From 746bf1c3e561aba396cd40e6540245646461117d Mon Sep 17 00:00:00 2001 From: Sean Wang Date: Tue, 4 Jul 2017 11:17:36 +0800 Subject: [PATCH 54/57] net: ethernet: mediatek: fixed deadlock captured by lockdep Lockdep found an inconsistent lock state when mtk_get_stats64 is called in user context while NAPI updates MAC statistics in softirq. Use spin_trylock_bh/spin_unlock_bh fix following lockdep warning. [ 81.321030] WARNING: inconsistent lock state [ 81.325266] 4.12.0-rc1-00035-gd9dda65 #32 Not tainted [ 81.330273] -------------------------------- [ 81.334505] inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. [ 81.340464] ksoftirqd/0/7 [HC0[0]:SC1[1]:HE1:SE0] takes: [ 81.345731] (&syncp->seq#2){+.?...}, at: [] mtk_handle_status_irq.part.6+0x70/0x84 [ 81.354219] {SOFTIRQ-ON-W} state was registered at: [ 81.359062] lock_acquire+0xfc/0x2b0 [ 81.362696] mtk_stats_update_mac+0x60/0x2c0 [ 81.367017] mtk_get_stats64+0x17c/0x18c [ 81.370995] dev_get_stats+0x48/0xbc [ 81.374628] rtnl_fill_stats+0x48/0x128 [ 81.378520] rtnl_fill_ifinfo+0x4ac/0xd1c [ 81.382584] rtmsg_ifinfo_build_skb+0x7c/0xe0 [ 81.386991] rtmsg_ifinfo.part.5+0x24/0x54 [ 81.391139] rtmsg_ifinfo+0x24/0x28 [ 81.394685] __dev_notify_flags+0xa4/0xac [ 81.398749] dev_change_flags+0x50/0x58 [ 81.402640] devinet_ioctl+0x768/0x85c [ 81.406444] inet_ioctl+0x1a4/0x1d0 [ 81.409990] sock_ioctl+0x16c/0x33c [ 81.413538] do_vfs_ioctl+0xb4/0xa34 [ 81.417169] SyS_ioctl+0x44/0x6c [ 81.420458] ret_fast_syscall+0x0/0x1c [ 81.424260] irq event stamp: 3354692 [ 81.427806] hardirqs last enabled at (3354692): [] net_rx_action+0xc0/0x504 [ 81.435660] hardirqs last disabled at (3354691): [] net_rx_action+0x8c/0x504 [ 81.443515] softirqs last enabled at (3354106): [] __do_softirq+0x4b4/0x614 [ 81.451370] softirqs last disabled at (3354109): [] run_ksoftirqd+0x44/0x80 [ 81.459134] [ 81.459134] other info that might help us debug this: [ 81.465608] Possible unsafe locking scenario: [ 81.465608] [ 81.471478] CPU0 [ 81.473900] ---- [ 81.476321] lock(&syncp->seq#2); [ 81.479701] [ 81.482294] lock(&syncp->seq#2); [ 81.485847] [ 81.485847] *** DEADLOCK *** [ 81.485847] [ 81.491720] 1 lock held by ksoftirqd/0/7: [ 81.495693] #0: (&(&mac->hw_stats->stats_lock)->rlock){+.+...}, at: [] mtk_handle_status_irq.part.6+0x48/0x84 [ 81.506579] [ 81.506579] stack backtrace: [ 81.510904] CPU: 0 PID: 7 Comm: ksoftirqd/0 Not tainted 4.12.0-rc1-00035-gd9dda65 #32 [ 81.518668] Hardware name: Mediatek Cortex-A7 (Device Tree) [ 81.524208] [] (unwind_backtrace) from [] (show_stack+0x20/0x24) [ 81.531899] [] (show_stack) from [] (dump_stack+0xb4/0xe0) [ 81.539072] [] (dump_stack) from [] (print_usage_bug+0x234/0x2e0) [ 81.546846] [] (print_usage_bug) from [] (mark_lock+0x63c/0x7bc) [ 81.554532] [] (mark_lock) from [] (__lock_acquire+0x654/0x1bfc) [ 81.562217] [] (__lock_acquire) from [] (lock_acquire+0xfc/0x2b0) [ 81.569990] [] (lock_acquire) from [] (mtk_stats_update_mac+0x60/0x2c0) [ 81.578283] [] (mtk_stats_update_mac) from [] (mtk_handle_status_irq.part.6+0x70/0x84) [ 81.587865] [] (mtk_handle_status_irq.part.6) from [] (mtk_napi_tx+0x358/0x37c) [ 81.596845] [] (mtk_napi_tx) from [] (net_rx_action+0x244/0x504) [ 81.604533] [] (net_rx_action) from [] (__do_softirq+0x134/0x614) [ 81.612306] [] (__do_softirq) from [] (run_ksoftirqd+0x44/0x80) [ 81.619907] [] (run_ksoftirqd) from [] (smpboot_thread_fn+0x14c/0x25c) [ 81.628110] [] (smpboot_thread_fn) from [] (kthread+0x150/0x180) [ 81.635798] [] (kthread) from [] (ret_from_fork+0x14/0x24) Signed-off-by: Sean Wang --- drivers/net/ethernet/mediatek/mtk_eth_soc.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c @@ -493,9 +493,9 @@ static struct rtnl_link_stats64 * mtk_ge unsigned int start; if (netif_running(dev) && netif_device_present(dev)) { - if (spin_trylock(&hw_stats->stats_lock)) { + if (spin_trylock_bh(&hw_stats->stats_lock)) { mtk_stats_update_mac(mac); - spin_unlock(&hw_stats->stats_lock); + spin_unlock_bh(&hw_stats->stats_lock); } } @@ -2229,9 +2229,9 @@ static void mtk_get_ethtool_stats(struct return; if (netif_running(dev) && netif_device_present(dev)) { - if (spin_trylock(&hwstats->stats_lock)) { + if (spin_trylock_bh(&hwstats->stats_lock)) { mtk_stats_update_mac(mac); - spin_unlock(&hwstats->stats_lock); + spin_unlock_bh(&hwstats->stats_lock); } }