1 files changed, 34 insertions, 10 deletions

diff --git a/drivers/usb/net/usbnet.c b/drivers/usb/net/usbnet.c
index 54183e173a6d..98a522f1e264 100644
--- a/drivers/usb/net/usbnet.c
+++ b/drivers/usb/net/usbnet.c
@@ -61,8 +61,11 @@
  * let the USB host controller be busy for 5msec or more before an irq
  * is required, under load.  Jumbograms change the equation.
  */
-#define RX_QLEN(dev) (((dev)->udev->speed == USB_SPEED_HIGH) ? 60 : 4)
-#define TX_QLEN(dev) (((dev)->udev->speed == USB_SPEED_HIGH) ? 60 : 4)
+#define RX_MAX_QUEUE_MEMORY (60 * 1518)
+#define RX_QLEN(dev) (((dev)->udev->speed == USB_SPEED_HIGH) ? \
+                        (RX_MAX_QUEUE_MEMORY/(dev)->rx_urb_size) : 4)
+#define TX_QLEN(dev) (((dev)->udev->speed == USB_SPEED_HIGH) ? \
+                        (RX_MAX_QUEUE_MEMORY/(dev)->hard_mtu) : 4)
 
 // reawaken network queue this soon after stopping; else watchdog barks
 #define TX_TIMEOUT_JIFFIES      (5*HZ)
@@ -227,13 +230,23 @@ static int usbnet_change_mtu (struct net_device *net, int new_mtu)
 {
         struct usbnet   *dev = netdev_priv(net);
         int             ll_mtu = new_mtu + net->hard_header_len;
+        int             old_hard_mtu = dev->hard_mtu;
+        int             old_rx_urb_size = dev->rx_urb_size;
 
-        if (new_mtu <= 0 || ll_mtu > dev->hard_mtu)
+        if (new_mtu <= 0)
                 return -EINVAL;
         // no second zero-length packet read wanted after mtu-sized packets
         if ((ll_mtu % dev->maxpacket) == 0)
                 return -EDOM;
         net->mtu = new_mtu;
+
+        dev->hard_mtu = net->mtu + net->hard_header_len;
+        if (dev->rx_urb_size == old_hard_mtu) {
+                dev->rx_urb_size = dev->hard_mtu;
+                if (dev->rx_urb_size > old_rx_urb_size)
+                        usbnet_unlink_rx_urbs(dev);
+        }
+
         return 0;
 }
 
@@ -412,9 +425,9 @@ static void rx_complete (struct urb *urb, struct pt_regs *regs)
             // we get controller i/o faults during khubd disconnect() delays.
             // throttle down resubmits, to avoid log floods; just temporarily,
             // so we still recover when the fault isn't a khubd delay.
-            case -EPROTO:               // ehci
-            case -ETIMEDOUT:            // ohci
-            case -EILSEQ:               // uhci
+            case -EPROTO:
+            case -ETIME:
+            case -EILSEQ:
                 dev->stats.rx_errors++;
                 if (!timer_pending (&dev->delay)) {
                         mod_timer (&dev->delay, jiffies + THROTTLE_JIFFIES);
@@ -521,6 +534,17 @@ static int unlink_urbs (struct usbnet *dev, struct sk_buff_head *q)
         return count;
 }
 
+// Flush all pending rx urbs
+// minidrivers may need to do this when the MTU changes
+
+void usbnet_unlink_rx_urbs(struct usbnet *dev)
+{
+        if (netif_running(dev->net)) {
+                (void) unlink_urbs (dev, &dev->rxq);
+                tasklet_schedule(&dev->bh);
+        }
+}
+EXPORT_SYMBOL_GPL(usbnet_unlink_rx_urbs);
 
 /*-------------------------------------------------------------------------*/
 
@@ -629,7 +653,7 @@ static int usbnet_open (struct net_device *net)
 
                 devinfo (dev, "open: enable queueing "
                                 "(rx %d, tx %d) mtu %d %s framing",
-                        RX_QLEN (dev), TX_QLEN (dev), dev->net->mtu,
+                        (int)RX_QLEN (dev), (int)TX_QLEN (dev), dev->net->mtu,
                         framing);
         }
 
@@ -797,9 +821,9 @@ static void tx_complete (struct urb *urb, struct pt_regs *regs)
 
                 // like rx, tx gets controller i/o faults during khubd delays
                 // and so it uses the same throttling mechanism.
-                case -EPROTO:           // ehci
-                case -ETIMEDOUT:        // ohci
-                case -EILSEQ:           // uhci
+                case -EPROTO:
+                case -ETIME:
+                case -EILSEQ:
                         if (!timer_pending (&dev->delay)) {
                                 mod_timer (&dev->delay,
                                         jiffies + THROTTLE_JIFFIES);