lan78xx: Debounce link events to minimize poll storm

The bInterval is set to 4 (i.e. 8 microframes => 1ms) and the only bit
that the driver pays attention to is "link was reset". If there's a
flapping status bit in that endpoint data, (such as if PHY negotiation
needs a few tries to get a stable link) then polling at a slower rate
would act as a de-bounce.

See: #2447

drivers/net/usb/lan78xx.c

@@ -448,6 +448,11 @@ static bool enable_tso;
 module_param(enable_tso, bool, 0644);
 MODULE_PARM_DESC(enable_tso, "Enables TCP segmentation offload");
 
+#define INT_URB_MICROFRAMES_PER_MS	8
+static int int_urb_interval_ms = 8;
+module_param(int_urb_interval_ms, int, 0);
+MODULE_PARM_DESC(int_urb_interval_ms, "Override usb interrupt urb interval");
+
 static int lan78xx_read_reg(struct lan78xx_net *dev, u32 index, u32 *data)
 {
 	u32 *buf = kmalloc(sizeof(u32), GFP_KERNEL);
@@ -3816,7 +3821,12 @@ static int lan78xx_probe(struct usb_interface *intf,
 	dev->pipe_intr = usb_rcvintpipe(dev->udev,
 					dev->ep_intr->desc.bEndpointAddress &
 					USB_ENDPOINT_NUMBER_MASK);
-	period = dev->ep_intr->desc.bInterval;
+	if (int_urb_interval_ms <= 0)
+		period = dev->ep_intr->desc.bInterval;
+	else
+		period = int_urb_interval_ms * INT_URB_MICROFRAMES_PER_MS;
+
+	netif_notice(dev, probe, netdev, "int urb period %d\n", period);
 
 	maxp = usb_maxpacket(dev->udev, dev->pipe_intr, 0);
 	buf = kmalloc(maxp, GFP_KERNEL);