netdev - Re: [PATCH v2] ethernet:arc: Fix racing of TX ring buffer

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Message-ID: <5740E98A.5050803@gmx.de>
Date:	Sun, 22 May 2016 01:04:42 +0200
From:	Lino Sanfilippo <LinoSanfilippo@....de>
To:	Francois Romieu <romieu@...zoreil.com>,
	Shuyu Wei <wsy2220@...il.com>
Cc:	David Miller <davem@...emloft.net>, wxt@...k-chips.com,
	heiko@...ech.de, linux-rockchip@...ts.infradead.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH v2] ethernet:arc: Fix racing of TX ring buffer

On 21.05.2016 21:47, Francois Romieu wrote:
> Shuyu Wei <wsy2220@...il.com> :
> [...]
>> diff --git a/drivers/net/ethernet/arc/emac_main.c b/drivers/net/ethernet/arc/emac_main.c
>> index a3a9392..c2447b0 100644
>> --- a/drivers/net/ethernet/arc/emac_main.c
>> +++ b/drivers/net/ethernet/arc/emac_main.c
>> @@ -686,6 +686,9 @@ static int arc_emac_tx(struct sk_buff *skb, struct net_device *ndev)
>>  
>>         skb_tx_timestamp(skb);
>>  
>> +       /* Make sure timestamp is set */
>> +       smp_wmb();
> 
> Should be dma_wmb() (see davem's message).
> 
> It's completely unrelated to SMP.
> 

Its also completely unrelated to dma so I doubt that this is what davem meant.
As far as I understood he was referring to the dma descriptor.

Lino