kernel lock debugging reports suspicious RCU usage

On MT7622 running in station mode, I'm seeing this on association with AP:

[  121.868215] wlan1: authenticated
[  121.876029] wlan1: associate with xx:xx:xx:xx:xx:xx (try 1/3)
[  121.898810] wlan1: RX AssocResp from xx:xx:xx:xx:xx:xx (capab=0x411 status=0 aid=5)
[  121.909127] 
[  121.910811] =============================
[  121.914972] WARNING: suspicious RCU usage
[  121.919193] 5.10.28 #0 Tainted: G S               
[  121.924072] -----------------------------
[  121.928170] target-aarch64_cortex-a53_musl/linux-mediatek_mt7622/mt76-2021-04-11-bf45b30d/mt7615/main.c:675 suspicious rcu_dereference_check() usage!
[  121.941659] 
[  121.941659] other info that might help us debug this:
[  121.941659] 
[  121.949770] 
[  121.949770] rcu_scheduler_active = 2, debug_locks = 1
[  121.956382] 4 locks held by kworker/u4:3/260:
[  121.960830]  #0: ffffff8003e00d38 ((wq_completion)phy1){+.+.}-{0:0}, at: process_one_work+0x1f8/0x6a8
[  121.970249]  #1: ffffffc011f4bdd8 ((work_completion)(&sdata->work)){+.+.}-{0:0}, at: process_one_work+0x1f8/0x6a8
[  121.980679]  #2: ffffff8006590c40 (&wdev->mtx){+.+.}-{3:3}, at: ieee80211_sta_rx_queued_mgmt+0x3c/0x7b0 [mac80211]
[  121.991429]  #3: ffffff8006199d10 (&local->sta_mtx){+.+.}-{3:3}, at: cleanup_module+0x91c/0x22cc [mac80211]
[  122.001459] 
[  122.001459] stack backtrace:
[  122.005917] CPU: 1 PID: 260 Comm: kworker/u4:3 Tainted: G S                5.10.28 #0
[  122.013759] Hardware name: Bananapi BPI-R64 (DT)
[  122.018448] Workqueue: phy1 ieee80211_ibss_leave [mac80211]
[  122.024039] Call trace:
[  122.026499]  dump_backtrace+0x0/0x1a8
[  122.030167]  show_stack+0x14/0x20
[  122.033490]  dump_stack+0xec/0x134
[  122.036897]  lockdep_rcu_suspicious+0xcc/0xdc
[  122.041269]  mt7615_mac_sta_remove+0xbc8/0x1ce8 [mt7615_common]
[  122.047234]  drv_sta_state+0x400/0xbc8 [mac80211]
[  122.051980]  sta_info_move_state+0x1a0/0x2c8 [mac80211]
[  122.057243]  cleanup_module+0xad8/0x22cc [mac80211]
[  122.062158]  ieee80211_recalc_ps_vif+0x1c7c/0x1d20 [mac80211]
[  122.067941]  ieee80211_sta_rx_queued_mgmt+0x2b8/0x7b0 [mac80211]
[  122.073984]  ieee80211_ibss_leave+0xc2c/0x1b78 [mac80211]
[  122.079390]  process_one_work+0x2a0/0x6a8
[  122.083405]  worker_thread+0x40/0x430
[  122.087074]  kthread+0x138/0x140
[  122.090308]  ret_from_fork+0x10/0x18
[  122.095848] wlan1: associated

Start with main.c:675 and the mt7615_mac_sta_remove() call in the provided trace. Reproduce association on an MT7622 in station mode and inspect the surrounding RCU and lock context. Done means the suspicious RCU warning no longer appears during association without regressing the connection.