On Wed, 2022-09-21 at 17:19 +0800, Aran Dalton wrote: > Both nl80211_new_interface and cfg80211_netdev_notifier_call hold the > same wiphy_lock, then cause deadlock. > > The main call stack as bellow: > > nl80211_new_interface() takes wiphy_lock > -> _nl80211_new_interface: > -> rdev_add_virtual_intf > -> rdev->ops->add_virtual_intf > -> register_netdevice The bug is yours, here, you're no longer allowed to call register_netdevice() here. If you have an out-of-tree driver that we couldn't update when doing tree-wide changes, you probably shouldn't assume that the bug is upstream and send random locking patches ... :) johannes
