netdev - Re: [PATCH net-next 4/6] net: hip04: Don't free the tx skb when the buffer is not ready for xmit

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Date:	Wed, 15 Apr 2015 16:19:59 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Ding Tianhong <dingtianhong@...wei.com>
Cc:	davem@...emloft.net, grant.likely@...aro.org,
	sergei.shtylyov@...entembedded.com,
	linux-arm-kernel@...ts.infradead.org, eric.dumazet@...il.com,
	zhangfei.gao@...aro.org, joe@...ches.com, netdev@...r.kernel.org,
	devicetree@...r.kernel.org, linux@....linux.org.uk
Subject: Re: [PATCH net-next 4/6] net: hip04: Don't free the tx skb when the buffer is not ready for xmit

On Wednesday 15 April 2015 20:30:06 Ding Tianhong wrote:
> @@ -489,6 +487,8 @@ static int hip04_mac_start_xmit(struct sk_buff *skb, struct net_device *ndev)
>  
>         /* Ensure tx_head update visible to tx reclaim */
>         smp_wmb();
> +       count++;
> +       priv->tx_head = TX_NEXT(tx_head);
>  
> 

Something is wrong here, the comment does not match the code any more, because
the smp_wmb() won't actually make the tx_head update visible.

	Arnd
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