From e2a66e609745470b1157fe6b6663c804ee44b0b9 Mon Sep 17 00:00:00 2001
From: Marek Vasut <marex@denx.de>
Date: Sun, 26 Aug 2012 10:19:20 +0000
Subject: [PATCH] FEC: Do not pass unaligned buffer to network stack

Do not pass unaligned RX buffer to the upper layers. The upper layer,
especially in the ARP case, recycles the buffer and passes it back into
the FEC, into it's TX path. With caches enabled, the FEC hangs on this
from time to time.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Benoit Thebaudeau <benoit.thebaudeau@advans>
Cc: Eric Nelson <eric.nelson@boundarydevices.com>
Cc: Fabio Estevam <festevam@gmail.com>
Cc: Joe Hershberger <joe.hershberger@ni.com>
Tested-by: Fabio Estevam <fabio.estevam@freescale.com>
---
 drivers/net/fec_mxc.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/fec_mxc.c b/drivers/net/fec_mxc.c
index fbfc842..7b6a997 100644
--- a/drivers/net/fec_mxc.c
+++ b/drivers/net/fec_mxc.c
@@ -31,6 +31,7 @@
 #include <asm/arch/imx-regs.h>
 #include <asm/io.h>
 #include <asm/errno.h>
+#include <linux/compiler.h>
 
 DECLARE_GLOBAL_DATA_PTR;
 
@@ -791,7 +792,7 @@ static int fec_recv(struct eth_device *dev)
 	uint16_t bd_status;
 	uint32_t addr, size;
 	int i;
-	uchar buff[FEC_MAX_PKT_SIZE];
+	uchar buff[FEC_MAX_PKT_SIZE] __aligned(ARCH_DMA_MINALIGN);
 
 	/*
 	 * Check if any critical events have happened
-- 
2.7.4