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Tetsuo Handa
aa40d5a435
lockdep complains use of uninitialized spinlock at ieee80211_do_stop() [1], for commitf856373e2f("wifi: mac80211: do not wake queues on a vif that is being stopped") guards clear_bit() using fq.lock even before fq_init() from ieee80211_txq_setup_flows() initializes this spinlock. According to discussion [2], Toke was not happy with expanding usage of fq.lock. Since __ieee80211_wake_txqs() is called under RCU read lock, we can instead use synchronize_rcu() for flushing ieee80211_wake_txqs(). Link: https://syzkaller.appspot.com/bug?extid=eceab52db7c4b961e9d6 [1] Link: https://lkml.kernel.org/r/[email protected] [2] Reported-by: syzbot <[email protected]> Signed-off-by: Tetsuo Handa <[email protected]> Fixes:f856373e2f("wifi: mac80211: do not wake queues on a vif that is being stopped") Tested-by: syzbot <[email protected]> Acked-by: Toke Høiland-Jørgensen <[email protected]> Signed-off-by: Kalle Valo <[email protected]> Link: https://lore.kernel.org/r/[email protected] [ pick up commit3598cb6e18("wifi: mac80211: do not abuse fq.lock in ieee80211_do_stop()") from -next] Link: https://lore.kernel.org/all/[email protected]/ Signed-off-by: Jakub Kicinski <[email protected]>