Drafting the SRU justification for the deadlock fix so kernel team can
pull it into noble / questing:
[Impact]
Systems using the MediaTek MT7925 (RZ717) Wi-Fi 7 chipset suffer from
intermittent hard freezes during AP roaming, multi-link operations or
connection drops.
The issue is an AB-BA deadlock between cfg80211_wiphy_work and mt7925_roc_work
where cancel_work_sync is called while holding the mt76 mutex. Once triggered,
the kernel wedges, wpa_supplicant hangs in D state, and only a hard reset
recovers the system.
[Fix]
Backport the two upstream commits merged into mainline:
- dd08ca3f092f ("wifi: mt76: mt7925: fix potential deadlock in
mt7925_roc_abort_sync")
- 9e4d518a4707 ("wifi: mt76: mt7925: pass mlink to mac_link_sta_remove()")
[Test Plan]
1. Boot kernel with mt7925e driver on hardware with MT7925 (e.g. Framework 16 /
ONEXPLAYER / AMD Ryzen AI).
2. Connect to multi-band WiFi (2.4/5/6 GHz) and trigger rapid roaming or AP
re-association.
3. Verify system does not hang and no D-state processes or lockdep splats
appear in dmesg.
[Where problems could occur]
The changes are strictly isolated to drivers/net/wireless/mediatek/mt76/mt7925/
and ensure mutex locking order is preserved during ROC (remain-on-channel)
abort and STA removal. Regression risk is low and restricted to MT7925 devices
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https://bugs.launchpad.net/bugs/2137291
Title:
mt7925e: Kernel panic NULL pointer dereference in
mt76_connac_mcu_uni_add_dev during WiFi reset - Framework Desktop
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