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net: usb: cdc_eem: fix mtu

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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>
This commit is contained in:
Rabin Vincent 2012-03-29 07:15:15 +00:00 committed by David S. Miller
parent 10b9194f95
commit 78fb72f793
1 changed files with 1 additions and 0 deletions
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drivers/net/usb/cdc_eem.c
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@ -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;
}