[TCP]: Disable TSO if MD5SIG is enabled.

Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 4f06a51..193d9d6 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -590,6 +590,7 @@
 				kfree(newkey);
 				return -ENOMEM;
 			}
+			sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
 		}
 		tcp_alloc_md5sig_pool();
 		if (tp->md5sig_info->alloced6 == tp->md5sig_info->entries6) {
@@ -724,6 +725,7 @@
 			return -ENOMEM;
 
 		tp->md5sig_info = p;
+		sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
 	}
 
 	newkey = kmemdup(cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL);