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| author | Larry Finger <Larry.Finger@lwfinger.net> | 2009-04-02 10:09:43 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2009-04-02 10:09:43 +0200 |
| commit | 4ff61c8f7b5e1e60620a04a64ac0715c0822fdac (patch) | |
| tree | 4748d41f682375bd09a3ef6e2a4ae7376937fe7a | |
| parent | net: allow multiple dev per napi with GRO (diff) | |
| download | linux-4ff61c8f7b5e1e60620a04a64ac0715c0822fdac.tar.xz linux-4ff61c8f7b5e1e60620a04a64ac0715c0822fdac.zip | |
kaweth: Fix locking to be SMP-safe
On an SMP system, the following message is printed. The patch below gets
fixes the problem.
=================================
[ INFO: inconsistent lock state ]
2.6.29-Linus-05093-gc31f403 #57
---------------------------------
inconsistent {hardirq-on-W} -> {in-hardirq-W} usage.
bash/4105 [HC1[1]:SC0[0]:HE0:SE1] takes:
(&kaweth->device_lock){+...}, at: [<ffffffffa01aa286>]
kaweth_usb_receive+0x77/0x1af [kaw eth]
{hardirq-on-W} state was registered at:
[<ffffffff80260503>] __lock_acquire+0x753/0x1685
[<ffffffff8026148a>] lock_acquire+0x55/0x71
[<ffffffff80461ba6>] _spin_lock+0x31/0x3d
[<ffffffffa01aaa0c>] kaweth_start_xmit+0x2b/0x1e1 [kaweth]
[<ffffffff803eccd3>] dev_hard_start_xmit+0x22e/0x2ad
[<ffffffff803fe120>] __qdisc_run+0xf2/0x203
[<ffffffff803ed0cd>] dev_queue_xmit+0x263/0x39b
[<ffffffffa03a47cb>] packet_sendmsg_spkt+0x1c4/0x20a [af_packet]
[<ffffffff803de0c2>] sock_sendmsg+0xe4/0xfd
[<ffffffff803dec8f>] sys_sendto+0xe4/0x10c
[<ffffffff8020bccb>] system_call_fastpath+0x16/0x1b
[<ffffffffffffffff>] 0xffffffffffffffff
irq event stamp: 1280
hardirqs last enabled at (1279): [<ffffffff80461a71>]
_spin_unlock_irqrestore+0x44/0x4c
hardirqs last disabled at (1280): [<ffffffff8020bad7>]
save_args+0x67/0x70
softirqs last enabled at (660): [<ffffffff8024192c>]
__do_softirq+0x14d/0x15d
softirqs last disabled at (651): [<ffffffff8020ce9c>]
call_softirq+0x1c/0x28
Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | drivers/net/usb/kaweth.c | 7 |
1 files changed, 3 insertions, 4 deletions
diff --git a/drivers/net/usb/kaweth.c b/drivers/net/usb/kaweth.c index 7cb10a0a5316..3d0d0b0b37c5 100644 --- a/drivers/net/usb/kaweth.c +++ b/drivers/net/usb/kaweth.c @@ -36,7 +36,6 @@ * Run test procedures * Fix bugs from previous two steps * Snoop other OSs for any tricks we're not doing - * SMP locking * Reduce arbitrary timeouts * Smart multicast support * Temporary MAC change support @@ -796,7 +795,7 @@ static int kaweth_start_xmit(struct sk_buff *skb, struct net_device *net) int res; - spin_lock(&kaweth->device_lock); + spin_lock_irq(&kaweth->device_lock); kaweth_async_set_rx_mode(kaweth); netif_stop_queue(net); @@ -814,7 +813,7 @@ static int kaweth_start_xmit(struct sk_buff *skb, struct net_device *net) if (!copied_skb) { kaweth->stats.tx_errors++; netif_start_queue(net); - spin_unlock(&kaweth->device_lock); + spin_unlock_irq(&kaweth->device_lock); return 0; } } @@ -848,7 +847,7 @@ skip: net->trans_start = jiffies; } - spin_unlock(&kaweth->device_lock); + spin_unlock_irq(&kaweth->device_lock); return 0; } |