netdev - [PATCH] r8169: use correct barrier between cacheable and non-cacheable memory

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Date:	Wed, 03 Mar 2010 21:33:10 -0500
From:	David Dillow <dave@...dillows.org>
To:	netdev@...r.kernel.org
Cc:	Francois Romieu <romieu@...zoreil.com>,
	Paul Mackerras <paulus@...ba.org>,
	Catalin Marinas <catalin.marinas@....com>
Subject: [PATCH] r8169: use correct barrier between cacheable and
 non-cacheable memory

r8169 needs certain writes to be visible to other CPUs or the NIC before
touching the hardware, but was using smp_wmb() which is only required to
order cacheable memory access. Switch to wmb() which is required to
order both cacheable and non-cacheable memory.

Noticed by Catalin Marinas and Paul Mackerras.

Signed-off-by: David Dillow <dave@...dillows.org>
---
diff --git a/drivers/net/r8169.c b/drivers/net/r8169.c
index dfc3573..9d3ebf3 100644
--- a/drivers/net/r8169.c
+++ b/drivers/net/r8169.c
@@ -4270,7 +4270,7 @@ static netdev_tx_t rtl8169_start_xmit(struct sk_buff *skb,
 
 	tp->cur_tx += frags + 1;
 
-	smp_wmb();
+	wmb();
 
 	RTL_W8(TxPoll, NPQ);	/* set polling bit */
 
@@ -4621,7 +4621,7 @@ static int rtl8169_poll(struct napi_struct *napi, int budget)
 		 * until it does.
 		 */
 		tp->intr_mask = 0xffff;
-		smp_wmb();
+		wmb();
 		RTL_W16(IntrMask, tp->intr_event);
 	}
 


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