7dd6753f6d
Lockdep found an inconsistent lock state when joining a mesh with ath5k. The problem is that ath5k takes the lock for its beacon state, ah->block, with spin_lock_irqsave(), while mesh internally takes the sync_offset_lock with spin_lock_bh() in mesh_sync_offset_adjust_tbtt(), which in turn is called under ah->block. This could deadlock if the beacon tasklet was run on the processor that held the beacon lock during the do_softirq() in spin_unlock_bh(). We probably shouldn't hold the lock around the callbacks, but the easiest fix is to switch to spin_lock_bh for ah->block: it doesn't need interrupts disabled anyway as the data in question is only accessed in softirq or process context. Fixes the following lockdep warning: [ 446.892304] WARNING: at kernel/softirq.c:159 _local_bh_enable_ip+0x38/0xa6() [ 446.892306] Hardware name: MacBook1,1 [ 446.892309] Modules linked in: tcp_lp fuse sunrpc cpufreq_ondemand acpi_cpufreq mperf ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6 nf_conntrack_ipv4 ip6table_filter nf_defrag_ipv4 xt_state nf_conntrack ip6_tables ext2 arc4 btusb bluetooth snd_hda_codec_idt snd_hda_intel carl9170 snd_hda_codec coretemp joydev ath5k snd_hwdep snd_seq isight_firmware ath snd_seq_device snd_pcm applesmc appletouch mac80211 input_polldev snd_timer microcode cfg80211 snd lpc_ich pcspkr i2c_i801 mfd_core soundcore rfkill snd_page_alloc sky2 tpm_infineon virtio_net kvm_intel kvm i915 drm_kms_helper drm i2c_algo_bit i2c_core video [ 446.892385] Pid: 1892, comm: iw Not tainted 3.6.0-rc1-wl+ #296 [ 446.892387] Call Trace: [ 446.892394] [<c0432958>] warn_slowpath_common+0x7c/0x91 [ 446.892398] [<c04399d7>] ? _local_bh_enable_ip+0x38/0xa6 [ 446.892403] [<c04399d7>] ? _local_bh_enable_ip+0x38/0xa6 [ 446.892459] [<f7f9ae3b>] ? mesh_sync_offset_adjust_tbtt+0x95/0x99 [mac80211] [ 446.892464] [<c043298f>] warn_slowpath_null+0x22/0x24 [ 446.892468] [<c04399d7>] _local_bh_enable_ip+0x38/0xa6 [ 446.892473] [<c0439a52>] local_bh_enable_ip+0xd/0xf [ 446.892479] [<c088004f>] _raw_spin_unlock_bh+0x34/0x37 [ 446.892527] [<f7f9ae3b>] mesh_sync_offset_adjust_tbtt+0x95/0x99 [mac80211] [ 446.892569] [<f7f7650f>] ieee80211_beacon_get_tim+0x28f/0x4e0 [mac80211] [ 446.892575] [<c047ceeb>] ? trace_hardirqs_on_caller+0x10e/0x13f [ 446.892591] [<f7fdc541>] ath5k_beacon_update+0x40/0x26b [ath5k] [ 446.892597] [<c047ad67>] ? lock_acquired+0x1f5/0x21e [ 446.892612] [<f7fdf9fb>] ? ath5k_bss_info_changed+0x167/0x1b2 [ath5k] [ 446.892617] [<c087f9ea>] ? _raw_spin_lock_irqsave+0x78/0x82 [ 446.892632] [<f7fdf9fb>] ? ath5k_bss_info_changed+0x167/0x1b2 [ath5k] [ 446.892647] [<f7fdfa09>] ath5k_bss_info_changed+0x175/0x1b2 [ath5k] [ 446.892651] [<c0479dd4>] ? lock_is_held+0x73/0x7b [ 446.892662] [<c0458fd5>] ? __might_sleep+0xa7/0x17a [ 446.892698] [<f7f5d8f7>] ieee80211_bss_info_change_notify+0x1ed/0x21a [mac80211] [ 446.892703] [<c0449875>] ? queue_work+0x24/0x32 [ 446.892718] [<f7fdf894>] ? ath5k_configure_filter+0x163/0x163 [ath5k] [ 446.892766] [<f7f95fa4>] ieee80211_start_mesh+0xb9/0xbd [mac80211] [ 446.892806] [<f7f6e610>] ieee80211_join_mesh+0x10c/0x116 [mac80211] [ 446.892834] [<f7a96b90>] __cfg80211_join_mesh+0x176/0x1b3 [cfg80211] [ 446.892855] [<f7a96c1c>] cfg80211_join_mesh+0x4f/0x6a [cfg80211] [ 446.892875] [<f7a89891>] nl80211_join_mesh+0x1de/0x1ed [cfg80211] [ 446.892908] [<f7a8db99>] ? nl80211_set_wiphy+0x4cf/0x4cf [cfg80211] [ 446.892919] [<c07cfa36>] genl_rcv_msg+0x1d5/0x1f3 [ 446.892940] [<c07cf861>] ? genl_rcv+0x25/0x25 [ 446.892946] [<c07cf009>] netlink_rcv_skb+0x37/0x78 [ 446.892950] [<c07cf85a>] genl_rcv+0x1e/0x25 [ 446.892955] [<c07cebf3>] netlink_unicast+0xc3/0x12d [ 446.892959] [<c07cee46>] netlink_sendmsg+0x1e9/0x213 [ 446.892966] [<c079f282>] sock_sendmsg+0x79/0x96 [ 446.892972] [<c04eb90d>] ? might_fault+0x9d/0xa3 [ 446.892978] [<c07a81d8>] ? copy_from_user+0x8/0xa [ 446.892983] [<c07a852c>] ? verify_iovec+0x43/0x77 [ 446.892987] [<c079f4d8>] __sys_sendmsg+0x180/0x215 [ 446.892993] [<c045f107>] ? sched_clock_cpu+0x134/0x144 [ 446.892997] [<c047992f>] ? trace_hardirqs_off+0xb/0xd [ 446.893002] [<c047bf88>] ? __lock_acquire+0x46b/0xb6e [ 446.893006] [<c047992f>] ? trace_hardirqs_off+0xb/0xd [ 446.893010] [<c045f149>] ? local_clock+0x32/0x49 [ 446.893015] [<c0479ec1>] ? lock_release_holdtime.part.9+0x4b/0x51 [ 446.893020] [<c0479dd4>] ? lock_is_held+0x73/0x7b [ 446.893025] [<c050d127>] ? fcheck_files+0x97/0xcd [ 446.893029] [<c050d4df>] ? fget_light+0x2d/0x81 [ 446.893034] [<c07a01f3>] sys_sendmsg+0x3b/0x52 [ 446.893038] [<c07a07b4>] sys_socketcall+0x238/0x2a2 [ 446.893044] [<c0885edf>] sysenter_do_call+0x12/0x38 [ 446.893047] ---[ end trace a9af5998f929270f ]--- [ 447.627222] [ 447.627232] ================================= [ 447.627237] [ INFO: inconsistent lock state ] [ 447.627244] 3.6.0-rc1-wl+ #296 Tainted: G W [ 447.627248] --------------------------------- [ 447.627253] inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. [ 447.627260] swapper/0/0 [HC0[0]:SC1[1]:HE1:SE0] takes: [ 447.627264] (&(&ah->block)->rlock){+.?...}, at: [<f7fdd2d1>] ath5k_tasklet_beacon+0x91/0xa7 [ath5k] [ 447.627299] {SOFTIRQ-ON-W} state was registered at: [ 447.627304] [<c047cdbf>] mark_held_locks+0x59/0x77 [ 447.627316] [<c047ceeb>] trace_hardirqs_on_caller+0x10e/0x13f [ 447.627324] [<c047cf27>] trace_hardirqs_on+0xb/0xd [ 447.627332] [<c0439a3d>] _local_bh_enable_ip+0x9e/0xa6 [ 447.627342] [<c0439a52>] local_bh_enable_ip+0xd/0xf [ 447.627349] [<c088004f>] _raw_spin_unlock_bh+0x34/0x37 [ 447.627359] [<f7f9ae3b>] mesh_sync_offset_adjust_tbtt+0x95/0x99 [mac80211] [ 447.627451] [<f7f7650f>] ieee80211_beacon_get_tim+0x28f/0x4e0 [mac80211] [ 447.627526] [<f7fdc541>] ath5k_beacon_update+0x40/0x26b [ath5k] [ 447.627547] [<f7fdfa09>] ath5k_bss_info_changed+0x175/0x1b2 [ath5k] [ 447.627569] [<f7f5d8f7>] ieee80211_bss_info_change_notify+0x1ed/0x21a [mac80211] [ 447.627628] [<f7f95fa4>] ieee80211_start_mesh+0xb9/0xbd [mac80211] [ 447.627712] [<f7f6e610>] ieee80211_join_mesh+0x10c/0x116 [mac80211] [ 447.627782] [<f7a96b90>] __cfg80211_join_mesh+0x176/0x1b3 [cfg80211] [ 447.627816] [<f7a96c1c>] cfg80211_join_mesh+0x4f/0x6a [cfg80211] [ 447.627845] [<f7a89891>] nl80211_join_mesh+0x1de/0x1ed [cfg80211] [ 447.627872] [<c07cfa36>] genl_rcv_msg+0x1d5/0x1f3 [ 447.627881] [<c07cf009>] netlink_rcv_skb+0x37/0x78 [ 447.627891] [<c07cf85a>] genl_rcv+0x1e/0x25 [ 447.627898] [<c07cebf3>] netlink_unicast+0xc3/0x12d [ 447.627907] [<c07cee46>] netlink_sendmsg+0x1e9/0x213 [ 447.627915] [<c079f282>] sock_sendmsg+0x79/0x96 [ 447.627926] [<c079f4d8>] __sys_sendmsg+0x180/0x215 [ 447.627934] [<c07a01f3>] sys_sendmsg+0x3b/0x52 [ 447.627941] [<c07a07b4>] sys_socketcall+0x238/0x2a2 [ 447.627949] [<c0885edf>] sysenter_do_call+0x12/0x38 [ 447.627959] irq event stamp: 1929200 [ 447.627963] hardirqs last enabled at (1929200): [<c043a0e9>] tasklet_hi_action+0x3e/0xbf [ 447.627972] hardirqs last disabled at (1929199): [<c043a0c0>] tasklet_hi_action+0x15/0xbf [ 447.627981] softirqs last enabled at (1929196): [<c043999d>] _local_bh_enable+0x12/0x14 [ 447.627989] softirqs last disabled at (1929197): [<c040443b>] do_softirq+0x63/0xb8 [ 447.627999] [ 447.627999] other info that might help us debug this: [ 447.628004] Possible unsafe locking scenario: [ 447.628004] [ 447.628009] CPU0 [ 447.628012] ---- [ 447.628016] lock(&(&ah->block)->rlock); [ 447.628023] <Interrupt> [ 447.628027] lock(&(&ah->block)->rlock); [ 447.628034] [ 447.628034] *** DEADLOCK *** Signed-off-by: Bob Copeland <me@bobcopeland.com> Signed-off-by: John W. Linville <linville@tuxdriver.com> |
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| .. | ||
| appletalk | ||
| arcnet | ||
| bonding | ||
| caif | ||
| can | ||
| cris | ||
| dsa | ||
| ethernet | ||
| fddi | ||
| hamradio | ||
| hippi | ||
| hyperv | ||
| irda | ||
| phy | ||
| plip | ||
| ppp | ||
| slip | ||
| team | ||
| usb | ||
| vmxnet3 | ||
| wan | ||
| wimax | ||
| wireless | ||
| xen-netback | ||
| Kconfig | ||
| LICENSE.SRC | ||
| Makefile | ||
| Space.c | ||
| dummy.c | ||
| eql.c | ||
| ifb.c | ||
| loopback.c | ||
| macvlan.c | ||
| macvtap.c | ||
| mdio.c | ||
| mii.c | ||
| netconsole.c | ||
| rionet.c | ||
| sb1000.c | ||
| sungem_phy.c | ||
| tun.c | ||
| veth.c | ||
| virtio_net.c | ||
| xen-netfront.c | ||