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Date: Thu, 5 Jun 2008 22:18:42 -0700
From: Andrew Morton <akpm@linux-foundation.org>
To: Tobias Diedrich <ranma+kernel@tdiedrich.de>
Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
       Ayaz Abdulla <aabdulla@nvidia.com>
Subject: Re: forcedeth: lockdep warning on ethtool -s
Message-Id: <20080605221842.a444ec9d.akpm@linux-foundation.org>
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On Sun, 1 Jun 2008 10:37:01 +0200 Tobias Diedrich <ranma+kernel@tdiedrich.de> wrote:

> Hi,
> 
> After enabling CONFIG_LOCKDEP and CONFIG_PROVE_LOCKING I get the
> following warning when ethtool -s is first called on one of the
> forcedeth ports:
> 
> =================================
> [ INFO: inconsistent lock state ]
> 2.6.26-rc4 #28
> ---------------------------------
> inconsistent {in-hardirq-W} -> {hardirq-on-W} usage.
> ethtool/1985 [HC0[0]:SC0[1]:HE1:SE0] takes:
>  (&np->lock){++..}, at: [<ffffffffa000c5fd>] nv_set_settings+0xc8/0x3de [forcedeth]
> {in-hardirq-W} state was registered at:
>   [<ffffffffffffffff>] 0xffffffffffffffff
> irq event stamp: 3606
> hardirqs last  enabled at (3605): [<ffffffff8068106f>] _spin_unlock_irqrestore+0x3f/0x68
> hardirqs last disabled at (3604): [<ffffffff80680d38>] _spin_lock_irqsave+0x13/0x46
> softirqs last  enabled at (3534): [<ffffffff80246ba5>] __do_softirq+0xbc/0xc5
> softirqs last disabled at (3606): [<ffffffff80680b33>] _spin_lock_bh+0x11/0x41
> 
> other info that might help us debug this:
> 2 locks held by ethtool/1985:
>  #0:  (rtnl_mutex){--..}, at: [<ffffffff80596072>] rtnl_lock+0x12/0x14
>  #1:  (_xmit_ETHER){-+..}, at: [<ffffffffa000c5e8>] nv_set_settings+0xb3/0x3de [forcedeth]
> 
> stack backtrace:
> Pid: 1985, comm: ethtool Not tainted 2.6.26-rc4 #28
> 
> Call Trace:
>  [<ffffffff8025f190>] print_usage_bug+0x162/0x173
>  [<ffffffff8025fa8b>] mark_lock+0x231/0x41f
>  [<ffffffff802607cf>] __lock_acquire+0x4e7/0xcac
>  [<ffffffff8025fe64>] ? trace_hardirqs_on+0xf1/0x115
>  [<ffffffff80272c3a>] ? disable_irq_nosync+0x6f/0x7b
>  [<ffffffff80261375>] lock_acquire+0x55/0x6e
>  [<ffffffffa000c5fd>] ? :forcedeth:nv_set_settings+0xc8/0x3de
>  [<ffffffff80680b15>] _spin_lock+0x2f/0x3c
>  [<ffffffffa000c5fd>] :forcedeth:nv_set_settings+0xc8/0x3de
>  [<ffffffff8058f8bb>] dev_ethtool+0x186/0xea3
>  [<ffffffff8067f446>] ? mutex_lock_nested+0x243/0x275
>  [<ffffffff8025df2b>] ? debug_mutex_free_waiter+0x46/0x4a
>  [<ffffffff8067f469>] ? mutex_lock_nested+0x266/0x275
>  [<ffffffff8058e1ce>] dev_ioctl+0x4eb/0x600
>  [<ffffffff8068106f>] ? _spin_unlock_irqrestore+0x3f/0x68
>  [<ffffffff80580f91>] sock_ioctl+0x1f5/0x202
>  [<ffffffff802a322e>] vfs_ioctl+0x2a/0x77
>  [<ffffffff802a34d6>] do_vfs_ioctl+0x25b/0x270
>  [<ffffffff806807b6>] ? trace_hardirqs_on_thunk+0x35/0x3a
>  [<ffffffff802a352d>] sys_ioctl+0x42/0x65
>  [<ffffffff8021fffb>] system_call_after_swapgs+0x7b/0x80
> 
> 
> I think this is caused by the following snippet in nv_set_settings:
> 
> 	netif_carrier_off(dev);
> 	if (netif_running(dev)) {
> 		nv_disable_irq(dev);
> 		netif_tx_lock_bh(dev);
> 		spin_lock(&np->lock);
> 		/* stop engines */
> 		nv_stop_rxtx(dev);
> 		spin_unlock(&np->lock);
> 		netif_tx_unlock_bh(dev);
> 	}
> 
> 
> Because of nv_disable_irq this is probably not really a problem
> though (I guess) and replacing the spin_lock with spin_lock_irqsave
> could keep interrupts disabled for a longer period of time because
> of delays in nv_stop_rx and nv_stop_tx.

Could you please try that and if it works, send the patch?

Thanks.
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