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Date: Fri, 4 Jan 2013 15:07:02 +0100
From: Lubomir Rintel <lkundrak@...sk>
To: Lennert Buytenhek <buytenh@...tstofly.org>
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
Lubomir Rintel <lubo.rintel@...ddata.com>
Subject: [PATCH] mv643xx_eth: Fix a possible deadlock upon ifdown
From: Lubomir Rintel <lubo.rintel@...ddata.com>
=================================
[ INFO: inconsistent lock state ]
3.7.0-6.luboskovo.fc19.armv5tel.kirkwood #1 Tainted: G W
---------------------------------
inconsistent {IN-SOFTIRQ-W} -> {SOFTIRQ-ON-W} usage.
NetworkManager/337 [HC0[0]:SC0[0]:HE1:SE1] takes:
(_xmit_ETHER#2){+.?...}, at: [<bf07adfc>] txq_reclaim+0x54/0x264 [mv643xx_eth]
{IN-SOFTIRQ-W} state was registered at:
[<c0068480>] __lock_acquire+0x5b4/0x17d0
[<c0069d7c>] lock_acquire+0x160/0x1e0
[<c04f41a0>] _raw_spin_lock+0x50/0x88
[<c0407178>] sch_direct_xmit+0x4c/0x2d4
[<c03ec978>] dev_queue_xmit+0x4b8/0x8d8
[<c0492dc8>] ip6_finish_output2+0x350/0x42c
[<c04b7fd8>] mld_sendpack+0x2d0/0x514
[<c04b8834>] mld_ifc_timer_expire+0x228/0x278
[<c002afe8>] call_timer_fn+0x140/0x33c
[<c002bbf0>] run_timer_softirq+0x278/0x32c
[<c0024288>] __do_softirq+0x16c/0x398
[<c002488c>] irq_exit+0x5c/0xc0
[<c0009c64>] handle_IRQ+0x6c/0x8c
[<c04f5218>] __irq_svc+0x38/0x80
[<c0065684>] lock_is_held+0x4/0x54
[<c004d5a0>] __might_sleep+0x44/0x228
[<c04f25a4>] down_read+0x28/0x88
[<c0263c94>] __copy_to_user_memcpy+0xa8/0x140
[<c01374d0>] seq_read+0x3ac/0x474
[<c011623c>] vfs_read+0xac/0x184
[<c0116354>] sys_read+0x40/0x6c
[<c0008cc0>] ret_fast_syscall+0x0/0x38
irq event stamp: 115119
hardirqs last enabled at (115119): [<c04f4cf0>] _raw_spin_unlock_irqrestore+0x44/0x64
hardirqs last disabled at (115118): [<c04f430c>] _raw_spin_lock_irqsave+0x28/0xa0
softirqs last enabled at (114880): [<c00243d4>] __do_softirq+0x2b8/0x398
softirqs last disabled at (114873): [<c002488c>] irq_exit+0x5c/0xc0
other info that might help us debug this:
Possible unsafe locking scenario:
CPU0
----
lock(_xmit_ETHER#2);
<Interrupt>
lock(_xmit_ETHER#2);
*** DEADLOCK ***
1 lock held by NetworkManager/337:
#0: (rtnl_mutex){+.+.+.}, at: [<c03fad04>] rtnetlink_rcv+0x14/0x2c
stack backtrace:
[<c000f5a8>] (unwind_backtrace+0x0/0x124) from [<c04ebea8>] (print_usage_bug.part.29+0x20c/0x26c)
[<c04ebea8>] (print_usage_bug.part.29+0x20c/0x26c) from [<c0067cc4>] (mark_lock+0x404/0x60c)
[<c0067cc4>] (mark_lock+0x404/0x60c) from [<c0068504>] (__lock_acquire+0x638/0x17d0)
[<c0068504>] (__lock_acquire+0x638/0x17d0) from [<c0069d7c>] (lock_acquire+0x160/0x1e0)
[<c0069d7c>] (lock_acquire+0x160/0x1e0) from [<c04f41a0>] (_raw_spin_lock+0x50/0x88)
[<c04f41a0>] (_raw_spin_lock+0x50/0x88) from [<bf07adfc>] (txq_reclaim+0x54/0x264 [mv643xx_eth])
[<bf07adfc>] (txq_reclaim+0x54/0x264 [mv643xx_eth]) from [<bf07b03c>] (txq_deinit+0x30/0xec [mv643xx_eth])
[<bf07b03c>] (txq_deinit+0x30/0xec [mv643xx_eth]) from [<bf07b21c>] (mv643xx_eth_stop+0x124/0x140 [mv643xx_eth])
[<bf07b21c>] (mv643xx_eth_stop+0x124/0x140 [mv643xx_eth]) from [<c03e8bbc>] (__dev_close_many+0xb0/0xec)
[<c03e8bbc>] (__dev_close_many+0xb0/0xec) from [<c03e8c28>] (__dev_close+0x30/0x44)
[<c03e8c28>] (__dev_close+0x30/0x44) from [<c03ed154>] (__dev_change_flags+0x94/0x120)
[<c03ed154>] (__dev_change_flags+0x94/0x120) from [<c03ed260>] (dev_change_flags+0x18/0x4c)
[<c03ed260>] (dev_change_flags+0x18/0x4c) from [<c03fb174>] (do_setlink+0x2cc/0x7ac)
[<c03fb174>] (do_setlink+0x2cc/0x7ac) from [<c03fc5ec>] (rtnl_newlink+0x26c/0x4a8)
[<c03fc5ec>] (rtnl_newlink+0x26c/0x4a8) from [<c03fc104>] (rtnetlink_rcv_msg+0x280/0x29c)
[<c03fc104>] (rtnetlink_rcv_msg+0x280/0x29c) from [<c041245c>] (netlink_rcv_skb+0x58/0xb4)
[<c041245c>] (netlink_rcv_skb+0x58/0xb4) from [<c03fad10>] (rtnetlink_rcv+0x20/0x2c)
[<c03fad10>] (rtnetlink_rcv+0x20/0x2c) from [<c0411dec>] (netlink_unicast+0x158/0x208)
[<c0411dec>] (netlink_unicast+0x158/0x208) from [<c0412254>] (netlink_sendmsg+0x310/0x3c0)
[<c0412254>] (netlink_sendmsg+0x310/0x3c0) from [<c03d209c>] (sock_sendmsg+0xa8/0xd0)
[<c03d209c>] (sock_sendmsg+0xa8/0xd0) from [<c03d2314>] (__sys_sendmsg+0x1d8/0x280)
[<c03d2314>] (__sys_sendmsg+0x1d8/0x280) from [<c03d4054>] (sys_sendmsg+0x44/0x68)
[<c03d4054>] (sys_sendmsg+0x44/0x68) from [<c0008cc0>] (ret_fast_syscall+0x0/0x38)
---
drivers/net/ethernet/marvell/mv643xx_eth.c | 4 ++--
1 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/net/ethernet/marvell/mv643xx_eth.c b/drivers/net/ethernet/marvell/mv643xx_eth.c
index 84c1326..67a3e78 100644
--- a/drivers/net/ethernet/marvell/mv643xx_eth.c
+++ b/drivers/net/ethernet/marvell/mv643xx_eth.c
@@ -943,7 +943,7 @@ static int txq_reclaim(struct tx_queue *txq, int budget, int force)
struct netdev_queue *nq = netdev_get_tx_queue(mp->dev, txq->index);
int reclaimed;
- __netif_tx_lock(nq, smp_processor_id());
+ __netif_tx_lock_bh(nq);
reclaimed = 0;
while (reclaimed < budget && txq->tx_desc_count > 0) {
@@ -989,7 +989,7 @@ static int txq_reclaim(struct tx_queue *txq, int budget, int force)
dev_kfree_skb(skb);
}
- __netif_tx_unlock(nq);
+ __netif_tx_unlock_bh(nq);
if (reclaimed < budget)
mp->work_tx &= ~(1 << txq->index);
--
1.7.1
--
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