netdev - Re: [PATCH 3/3] net: hisilicon: new hip04 ethernet driver

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Message-ID: <4644970.WiIKNXNpdP@wuerfel>
Date:	Mon, 24 Mar 2014 18:23:58 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Florian Fainelli <f.fainelli@...il.com>
Cc:	Zhangfei Gao <zhangfei.gao@...aro.org>,
	David Miller <davem@...emloft.net>,
	Russell King <linux@....linux.org.uk>,
	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
	Mark Rutland <mark.rutland@....com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	netdev <netdev@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH 3/3] net: hisilicon: new hip04 ethernet driver

On Monday 24 March 2014 09:32:17 Florian Fainelli wrote:
> > +       priv->tx_skb[tx_head] = skb;
> > +       priv->tx_phys[tx_head] = phys;
> > +       desc->send_addr = cpu_to_be32(phys);
> > +       desc->send_size = cpu_to_be16(skb->len);
> > +       desc->cfg = cpu_to_be32(DESC_DEF_CFG);
> > +       phys = priv->tx_desc_dma + tx_head * sizeof(struct tx_desc);
> > +       desc->wb_addr = cpu_to_be32(phys);
> 
> Don't we need a barrier here to ensure that all stores are completed
> before we hand this descriptor address to hip40_set_xmit_desc() which
> should make DMA start processing it?

I would think the writel() in set_xmit_desc() implies the barrier.

	Arnd
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