diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
index 2c79aa6..3dd997d 100644
--- a/drivers/usb/core/hcd.c
+++ b/drivers/usb/core/hcd.c
@@ -1176,6 +1176,7 @@
 	 */
 	usb_get_urb(urb);
 	atomic_inc(&urb->use_count);
+	atomic_inc(&urb->dev->urbnum);
 	usbmon_urb_submit(&hcd->self, urb);
 
 	/* NOTE requirements on root-hub callers (usbfs and the hub
@@ -1197,6 +1198,7 @@
 		urb->hcpriv = NULL;
 		INIT_LIST_HEAD(&urb->urb_list);
 		atomic_dec(&urb->use_count);
+		atomic_dec(&urb->dev->urbnum);
 		if (urb->reject)
 			wake_up(&usb_kill_urb_queue);
 		usb_put_urb(urb);
diff --git a/drivers/usb/core/sysfs.c b/drivers/usb/core/sysfs.c
index e025902..b04afd0 100644
--- a/drivers/usb/core/sysfs.c
+++ b/drivers/usb/core/sysfs.c
@@ -169,6 +169,16 @@
 }
 static DEVICE_ATTR(quirks, S_IRUGO, show_quirks, NULL);
 
+static ssize_t
+show_urbnum(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	struct usb_device *udev;
+
+	udev = to_usb_device(dev);
+	return sprintf(buf, "%d\n", atomic_read(&udev->urbnum));
+}
+static DEVICE_ATTR(urbnum, S_IRUGO, show_urbnum, NULL);
+
 
 #if defined(CONFIG_USB_PERSIST) || defined(CONFIG_USB_SUSPEND)
 static const char power_group[] = "power";
@@ -458,6 +468,7 @@
 	&dev_attr_bConfigurationValue.attr,
 	&dev_attr_bmAttributes.attr,
 	&dev_attr_bMaxPower.attr,
+	&dev_attr_urbnum.attr,
 	/* device attributes */
 	&dev_attr_idVendor.attr,
 	&dev_attr_idProduct.attr,
diff --git a/drivers/usb/core/usb.c b/drivers/usb/core/usb.c
index 8121edb..c99938d 100644
--- a/drivers/usb/core/usb.c
+++ b/drivers/usb/core/usb.c
@@ -266,6 +266,7 @@
 	dev->dev.dma_mask = bus->controller->dma_mask;
 	set_dev_node(&dev->dev, dev_to_node(bus->controller));
 	dev->state = USB_STATE_ATTACHED;
+	atomic_set(&dev->urbnum, 0);
 
 	INIT_LIST_HEAD(&dev->ep0.urb_list);
 	dev->ep0.desc.bLength = USB_DT_ENDPOINT_SIZE;