net: usb: smsc95xx: fix mtu

Make smsc95xx recalculate the hard_mtu after adjusting the
hard_header_len.

Without this, usbnet adjusts the MTU down to 1488 bytes, and the host is
unable to receive standard 1500-byte frames from the device.

Inspired by same fix on cdc_eem 78fb72f7936c01d5b426c03a691eca082b03f2b9.

Tested on ARM/Beagle.

Signed-off-by: Stephane Fillod <fillods@users.sf.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/usb/smsc95xx.c b/drivers/net/usb/smsc95xx.c
index 5f19f84d3494696254793320cda6a1f132a0e6e1..53a1ba5e0c2cb41da479e54eca265e4341d40f78 100644 (file)
--- a/drivers/net/usb/smsc95xx.c
+++ b/drivers/net/usb/smsc95xx.c
@@ -1017,6 +1017,7 @@ static int smsc95xx_bind(struct usbnet *dev, struct usb_interface *intf)
        dev->net->ethtool_ops = &smsc95xx_ethtool_ops;
        dev->net->flags |= IFF_MULTICAST;
        dev->net->hard_header_len += SMSC95XX_TX_OVERHEAD_CSUM;
+       dev->hard_mtu = dev->net->mtu + dev->net->hard_header_len;
        return 0;
 }