netdev - Re: [PATCH 2/4] bnx2x: remove not necessary compiler barrier

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Message-ID: <1268236857.30985.2.camel@lb-tlvb-eilong.il.broadcom.com>
Date:	Wed, 10 Mar 2010 18:00:57 +0200
From:	"Eilon Greenstein" <eilong@...adcom.com>
To:	"Stanislaw Gruszka" <sgruszka@...hat.com>
cc:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"Vladislav Zolotarov" <vladz@...adcom.com>,
	"Michael Chan" <mchan@...adcom.com>
Subject: Re: [PATCH 2/4] bnx2x: remove not necessary compiler barrier

On Tue, 2010-03-09 at 08:55 -0800, Stanislaw Gruszka wrote:
> Access to fp->tx_bd_prod is protected by __netif_tx_lock, so we do not
> need any barrier for that.
> 
> Update of fp->tx_bd_cons in bnx2x_tx_int() is not protected by lock, but
> barrier() nor smb_mb() in bnx2x_tx_avail() not guarantee we will see
> values that is written on other cpu. Ordering issues between
> netif_tx_stop_queue(), netif_tx_queue_stopped(), fp->tx_bd_cons = bd_cons
> and bnx2x_tx_avail() are already handled by smp_mb() in bnx2x_tx_int()
> and bnx2x_start_xmit().
> 
> Signed-off-by: Stanislaw Gruszka <sgruszka@...hat.com>
Signed-off-by: Eilon Greenstein <eilong@...adcom.com>


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