From 4c020a961a812ffae9846b917304cea504c3a733 Mon Sep 17 00:00:00 2001 From: David Dillow Date: Wed, 3 Mar 2010 16:33:10 +0000 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 Signed-off-by: David S. Miller --- drivers/net/r8169.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/net/r8169.c b/drivers/net/r8169.c index dfc3573..9d3ebf3e97 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); } -- 2.7.4