netdev - [PATCH] net: usb: smsc75xx: fix mtu

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Date:	Sun, 15 Apr 2012 23:38:29 +0200
From:	Stephane Fillod <fillods@...rs.sf.net>
To:	netdev@...r.kernel.org
Cc:	steve.glendinning@...c.com
Subject: [PATCH] net: usb: smsc75xx: fix mtu

Make smsc75xx recalculate the hard_mtu after adjusting the
hard_header_len.

Without this, usbnet adjusts the MTU down to 1492 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/Omap3 with EVB-LAN7500-LC.

Signed-off-by: Stephane Fillod <fillods@...rs.sf.net>
---

--- a/drivers/net/usb/smsc75xx.c
+++ b/drivers/net/usb/smsc75xx.c
@@ -1049,6 +1049,7 @@
 	dev->net->ethtool_ops = &smsc75xx_ethtool_ops;
 	dev->net->flags |= IFF_MULTICAST;
 	dev->net->hard_header_len += SMSC75XX_TX_OVERHEAD;
+	dev->hard_mtu = dev->net->mtu + dev->net->hard_header_len;
 	return 0;
 }

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