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Message-ID: <b43cfde3-7f33-9153-42ca-9e1ecf409d2a@candelatech.com> Date: Tue, 19 Jul 2022 18:58:34 -0700 From: Ben Greear <greearb@...delatech.com> To: Sasha Levin <sashal@...nel.org>, linux-kernel@...r.kernel.org, stable@...r.kernel.org Cc: Felix Fietkau <nbd@....name>, Toke Høiland-Jørgensen <toke@...nel.org>, Johannes Berg <johannes.berg@...el.com>, johannes@...solutions.net, davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com, linux-wireless@...r.kernel.org, netdev@...r.kernel.org Subject: Re: [PATCH AUTOSEL 5.4 06/16] wifi: mac80211: do not wake queues on a vif that is being stopped I think this one had a regression and needs another init-lock-early patch to keep from causing problems? It certainly broke my 5.17-ish kernel... Thanks, Ben On 7/19/22 6:17 PM, Sasha Levin wrote: > From: Felix Fietkau <nbd@....name> > > [ Upstream commit f856373e2f31ffd340e47e2b00027bd4070f74b3 ] > > When a vif is being removed and sdata->bss is cleared, __ieee80211_wake_txqs > can still be called on it, which crashes as soon as sdata->bss is being > dereferenced. > To fix this properly, check for SDATA_STATE_RUNNING before waking queues, > and take the fq lock when setting it (to ensure that __ieee80211_wake_txqs > observes the change when running on a different CPU) > > Signed-off-by: Felix Fietkau <nbd@....name> > Acked-by: Toke Høiland-Jørgensen <toke@...nel.org> > Link: https://lore.kernel.org/r/20220531190824.60019-1-nbd@nbd.name > Signed-off-by: Johannes Berg <johannes.berg@...el.com> > Signed-off-by: Sasha Levin <sashal@...nel.org> > --- > net/mac80211/iface.c | 2 ++ > net/mac80211/util.c | 3 +++ > 2 files changed, 5 insertions(+) > > diff --git a/net/mac80211/iface.c b/net/mac80211/iface.c > index ddc001ad9055..48bda8aaa90a 100644 > --- a/net/mac80211/iface.c > +++ b/net/mac80211/iface.c > @@ -803,7 +803,9 @@ static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata, > bool cancel_scan; > struct cfg80211_nan_func *func; > > + spin_lock_bh(&local->fq.lock); > clear_bit(SDATA_STATE_RUNNING, &sdata->state); > + spin_unlock_bh(&local->fq.lock); > > cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata; > if (cancel_scan) > diff --git a/net/mac80211/util.c b/net/mac80211/util.c > index c1c117fdf318..8ae0186091b6 100644 > --- a/net/mac80211/util.c > +++ b/net/mac80211/util.c > @@ -250,6 +250,9 @@ static void __ieee80211_wake_txqs(struct ieee80211_sub_if_data *sdata, int ac) > local_bh_disable(); > spin_lock(&fq->lock); > > + if (!test_bit(SDATA_STATE_RUNNING, &sdata->state)) > + goto out; > + > if (sdata->vif.type == NL80211_IFTYPE_AP) > ps = &sdata->bss->ps; > > -- Ben Greear <greearb@...delatech.com> Candela Technologies Inc http://www.candelatech.com
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