* [PATCH] r8169: use correct barrier between cacheable and non-cacheable memory
@ 2010-03-04 2:33 David Dillow
2010-03-04 8:40 ` David Miller
0 siblings, 1 reply; 2+ messages in thread
From: David Dillow @ 2010-03-04 2:33 UTC (permalink / raw)
To: netdev; +Cc: Francois Romieu, Paul Mackerras, Catalin Marinas
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@thedillows.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);
}
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] r8169: use correct barrier between cacheable and non-cacheable memory
2010-03-04 2:33 [PATCH] r8169: use correct barrier between cacheable and non-cacheable memory David Dillow
@ 2010-03-04 8:40 ` David Miller
0 siblings, 0 replies; 2+ messages in thread
From: David Miller @ 2010-03-04 8:40 UTC (permalink / raw)
To: dave; +Cc: netdev, romieu, paulus, catalin.marinas
From: David Dillow <dave@thedillows.org>
Date: Wed, 03 Mar 2010 21:33:10 -0500
> 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@thedillows.org>
Applied.
^ permalink raw reply [flat|nested] 2+ messages in thread
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2010-03-04 2:33 [PATCH] r8169: use correct barrier between cacheable and non-cacheable memory David Dillow
2010-03-04 8:40 ` David Miller
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