[BUG] recursive lock in mwifiex_uninit_sw

[dave]

A firmware crash of the Marvell 88W8897, which are spurious on Microsoft
Surface devices, will unload/reset the device. However this can also 
fail
in more recent kernels, which can cause more problems since the driver
does not unload. This causes programs trying to reach the network or
networking devices to hang which in turn causes a reboot/poweroff to 
hang.

This can happen on the following fedora rawhide kernels:
- 5.12.0-0.rc8.20210423git7af08140979a.193.fc35.x86_64 [1]
- 5.13.0-0.rc1.20210512git88b06399c9c7.15.fc35.x86_64 [2]

The latter seems to be more consistent in triggering this behaviour
(and crashing the firmware). If someone can give me some pointers
I would gladly help and debug this.

I know there is a set of patches for surface devices which address
these firmware crashes [3], however they have not made it upstream
yet and are not in the before mentioned kernels with this issue.

Regards,
Dave

[1]: 
https://gitlab.com/cki-project/kernel-ark/-/commit/bfe9c6281b1e9a08ad94ff76629279326a8483c1
[2]: 
https://gitlab.com/cki-project/kernel-ark/-/commit/b996c16ff61d147d9a02c74d600b4c576aea9f3a
[3]: 
https://github.com/linux-surface/linux-surface/blob/master/patches/5.12/0002-mwifiex.patch

[  440.345579] ============================================
[  440.345583] WARNING: possible recursive locking detected
[  440.345587] 5.13.0-0.rc1.20210512git88b06399c9c7.15.fc35.x86_64 #1 
Not tainted
[  440.345592] --------------------------------------------
[  440.345595] kworker/0:2/121 is trying to acquire lock:
[  440.345599] ffff9bbbc6792670 (&rdev->wiphy.mtx){+.+.}-{3:3}, at: 
cfg80211_netdev_notifier_call+0xf8/0x5c0 [cfg80211]
[  440.345734]
               but task is already holding lock:
[  440.345737] ffff9bbbc6792670 (&rdev->wiphy.mtx){+.+.}-{3:3}, at: 
mwifiex_uninit_sw+0x151/0x1f0 [mwifiex]
[  440.345783]
               other info that might help us debug this:
[  440.345786]  Possible unsafe locking scenario:

[  440.345788]        CPU0
[  440.345790]        ----
[  440.345792]   lock(&rdev->wiphy.mtx);
[  440.345797]   lock(&rdev->wiphy.mtx);
[  440.345801]
                *** DEADLOCK ***

[  440.345804]  May be due to missing lock nesting notation

[  440.345806] 5 locks held by kworker/0:2/121:
[  440.345810]  #0: ffff9bbb80055148 
((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x21a/0x5e0
[  440.345825]  #1: ffffba12814b3e70 
((work_completion)(&card->work)){+.+.}-{0:0}, at: 
process_one_work+0x21a/0x5e0
[  440.345837]  #2: ffff9bbb82263258 (&dev->mutex){....}-{3:3}, at: 
pci_try_reset_function+0x3d/0x90
[  440.345852]  #3: ffffffffa11e7f90 (rtnl_mutex){+.+.}-{3:3}, at: 
mwifiex_uninit_sw+0x146/0x1f0 [mwifiex]
[  440.345879]  #4: ffff9bbbc6792670 (&rdev->wiphy.mtx){+.+.}-{3:3}, at: 
mwifiex_uninit_sw+0x151/0x1f0 [mwifiex]
[  440.345906]
               stack backtrace:
[  440.345909] CPU: 0 PID: 121 Comm: kworker/0:2 Not tainted 
5.13.0-0.rc1.20210512git88b06399c9c7.15.fc35.x86_64 #1
[  440.345915] Hardware name: Microsoft Corporation Surface Pro/Surface 
Pro, BIOS 235.3440.768 11.16.2020
[  440.345919] Workqueue: events mwifiex_pcie_work [mwifiex_pcie]
[  440.345928] Call Trace:
[  440.345935]  dump_stack+0x7f/0xa1
[  440.345943]  __lock_acquire.cold+0x17d/0x2bf
[  440.345953]  ? lock_is_held_type+0xa7/0x120
[  440.345961]  lock_acquire+0xc4/0x3a0
[  440.345967]  ? cfg80211_netdev_notifier_call+0xf8/0x5c0 [cfg80211]
[  440.346062]  ? __bfs+0xf5/0x230
[  440.346069]  ? lock_is_held_type+0xa7/0x120
[  440.346077]  __mutex_lock+0x91/0x830
[  440.346082]  ? cfg80211_netdev_notifier_call+0xf8/0x5c0 [cfg80211]
[  440.346175]  ? __bfs+0xf5/0x230
[  440.346181]  ? cfg80211_netdev_notifier_call+0xf8/0x5c0 [cfg80211]
[  440.346270]  ? check_path.constprop.0+0x24/0x50
[  440.346278]  ? check_noncircular+0x70/0x100
[  440.346286]  ? cfg80211_netdev_notifier_call+0xf8/0x5c0 [cfg80211]
[  440.346375]  cfg80211_netdev_notifier_call+0xf8/0x5c0 [cfg80211]
[  440.346471]  ? __lock_acquire+0x3ac/0x1e10
[  440.346481]  ? lock_acquire+0xc4/0x3a0
[  440.346486]  ? lock_is_held_type+0xa7/0x120
[  440.346492]  ? find_held_lock+0x32/0x90
[  440.346499]  ? sched_clock_cpu+0xc/0xb0
[  440.346505]  ? lock_is_held_type+0xa7/0x120
[  440.346510]  ? cfg80211_register_netdevice+0x130/0x130 [cfg80211]
[  440.346604]  ? rcu_read_lock_sched_held+0x3f/0x80
[  440.346615]  notifier_call_chain+0x42/0xb0
[  440.346624]  __dev_close_many+0x62/0x100
[  440.346634]  dev_close_many+0x7b/0x110
[  440.346641]  unregister_netdevice_many+0x14b/0x760
[  440.346650]  unregister_netdevice_queue+0xab/0xf0
[  440.346658]  _cfg80211_unregister_wdev+0x170/0x210 [cfg80211]
[  440.346752]  mwifiex_del_virtual_intf+0x178/0x1a0 [mwifiex]
[  440.346778]  mwifiex_uninit_sw+0x1d5/0x1f0 [mwifiex]
[  440.346801]  mwifiex_shutdown_sw+0x5c/0x90 [mwifiex]
[  440.346822]  mwifiex_pcie_reset_prepare+0x4d/0x90 [mwifiex_pcie]
[  440.346829]  pci_dev_save_and_disable+0x29/0x50
[  440.346835]  pci_try_reset_function+0x49/0x90
[  440.346840]  process_one_work+0x2b0/0x5e0
[  440.346849]  worker_thread+0x55/0x3c0
[  440.346854]  ? process_one_work+0x5e0/0x5e0
[  440.346860]  kthread+0x13a/0x150
[  440.346865]  ? __kthread_bind_mask+0x60/0x60
[  440.346871]  ret_from_fork+0x22/0x30