From 2d70a3d42de642e1d78355338b63cf064dc0f345 Mon Sep 17 00:00:00 2001
From: Sonic Zhang <sonic.zhang@analog.com>
Date: Mon, 10 Jan 2011 02:54:33 +0000
Subject: [PATCH] netdev: bfin_mac: disable hardware checksum if writeback
 cache is enabled

With writeback caches, corrupted RX packets will be sent up the stack
without any error markings.

Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
 drivers/net/bfin_mac.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/net/bfin_mac.h b/drivers/net/bfin_mac.h
index 4827f6b8238e..692187da99f0 100644
--- a/drivers/net/bfin_mac.h
+++ b/drivers/net/bfin_mac.h
@@ -17,7 +17,14 @@
 #include <linux/etherdevice.h>
 #include <linux/bfin_mac.h>
 
+/*
+ * Disable hardware checksum for bug #5600 if writeback cache is
+ * enabled. Otherwize, corrupted RX packet will be sent up stack
+ * without error mark.
+ */
+#ifndef CONFIG_BFIN_EXTMEM_WRITEBACK
 #define BFIN_MAC_CSUM_OFFLOAD
+#endif
 
 #define TX_RECLAIM_JIFFIES (HZ / 5)
 
-- 
2.20.1