From 6febb77650e96402767132b69b229fc3ae2f6ca4 Mon Sep 17 00:00:00 2001
From: "David S. Miller" <davem@nuts.ninka.net>
Date: Tue, 22 Apr 2003 10:19:42 -0700
Subject: [PATCH] [NET]: SG without checksum support is illegal.

---
 net/core/dev.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/net/core/dev.c b/net/core/dev.c
index b6f627be7b08d..9c041e1be73ef 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -2582,6 +2582,16 @@ int register_netdevice(struct net_device *dev)
 	if ((ret = kobject_register(&dev->kobj)))
 		goto out_err;
 	
+	/* Fix illegal SG+CSUM combinations. */
+	if ((dev->features & NETIF_F_SG) &&
+	    !(dev->features & (NETIF_F_IP_CSUM |
+			       NETIF_F_NO_CSUM |
+			       NETIF_F_HW_CSUM))) {
+		printk("%s: Dropping NETIF_F_SG since no checksum feature.\n",
+		       dev->name);
+		dev->features &= ~NETIF_F_SG;
+	}
+
 	/*
 	 *	nil rebuild_header routine,
 	 *	that should be never called and used as just bug trap.
-- 
2.53.0