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 <[email protected]> Signed-off-by: Rabin Vincent <[email protected]> Signed-off-by: David S. Miller <[email protected]>
redpig · Apr 2, 2012 · 78fb72f · 78fb72f
1 parent 10b9194
commit 78fb72f
Showing 1 changed file with 1 addition and 0 deletions.
diff --git 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;
 }