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4eb2e16487
linux_dsm_epyc7002/drivers/net/wireless/ath
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Michal Kazior 4eb2e16487 ath10k: avoid possible deadlock with scan timeout 
This should prevent deadlock predicted by the
following splat:

 ======================================================
 [ INFO: possible circular locking dependency detected ]
 3.17.0-wl-ath+ #67 Not tainted
 -------------------------------------------------------
 kworker/u32:1/7230 is trying to acquire lock:
  (&ar->conf_mutex){+.+.+.}, at: [<ffffffffa040a57d>] ath10k_scan_timeout_work+0x2d/0x50 [ath10k_core]

 but task is already holding lock:
  ((&(&ar->scan.timeout)->work)){+.+...}, at: [<ffffffff8106dae1>] process_one_work+0x151/0x470

 which lock already depends on the new lock.

 the existing dependency chain (in reverse order) is:

 -> #1 ((&(&ar->scan.timeout)->work)){+.+...}:
        [<ffffffff810a12e5>] lock_acquire+0x85/0x100
        [<ffffffff8106cb4d>] flush_work+0x3d/0x270
        [<ffffffff8106e49d>] __cancel_work_timer+0x7d/0x110
        [<ffffffff8106e543>] cancel_delayed_work_sync+0x13/0x20
        [<ffffffffa0409f16>] ath10k_cancel_remain_on_channel+0x36/0x60 [ath10k_core]
        [<ffffffffa028c75c>] ieee80211_cancel_roc+0x1cc/0x2f0 [mac80211]
        [<ffffffffa028c8a2>] ieee80211_mgmt_tx_cancel_wait+0x22/0x30 [mac80211]
        [<ffffffffa0132288>] nl80211_tx_mgmt_cancel_wait+0xa8/0x130 [cfg80211]
        [<ffffffff816654a5>] genl_family_rcv_msg+0x1a5/0x3c0
        [<ffffffff81665749>] genl_rcv_msg+0x89/0xc0
        [<ffffffff81664e91>] netlink_rcv_skb+0xb1/0xc0
        [<ffffffff816650bc>] genl_rcv+0x2c/0x40
        [<ffffffff8166474d>] netlink_unicast+0x18d/0x200
        [<ffffffff81664add>] netlink_sendmsg+0x31d/0x430
        [<ffffffff8161a9ac>] sock_sendmsg+0x9c/0xd0
        [<ffffffff8161b469>] ___sys_sendmsg+0x389/0x3a0
        [<ffffffff8161bed9>] __sys_sendmsg+0x49/0x90
        [<ffffffff8161bf32>] SyS_sendmsg+0x12/0x20
        [<ffffffff8174c456>] system_call_fastpath+0x1a/0x1f

 -> #0 (&ar->conf_mutex){+.+.+.}:
        [<ffffffff810a0bde>] __lock_acquire+0x1b6e/0x1ce0
        [<ffffffff810a12e5>] lock_acquire+0x85/0x100
        [<ffffffff817491eb>] mutex_lock_nested+0x4b/0x370
        [<ffffffffa040a57d>] ath10k_scan_timeout_work+0x2d/0x50 [ath10k_core]
        [<ffffffff8106db41>] process_one_work+0x1b1/0x470
        [<ffffffff8106df63>] worker_thread+0x123/0x460
        [<ffffffff81073f34>] kthread+0xe4/0x100
        [<ffffffff8174c3ac>] ret_from_fork+0x7c/0xb0

 other info that might help us debug this:

  Possible unsafe locking scenario:

        CPU0                    CPU1
        ----                    ----
   lock((&(&ar->scan.timeout)->work));
                                lock(&ar->conf_mutex);
                                lock((&(&ar->scan.timeout)->work));
   lock(&ar->conf_mutex);

  *** DEADLOCK ***

Reported-by: Marek Puzyniak <marek.puzyniak@tieto.com>
Signed-off-by: Michal Kazior <michal.kazior@tieto.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>
2014-10-31 02:16:30 +02:00
..
ar5523 mac80211: add vif to flush call 2014-04-09 10:55:29 +02:00
ath5k ath5k: remove redundant null check before kfree() 2014-08-28 14:41:57 -04:00
ath6kl ath: change logging functions to return void 2014-09-29 14:29:23 +03:00
ath9k ath9k: Fix channel context timer 2014-08-28 14:50:13 -04:00
ath10k ath10k: avoid possible deadlock with scan timeout 2014-10-31 02:16:30 +02:00
carl9170 carl9170: tx: Replace rcu_assign_pointer() with RCU_INIT_POINTER() 2014-08-28 14:50:13 -04:00
wcn36xx wcn36xx: remove unnecessary break after goto 2014-07-13 23:45:24 -07:00
wil6210 ath: change logging functions to return void 2014-09-29 14:29:23 +03:00
ath.h ath9k: Add a debug level for channel context 2014-08-28 14:41:57 -04:00
debug.c
dfs_pattern_detector.c ath: add JP DFS pattern detector 2014-05-16 14:26:53 -04:00
dfs_pattern_detector.h ath9k/ath: move dfs pattern detector to ath 2013-10-18 14:03:54 -04:00
dfs_pri_detector.c ath9k/ath: move dfs pattern detector to ath 2013-10-18 14:03:54 -04:00
dfs_pri_detector.h ath9k/ath: move dfs pattern detector to ath 2013-10-18 14:03:54 -04:00
hw.c ath: update hardware mac address with bssid mask 2013-04-22 15:20:15 -04:00
Kconfig ath: add support for proper dynamic regulatory hints 2013-10-18 14:04:41 -04:00
key.c
main.c ath: add common function ath_is_mybeacon 2014-01-16 14:55:44 -05:00
Makefile ath9k/ath: move dfs pattern detector to ath 2013-10-18 14:03:54 -04:00
reg.h ath: update hardware mac address with bssid mask 2013-04-22 15:20:15 -04:00
regd_common.h
regd.c ath: remove camel case from struct reg_dmn_pair_mapping 2014-02-14 13:20:32 +02:00
regd.h
spectral_common.h ath10k: add spectral scan feature 2014-08-04 09:07:54 +03:00