Index: usb-devel/drivers/usb/class/cdc-wdm.c
===================================================================
--- usb-devel.orig/drivers/usb/class/cdc-wdm.c
+++ usb-devel/drivers/usb/class/cdc-wdm.c
@@ -265,18 +265,11 @@ static void wdm_int_callback(struct urb
 			set_bit(WDM_INT_STALL, &desc->flags);
 			dev_err(&desc->intf->dev, "Stall on int endpoint\n");
 			goto sw; /* halt is cleared in work */
-		default:
-			dev_err(&desc->intf->dev,
-				"nonzero urb status received: %d\n", status);
-			break;
 		}
 	}
 
-	if (urb->actual_length < sizeof(struct usb_cdc_notification)) {
-		dev_err(&desc->intf->dev, "wdm_int_callback - %d bytes\n",
-			urb->actual_length);
+	if (urb->actual_length < sizeof(struct usb_cdc_notification))
 		goto exit;
-	}
 
 	switch (dr->bNotificationType) {
 	case USB_CDC_NOTIFY_RESPONSE_AVAILABLE:
Index: usb-devel/drivers/usb/gadget/legacy/raw_gadget.c
===================================================================
--- usb-devel.orig/drivers/usb/gadget/legacy/raw_gadget.c
+++ usb-devel/drivers/usb/gadget/legacy/raw_gadget.c
@@ -596,8 +596,6 @@ static int raw_ioctl_run(struct raw_dev
 
 	spin_lock_irqsave(&dev->lock, flags);
 	if (ret) {
-		dev_err(dev->dev,
-			"fail, usb_gadget_register_driver returned %d\n", ret);
 		dev->state = STATE_DEV_FAILED;
 		goto out_unlock;
 	}
Index: usb-devel/drivers/usb/gadget/udc/core.c
===================================================================
--- usb-devel.orig/drivers/usb/gadget/udc/core.c
+++ usb-devel/drivers/usb/gadget/udc/core.c
@@ -1699,8 +1699,6 @@ int usb_gadget_register_driver_owner(str
 	mutex_lock(&udc_lock);
 	if (!driver->is_bound) {
 		if (driver->match_existing_only) {
-			pr_warn("%s: couldn't find an available UDC or it's busy\n",
-					driver->function);
 			ret = -EBUSY;
 		} else {
 			pr_info("%s: couldn't find an available UDC\n",
Index: usb-devel/drivers/usb/gadget/udc/dummy_hcd.c
===================================================================
--- usb-devel.orig/drivers/usb/gadget/udc/dummy_hcd.c
+++ usb-devel/drivers/usb/gadget/udc/dummy_hcd.c
@@ -989,12 +989,42 @@ static DEVICE_ATTR_RO(function);
  * for each driver that registers:  just add to a big root hub.
  */
 
+static struct timer_list	alan_timer;
+static int			alan_count;
+#define ALAN_MAX		20
+
+static void alan_callback(struct timer_list *t)
+{
+	if (++alan_count >= ALAN_MAX)
+		return;
+	mod_timer(&alan_timer, jiffies + msecs_to_jiffies(1));
+}
+
+static void test_alan_timer(void)
+{
+	int	alan_prev;
+
+	alan_prev = alan_count = 0;
+	mod_timer(&alan_timer, jiffies + msecs_to_jiffies(1));
+	for (;;) {
+		if (alan_prev != alan_count) {
+			alan_prev = alan_count;
+			pr_info("alan_count %d\n", alan_prev);
+			if (alan_prev >= ALAN_MAX)
+				break;
+		}
+		cpu_relax();
+	}
+}
+
 static int dummy_udc_start(struct usb_gadget *g,
 		struct usb_gadget_driver *driver)
 {
 	struct dummy_hcd	*dum_hcd = gadget_to_dummy_hcd(g);
 	struct dummy		*dum = dum_hcd->dum;
 
+	test_alan_timer();
+
 	switch (g->speed) {
 	/* All the speeds we support */
 	case USB_SPEED_LOW:
@@ -2769,6 +2799,8 @@ static int __init dummy_hcd_init(void)
 	int	i;
 	struct	dummy *dum[MAX_NUM_UDC] = {};
 
+	timer_setup(&alan_timer, alan_callback, TIMER_PINNED);
+
 	if (usb_disabled())
 		return -ENODEV;