netdev - Re: [PATCH v2] net/mv643xx: don't disable the mib timer too early and lock properly

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Message-Id: <20090218.173743.181282052.davem@davemloft.net>
Date:	Wed, 18 Feb 2009 17:37:44 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	buytenh@...tstofly.org
Cc:	sebastian@...akpoint.cc, jeff@...zik.org, netdev@...r.kernel.org
Subject: Re: [PATCH v2] net/mv643xx: don't disable the mib timer too early
 and lock properly

From: Lennert Buytenhek <buytenh@...tstofly.org>
Date: Thu, 19 Feb 2009 02:05:29 +0100

> On Mon, Feb 16, 2009 at 10:28:15PM +0100, Sebastian Andrzej Siewior wrote:
> 
> > mib_counters_update() also restarts the timer.
> > So the timer is dequeued, the stats are read and then the timer is
> > enqueued again. This is "okay" unless someone unloads the module.
> > The locking here is also broken:
> > mib_counters_update() grabs just a simple spinlock. The only thing the
> > lock is good for is to protect the timer func against other callers
> > namely mv643xx_eth_stop() && mv643xx_eth_get_ethtool_stats(). That means
> > if the spinlock is taken via the ethtool path and than the timer kicks
> > in then the box will lock up.
> > 
> > Signed-off-by: Sebastian Andrzej Siewior <sebastian@...akpoint.cc>
> 
> Acked-by: Lennert Buytenhek <buytenh@...vell.com>

Also applied, thanks!
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