From: Sonic Zhang <redacted>

Make sure data is really written into the registers before enabling DMA.
Otherwise, the EMAC DMA controller may transfer out a malformed packet.
This patch may also fix netperf bugs or scp bugs.

Signed-off-by: Sonic Zhang <redacted>
Signed-off-by: Mike Frysinger <redacted>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
---
 drivers/net/bfin_mac.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/drivers/net/bfin_mac.c b/drivers/net/bfin_mac.c
index 1905532..626715c 100644
--- a/drivers/net/bfin_mac.c
+++ b/drivers/net/bfin_mac.c

@@ -688,6 +688,9 @@ static int bfin_mac_hard_start_xmit(struct sk_buff *skb,
 		}
 	}
 
+	/* Make sure data is really written into registers before enabling DMA */
+	SSYNC();
+
 	/* enable this packet's dma */
 	current_tx_ptr->desc_a.config |= DMAEN;
 

-- 
1.6.3.1