netdev - [PATCH 11/14] Spidernet Memory barrier

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Message-ID: <20061213212204.GK1915@austin.ibm.com>
Date:	Wed, 13 Dec 2006 15:22:04 -0600
From:	linas@...tin.ibm.com (Linas Vepstas)
To:	Andrew Morton <akpm@...l.org>
Cc:	netdev@...r.kernel.org, linuxppc-dev@...abs.org, jgarzik@...ox.com,
	Christoph Hellwig <hch@...radead.org>,
	Ishizaki Kou <kou.ishizaki@...hiba.co.jp>,
	Jens Osterkamp <Jens.Osterkamp@....de>,
	James K Lewis <jim@...ewis.com>,
	Arnd Bergmann <arnd@...db.de>
Subject: [PATCH 11/14] 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@...tin.ibm.com>
Cc: James K Lewis <jklewis@...ibm.com>
Cc: Arnd Bergmann <arnd@...db.de>

----
 drivers/net/spider_net.c |    1 +
 1 file changed, 1 insertion(+)

Index: linux-2.6.19-git7/drivers/net/spider_net.c
===================================================================
--- linux-2.6.19-git7.orig/drivers/net/spider_net.c	2006-12-13 14:28:19.000000000 -0600
+++ linux-2.6.19-git7/drivers/net/spider_net.c	2006-12-13 14:28:23.000000000 -0600
@@ -419,6 +419,7 @@ spider_net_prepare_rx_descr(struct spide
 		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;
 	}
-
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