From: Alexander Duyck <alexander.h.duyck@intel.com>
Date: Tue, 27 Oct 2009 23:52:13 +0000 (+0000)
Subject: igb: limit minimum mtu to 68 to keep ip bound to interface
X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=c809d2276cb035228cd9e83e2ca7d2b902c61cef;p=openwrt%2Fstaging%2Fblogic.git

igb: limit minimum mtu to 68 to keep ip bound to interface

Limit the minimum mtu to 68 in order to prevent ip from being unbound from
the interface.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/drivers/net/igb/igb_main.c b/drivers/net/igb/igb_main.c
index 264ff005710b..846e64f0ad86 100644
--- a/drivers/net/igb/igb_main.c
+++ b/drivers/net/igb/igb_main.c
@@ -3709,8 +3709,7 @@ static int igb_change_mtu(struct net_device *netdev, int new_mtu)
 	int max_frame = new_mtu + ETH_HLEN + ETH_FCS_LEN;
 	u32 rx_buffer_len, i;
 
-	if ((max_frame < ETH_ZLEN + ETH_FCS_LEN) ||
-	    (max_frame > MAX_JUMBO_FRAME_SIZE)) {
+	if ((new_mtu < 68) || (max_frame > MAX_JUMBO_FRAME_SIZE)) {
 		dev_err(&pdev->dev, "Invalid MTU setting\n");
 		return -EINVAL;
 	}