From 90476a20fa4742c827b437d9814a51d06c153884 Mon Sep 17 00:00:00 2001
From: Linas Vepstas <linas@austin.ibm.com>
Date: Wed, 13 Dec 2006 15:22:04 -0600
Subject: [PATCH] Spidernet Memory barrier

Add memory barrier to make sure that the rest of the
RX descriptor state is flushed to memory before we tell
the hardware that its ready to go.

Signed-off-by: Linas Vepstas <linas@austin.ibm.com>
Cc: James K Lewis <jklewis@us.ibm.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
---
 drivers/net/spider_net.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/spider_net.c b/drivers/net/spider_net.c
index 67bbd7ba406d..3bf4b9b6662a 100644
--- a/drivers/net/spider_net.c
+++ b/drivers/net/spider_net.c
@@ -419,6 +419,7 @@ spider_net_prepare_rx_descr(struct spider_net_card *card,
 		card->spider_stats.rx_iommu_map_error++;
 		descr->dmac_cmd_status = SPIDER_NET_DESCR_NOT_IN_USE;
 	} else {
+		wmb();
 		descr->dmac_cmd_status = SPIDER_NET_DESCR_CARDOWNED |
 					 SPIDER_NET_DMAC_NOINTR_COMPLETE;
 	}
-- 
2.39.5