2.6.32/310-usb-add-usb_find_device_by_name.patch

--- a/drivers/usb/core/usb.c
+++ b/drivers/usb/core/usb.c
@@ -651,6 +651,71 @@ exit:
 	return dev;
 }
 
+static struct usb_device *match_device_name(struct usb_device *dev,
+					    const char *name)
+{
+	struct usb_device *ret_dev = NULL;
+	int child;
+
+	dev_dbg(&dev->dev, "check for name %s ...\n", name);
+
+	/* see if this device matches */
+	if (strcmp(dev_name(&dev->dev), name) == 0 ) {
+		dev_dbg(&dev->dev, "matched this device!\n");
+		ret_dev = usb_get_dev(dev);
+		goto exit;
+	}
+
+	/* look through all of the children of this device */
+	for (child = 0; child < dev->maxchild; ++child) {
+		if (dev->children[child]) {
+			usb_lock_device(dev->children[child]);
+			ret_dev = match_device_name(dev->children[child], name);
+			usb_unlock_device(dev->children[child]);
+			if (ret_dev)
+				goto exit;
+		}
+	}
+exit:
+	return ret_dev;
+}
+
+/**
+ * usb_find_device_by_name - find a specific usb device in the system
+ * @name: the name of the device to find
+ *
+ * Returns a pointer to a struct usb_device if such a specified usb
+ * device is present in the system currently.  The usage count of the
+ * device will be incremented if a device is found.  Make sure to call
+ * usb_put_dev() when the caller is finished with the device.
+ *
+ * If a device with the specified bus id is not found, NULL is returned.
+ */
+struct usb_device *usb_find_device_by_name(const char *name)
+{
+	struct list_head *buslist;
+	struct usb_bus *bus;
+	struct usb_device *dev = NULL;
+
+	mutex_lock(&usb_bus_list_lock);
+	for (buslist = usb_bus_list.next;
+	     buslist != &usb_bus_list;
+	     buslist = buslist->next) {
+		bus = container_of(buslist, struct usb_bus, bus_list);
+		if (!bus->root_hub)
+			continue;
+		usb_lock_device(bus->root_hub);
+		dev = match_device_name(bus->root_hub, name);
+		usb_unlock_device(bus->root_hub);
+		if (dev)
+			goto exit;
+	}
+exit:
+	mutex_unlock(&usb_bus_list_lock);
+	return dev;
+}
+EXPORT_SYMBOL_GPL(usb_find_device_by_name);
+
 /**
  * usb_get_current_frame_number - return current bus frame number
  * @dev: the device whose bus is being queried
--- a/include/linux/usb.h
+++ b/include/linux/usb.h
@@ -540,6 +540,7 @@ extern int usb_reset_device(struct usb_d
 extern void usb_queue_reset_device(struct usb_interface *dev);
 
 extern struct usb_device *usb_find_device(u16 vendor_id, u16 product_id);
+extern struct usb_device *usb_find_device_by_name(const char *name);
 
 /* USB autosuspend and autoresume */
 #ifdef CONFIG_USB_SUSPEND