---

yaml
---
r: 369197
b: refs/heads/master
c: 4b49f58
h: refs/heads/master
i:
  369195: 8f91fbf
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 0162c55463057196346e7b53f83b5b53a47a32cc
+refs/heads/master: 4b49f58fff00e6e9b24eaa31d4c6324393d76b0a

trunk/drivers/net/usb/usbnet.c

@@ -938,6 +938,27 @@ static const struct ethtool_ops usbnet_ethtool_ops = {
 
 /*-------------------------------------------------------------------------*/
 
+static void __handle_link_change(struct usbnet *dev)
+{
+	if (!test_bit(EVENT_DEV_OPEN, &dev->flags))
+		return;
+
+	if (!netif_carrier_ok(dev->net)) {
+		/* kill URBs for reading packets to save bus bandwidth */
+		unlink_urbs(dev, &dev->rxq);
+
+		/*
+		 * tx_timeout will unlink URBs for sending packets and
+		 * tx queue is stopped by netcore after link becomes off
+		 */
+	} else {
+		/* submitting URBs for reading packets */
+		tasklet_schedule(&dev->bh);
+	}
+
+	clear_bit(EVENT_LINK_CHANGE, &dev->flags);
+}
+
 /* work that cannot be done in interrupt context uses keventd.
  *
  * NOTE:  with 2.5 we could do more of this using completion callbacks,
@@ -1035,8 +1056,14 @@ kevent (struct work_struct *work)
 		} else {
 			usb_autopm_put_interface(dev->intf);
 		}
+
+		/* handle link change from link resetting */
+		__handle_link_change(dev);
 	}
 
+	if (test_bit (EVENT_LINK_CHANGE, &dev->flags))
+		__handle_link_change(dev);
+
 	if (dev->flags)
 		netdev_dbg(dev->net, "kevent done, flags = 0x%lx\n", dev->flags);
 }
@@ -1286,6 +1313,7 @@ static void usbnet_bh (unsigned long param)
 	// or are we maybe short a few urbs?
 	} else if (netif_running (dev->net) &&
 		   netif_device_present (dev->net) &&
+		   netif_carrier_ok(dev->net) &&
 		   !timer_pending (&dev->delay) &&
 		   !test_bit (EVENT_RX_HALT, &dev->flags)) {
 		int	temp = dev->rxq.qlen;
@@ -1663,6 +1691,8 @@ void usbnet_link_change(struct usbnet *dev, bool link, bool need_reset)
 
 	if (need_reset && link)
 		usbnet_defer_kevent(dev, EVENT_LINK_RESET);
+	else
+		usbnet_defer_kevent(dev, EVENT_LINK_CHANGE);
 }
 EXPORT_SYMBOL(usbnet_link_change);
 

trunk/include/linux/usb/usbnet.h

@@ -72,6 +72,7 @@ struct usbnet {
 #		define EVENT_DEVICE_REPORT_IDLE	8
 #		define EVENT_NO_RUNTIME_PM	9
 #		define EVENT_RX_KILL	10
+#		define EVENT_LINK_CHANGE	11
 };
 
 static inline struct usb_driver *driver_of(struct usb_interface *intf)