[U-Boot] [PATCH 1/2] FEC: Do not pass unaligned buffer to network stack

[Marek Vasut]

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 at denx.de>
Cc: Benoit Thebaudeau <benoit.thebaudeau at advans>
Cc: Eric Nelson <eric.nelson at boundarydevices.com>
Cc: Fabio Estevam <festevam at gmail.com>
Cc: Joe Hershberger <joe.hershberger at ni.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
-- 
1.7.10.4