netdev - Re: [PATCH net-2.6] net: Keep TX queues stopped as long as the physical device is absent

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Message-ID: <1305582834.2885.55.camel@bwh-desktop>
Date:	Mon, 16 May 2011 22:53:54 +0100
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	David Miller <davem@...emloft.net>
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH net-2.6] net: Keep TX queues stopped as long as the
 physical device is absent

On Mon, 2011-05-16 at 22:04 +0100, Ben Hutchings wrote:
> netif_device_detach() stops all TX queues, but there is nothing to
> prevent them from being restarted.  In fact, netif_tx_unlock() may now
                          rescheduled
> do this.  Add another queue state flag that is set while the device is
> absent, and make netif_tx_queue_frozen_or_stopped() test it.  Rename the
> function to netif_tx_queue_blocked() since it makes little sense to keep
> adding flags to its name.
[...]

So I suspect this isn't a real problem - as long as the device remains
detached then the driver won't (or shouldn't) start the queues again.
Although the queues may be scheduled (which this patch doesn't change),
ndo_start_xmit() will not be called.

Ben.

-- 
Ben Hutchings, Senior Software Engineer, Solarflare
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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