linux-kernel - [ 03/42] net: usb: cdc

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Message-Id: <20120411231307.812978396@linuxfoundation.org>
Date:	Wed, 11 Apr 2012 16:13:10 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Oliver Neukum <oliver@...kum.name>,
	Rabin Vincent <rabin@....in>,
	"David S. Miller" <davem@...emloft.net>
Subject: [ 03/42] net: usb: cdc_eem: fix mtu

3.0-stable review patch.  If anyone has any objections, please let me know.

------------------


From: Rabin Vincent <rabin@....in>

[ Upstream commit 78fb72f7936c01d5b426c03a691eca082b03f2b9 ]

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@...kum.name>
Signed-off-by: Rabin Vincent <rabin@....in>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/usb/cdc_eem.c |    1 +
 1 file changed, 1 insertion(+)

--- 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,
 	/* 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;
 }


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