netdev - Re: [Patch 2/2] mlx4: add dynamic LRO disable support

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Date:	Thu, 03 Jun 2010 13:37:02 +0100
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Amerigo Wang <amwang@...hat.com>
Cc:	netdev@...r.kernel.org, herbert.xu@...hat.com, nhorman@...hat.com,
	sgruszka@...hat.com, davem@...emloft.net
Subject: Re: [Patch 2/2] mlx4: add dynamic LRO disable support

On Wed, 2010-06-02 at 23:39 -0400, Amerigo Wang wrote:
> This patch adds dynamic LRO diable support for mlx4 net driver.
> It also fixes a bug of mlx4, which checks NETIF_F_LRO flag in rx
> path without rtnl lock.
[...]

Is that flag test actually unsafe - and if so, how is testing num_lro
any better?  Perhaps access to net_device::features should be wrapped
with ACCESS_ONCE() to ensure that reads and writes are atomic.

Ben.

-- 
Ben Hutchings, Senior Software Engineer, Solarflare Communications
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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