lan78xx: Fix to handle hard_header_len update

Fix to handle hard_header_len update

When ifconfig up/down sequence is initiated hard_header_len
get updated incrementally for each ifconfig up /down sequence,
this leads invalid hard_header_len, moving to lan78xx_bind
to have one time update of hard_header_len addresses the issue.
Signed-off-by: NNisar Sayed <Nisar.Sayed@microchip.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/usb/lan78xx.c

@@ -2367,9 +2367,6 @@ static int lan78xx_reset(struct lan78xx_net *dev)
 	/* Init LTM */
 	lan78xx_init_ltm(dev);
 
-	dev->net->hard_header_len += TX_OVERHEAD;
-	dev->hard_mtu = dev->net->mtu + dev->net->hard_header_len;
-
 	if (dev->udev->speed == USB_SPEED_SUPER) {
 		buf = DEFAULT_BURST_CAP_SIZE / SS_USB_PKT_SIZE;
 		dev->rx_urb_size = DEFAULT_BURST_CAP_SIZE;
@@ -2855,6 +2852,9 @@ static int lan78xx_bind(struct lan78xx_net *dev, struct usb_interface *intf)
 		return ret;
 	}
 
+	dev->net->hard_header_len += TX_OVERHEAD;
+	dev->hard_mtu = dev->net->mtu + dev->net->hard_header_len;
+
 	/* Init all registers */
 	ret = lan78xx_reset(dev);