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cxgb4: Not need to hold the adap_rcu_lock lock when read adap_rcu_list
cxgb4_netdev maybe lead to dead lock, since it uses a spin lock, and be called in both thread and softirq context, but not disable BH, the lockdep report is below; In fact, cxgb4_netdev only reads adap_rcu_list with RCU protection, so not need to hold spin lock again. ================================= [ INFO: inconsistent lock state ] 3.14.7+ #24 Tainted: G C O --------------------------------- inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. radvd/3794 [HC0[0]:SC1[1]:HE1:SE0] takes: (adap_rcu_lock){+.?...}, at: [<ffffffffa09989ea>] clip_add+0x2c/0x116 [cxgb4] {SOFTIRQ-ON-W} state was registered at: [<ffffffff810fca81>] __lock_acquire+0x34a/0xe48 [<ffffffff810fd98b>] lock_acquire+0x82/0x9d [<ffffffff815d6ff8>] _raw_spin_lock+0x34/0x43 [<ffffffffa09989ea>] clip_add+0x2c/0x116 [cxgb4] [<ffffffffa0998beb>] cxgb4_inet6addr_handler+0x117/0x12c [cxgb4] [<ffffffff815da98b>] notifier_call_chain+0x32/0x5c [<ffffffff815da9f9>] __atomic_notifier_call_chain+0x44/0x6e [<ffffffff815daa32>] atomic_notifier_call_chain+0xf/0x11 [<ffffffff815b1356>] inet6addr_notifier_call_chain+0x16/0x18 [<ffffffffa01f72e5>] ipv6_add_addr+0x404/0x46e [ipv6] [<ffffffffa01f8df0>] addrconf_add_linklocal+0x5f/0x95 [ipv6] [<ffffffffa01fc3e9>] addrconf_notify+0x632/0x841 [ipv6] [<ffffffff815da98b>] notifier_call_chain+0x32/0x5c [<ffffffff810e09a1>] __raw_notifier_call_chain+0x9/0xb [<ffffffff810e09b2>] raw_notifier_call_chain+0xf/0x11 [<ffffffff8151b3b7>] call_netdevice_notifiers_info+0x4e/0x56 [<ffffffff8151b3d0>] call_netdevice_notifiers+0x11/0x13 [<ffffffff8151c0a6>] netdev_state_change+0x1f/0x38 [<ffffffff8152f004>] linkwatch_do_dev+0x3b/0x49 [<ffffffff8152f184>] __linkwatch_run_queue+0x10b/0x144 [<ffffffff8152f1dd>] linkwatch_event+0x20/0x27 [<ffffffff810d7bc0>] process_one_work+0x1cb/0x2ee [<ffffffff810d7e3b>] worker_thread+0x12e/0x1fc [<ffffffff810dd391>] kthread+0xc4/0xcc [<ffffffff815dc48c>] ret_from_fork+0x7c/0xb0 irq event stamp: 3388 hardirqs last enabled at (3388): [<ffffffff810c6c85>] __local_bh_enable_ip+0xaa/0xd9 hardirqs last disabled at (3387): [<ffffffff810c6c2d>] __local_bh_enable_ip+0x52/0xd9 softirqs last enabled at (3288): [<ffffffffa01f1d5b>] rcu_read_unlock_bh+0x0/0x2f [ipv6] softirqs last disabled at (3289): [<ffffffff815ddafc>] do_softirq_own_stack+0x1c/0x30 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(adap_rcu_lock); <Interrupt> lock(adap_rcu_lock); *** DEADLOCK *** 5 locks held by radvd/3794: #0: (sk_lock-AF_INET6){+.+.+.}, at: [<ffffffffa020b85a>] rawv6_sendmsg+0x74b/0xa4d [ipv6] #1: (rcu_read_lock){.+.+..}, at: [<ffffffff8151ac6b>] rcu_lock_acquire+0x0/0x29 #2: (rcu_read_lock){.+.+..}, at: [<ffffffffa01f4cca>] rcu_lock_acquire.constprop.16+0x0/0x30 [ipv6] #3: (rcu_read_lock){.+.+..}, at: [<ffffffff810e09b4>] rcu_lock_acquire+0x0/0x29 #4: (rcu_read_lock){.+.+..}, at: [<ffffffffa0998782>] rcu_lock_acquire.constprop.40+0x0/0x30 [cxgb4] stack backtrace: CPU: 7 PID: 3794 Comm: radvd Tainted: G C O 3.14.7+ #24 Hardware name: Supermicro X7DBU/X7DBU, BIOS 6.00 12/03/2007 ffffffff81f15990 ffff88012fdc36a8 ffffffff815d0016 0000000000000006 ffff8800c80dc2a0 ffff88012fdc3708 ffffffff815cc727 0000000000000001 0000000000000001 ffff880100000000 ffffffff81015b02 ffff8800c80dcb58 Call Trace: <IRQ> [<ffffffff815d0016>] dump_stack+0x4e/0x71 [<ffffffff815cc727>] print_usage_bug+0x1ec/0x1fd [<ffffffff81015b02>] ? save_stack_trace+0x27/0x44 [<ffffffff810fbfaa>] ? check_usage_backwards+0xa0/0xa0 [<ffffffff810fc640>] mark_lock+0x11b/0x212 [<ffffffff810fca0b>] __lock_acquire+0x2d4/0xe48 [<ffffffff810fbfaa>] ? check_usage_backwards+0xa0/0xa0 [<ffffffff810fbff6>] ? check_usage_forwards+0x4c/0xa6 [<ffffffff810c6c8a>] ? __local_bh_enable_ip+0xaf/0xd9 [<ffffffff810fd98b>] lock_acquire+0x82/0x9d [<ffffffffa09989ea>] ? clip_add+0x2c/0x116 [cxgb4] [<ffffffffa0998782>] ? rcu_read_unlock+0x23/0x23 [cxgb4] [<ffffffff815d6ff8>] _raw_spin_lock+0x34/0x43 [<ffffffffa09989ea>] ? clip_add+0x2c/0x116 [cxgb4] [<ffffffffa09987b0>] ? rcu_lock_acquire.constprop.40+0x2e/0x30 [cxgb4] [<ffffffffa0998782>] ? rcu_read_unlock+0x23/0x23 [cxgb4] [<ffffffffa09989ea>] clip_add+0x2c/0x116 [cxgb4] [<ffffffffa0998beb>] cxgb4_inet6addr_handler+0x117/0x12c [cxgb4] [<ffffffff810fd99d>] ? lock_acquire+0x94/0x9d [<ffffffff810e09b4>] ? raw_notifier_call_chain+0x11/0x11 [<ffffffff815da98b>] notifier_call_chain+0x32/0x5c [<ffffffff815da9f9>] __atomic_notifier_call_chain+0x44/0x6e [<ffffffff815daa32>] atomic_notifier_call_chain+0xf/0x11 [<ffffffff815b1356>] inet6addr_notifier_call_chain+0x16/0x18 [<ffffffffa01f72e5>] ipv6_add_addr+0x404/0x46e [ipv6] [<ffffffff810fde6a>] ? trace_hardirqs_on+0xd/0xf [<ffffffffa01fb634>] addrconf_prefix_rcv+0x385/0x6ea [ipv6] [<ffffffffa0207950>] ndisc_rcv+0x9d3/0xd76 [ipv6] [<ffffffffa020d536>] icmpv6_rcv+0x592/0x67b [ipv6] [<ffffffff810c6c85>] ? __local_bh_enable_ip+0xaa/0xd9 [<ffffffff810c6c85>] ? __local_bh_enable_ip+0xaa/0xd9 [<ffffffff810fd8dc>] ? lock_release+0x14e/0x17b [<ffffffffa020df97>] ? rcu_read_unlock+0x21/0x23 [ipv6] [<ffffffff8150df52>] ? rcu_read_unlock+0x23/0x23 [<ffffffffa01f4ede>] ip6_input_finish+0x1e4/0x2fc [ipv6] [<ffffffffa01f540b>] ip6_input+0x33/0x38 [ipv6] [<ffffffffa01f5557>] ip6_mc_input+0x147/0x160 [ipv6] [<ffffffffa01f4ba3>] ip6_rcv_finish+0x7c/0x81 [ipv6] [<ffffffffa01f5397>] ipv6_rcv+0x3a1/0x3e2 [ipv6] [<ffffffff8151ef96>] __netif_receive_skb_core+0x4ab/0x511 [<ffffffff810fdc94>] ? mark_held_locks+0x71/0x99 [<ffffffff8151f0c0>] ? process_backlog+0x69/0x15e [<ffffffff8151f045>] __netif_receive_skb+0x49/0x5b [<ffffffff8151f0cf>] process_backlog+0x78/0x15e [<ffffffff8151f571>] ? net_rx_action+0x1a2/0x1cc [<ffffffff8151f47b>] net_rx_action+0xac/0x1cc [<ffffffff810c69b7>] ? __do_softirq+0xad/0x218 [<ffffffff810c69ff>] __do_softirq+0xf5/0x218 [<ffffffff815ddafc>] do_softirq_own_stack+0x1c/0x30 <EOI> [<ffffffff810c6bb6>] do_softirq+0x38/0x5d [<ffffffffa01f1d5b>] ? ip6_copy_metadata+0x156/0x156 [ipv6] [<ffffffff810c6c78>] __local_bh_enable_ip+0x9d/0xd9 [<ffffffffa01f1d88>] rcu_read_unlock_bh+0x2d/0x2f [ipv6] [<ffffffffa01f28b4>] ip6_finish_output2+0x381/0x3d8 [ipv6] [<ffffffffa01f49ef>] ip6_finish_output+0x6e/0x73 [ipv6] [<ffffffffa01f4a70>] ip6_output+0x7c/0xa8 [ipv6] [<ffffffff815b1bfa>] dst_output+0x18/0x1c [<ffffffff815b1c9e>] ip6_local_out+0x1c/0x21 [<ffffffffa01f2489>] ip6_push_pending_frames+0x37d/0x427 [ipv6] [<ffffffff81558af8>] ? skb_orphan+0x39/0x39 [<ffffffffa020b85a>] ? rawv6_sendmsg+0x74b/0xa4d [ipv6] [<ffffffffa020ba51>] rawv6_sendmsg+0x942/0xa4d [ipv6] [<ffffffff81584cd2>] inet_sendmsg+0x3d/0x66 [<ffffffff81508930>] __sock_sendmsg_nosec+0x25/0x27 [<ffffffff8150b0d7>] sock_sendmsg+0x5a/0x7b [<ffffffff810fd8dc>] ? lock_release+0x14e/0x17b [<ffffffff8116d756>] ? might_fault+0x9e/0xa5 [<ffffffff8116d70d>] ? might_fault+0x55/0xa5 [<ffffffff81508cb1>] ? copy_from_user+0x2a/0x2c [<ffffffff8150b70c>] ___sys_sendmsg+0x226/0x2d9 [<ffffffff810fcd25>] ? __lock_acquire+0x5ee/0xe48 [<ffffffff810fde01>] ? trace_hardirqs_on_caller+0x145/0x1a1 [<ffffffff8118efcb>] ? slab_free_hook.isra.71+0x50/0x59 [<ffffffff8115c81f>] ? release_pages+0xbc/0x181 [<ffffffff810fd99d>] ? lock_acquire+0x94/0x9d [<ffffffff81115e97>] ? read_seqcount_begin.constprop.25+0x73/0x90 [<ffffffff8150c408>] __sys_sendmsg+0x3d/0x5b [<ffffffff8150c433>] SyS_sendmsg+0xd/0x19 [<ffffffff815dc53d>] system_call_fastpath+0x1a/0x1f Reported-by: Ben Greear <greearb@candelatech.com> Cc: Casey Leedom <leedom@chelsio.com> Cc: Hariprasad Shenai <hariprasad@chelsio.com> Signed-off-by: Li RongQing <roy.qing.li@gmail.com> Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Acked-by: Casey Leedom <leedom@chelsio.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Li RongQing
David S. Miller
parent
66064dbc0c
commit
ee9a33b263
@ -4057,22 +4057,19 @@ int cxgb4_unregister_uld(enum cxgb4_uld type)
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EXPORT_SYMBOL(cxgb4_unregister_uld);
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/* Check if netdev on which event is occured belongs to us or not. Return
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* suceess (1) if it belongs otherwise failure (0).
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* success (true) if it belongs otherwise failure (false).
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* Called with rcu_read_lock() held.
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*/
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static int cxgb4_netdev(struct net_device *netdev)
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static bool cxgb4_netdev(const struct net_device *netdev)
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{
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struct adapter *adap;
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int i;
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spin_lock(&adap_rcu_lock);
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list_for_each_entry_rcu(adap, &adap_rcu_list, rcu_node)
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for (i = 0; i < MAX_NPORTS; i++)
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if (adap->port[i] == netdev) {
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spin_unlock(&adap_rcu_lock);
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return 1;
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}
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spin_unlock(&adap_rcu_lock);
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return 0;
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if (adap->port[i] == netdev)
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return true;
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return false;
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}
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static int clip_add(struct net_device *event_dev, struct inet6_ifaddr *ifa,
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@ -6396,6 +6393,7 @@ static void remove_one(struct pci_dev *pdev)
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adapter->flags &= ~DEV_ENABLED;
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}
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pci_release_regions(pdev);
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synchronize_rcu();
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kfree(adapter);
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} else
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pci_release_regions(pdev);
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