net: usb: cdc_eem: fix mtu

Make CDC EEM recalculate the hard_mtu after adjusting the
hard_header_len.

Without this, usbnet adjusts the MTU down to 1494 bytes, and the host is
unable to receive standard 1500-byte frames from the device.

Tested with the Linux USB Ethernet gadget.

Cc: Oliver Neukum <oliver@neukum.name>
Signed-off-by: Rabin Vincent <rabin@rab.in>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 0 deletions

diff --git a/drivers/net/usb/cdc_eem.c b/drivers/net/usb/cdc_eem.c
index 439690be519f..685a4e22c768 100644
--- a/drivers/net/usb/cdc_eem.c
+++ b/drivers/net/usb/cdc_eem.c
@@ -93,6 +93,7 @@ static int eem_bind(struct usbnet *dev, struct usb_interface *intf)
         /* no jumbogram (16K) support for now */
 
         dev->net->hard_header_len += EEM_HEAD + ETH_FCS_LEN;
+        dev->hard_mtu = dev->net->mtu + dev->net->hard_header_len;
 
         return 0;
 }