linux-kernel - [PATCH 5.19 016/101] wifi: mac80211: ensure vif queues are operational after start

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Date:   Mon,  3 Oct 2022 09:10:12 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Alexander Wetzel <alexander@...zel-home.de>,
        Felix Fietkau <nbd@....name>,
        Johannes Berg <johannes.berg@...el.com>
Subject: [PATCH 5.19 016/101] wifi: mac80211: ensure vif queues are operational after start

From: Alexander Wetzel <alexander@...zel-home.de>

commit 527008e5e87600a389feb8a57042c928ecca195d upstream.

Make sure local->queue_stop_reasons and vif.txqs_stopped stay in sync.

When a new vif is created the queues may end up in an inconsistent state
and be inoperable:
Communication not using iTXQ will work, allowing to e.g. complete the
association. But the 4-way handshake will time out. The sta will not
send out any skbs queued in iTXQs.

All normal attempts to start the queues will fail when reaching this
state.
local->queue_stop_reasons will have marked all queues as operational but
vif.txqs_stopped will still be set, creating an inconsistent internal
state.

In reality this seems to be race between the mac80211 function
ieee80211_do_open() setting SDATA_STATE_RUNNING and the wake_txqs_tasklet:
Depending on the driver and the timing the queues may end up to be
operational or not.

Cc: stable@...r.kernel.org
Fixes: f856373e2f31 ("wifi: mac80211: do not wake queues on a vif that is being stopped")
Signed-off-by: Alexander Wetzel <alexander@...zel-home.de>
Acked-by: Felix Fietkau <nbd@....name>
Link: https://lore.kernel.org/r/20220915130946.302803-1-alexander@wetzel-home.de
Signed-off-by: Johannes Berg <johannes.berg@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/mac80211/util.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/mac80211/util.c b/net/mac80211/util.c
index 53826c663723..efcefb2dd882 100644
--- a/net/mac80211/util.c
+++ b/net/mac80211/util.c
@@ -301,14 +301,14 @@ static void __ieee80211_wake_txqs(struct ieee80211_sub_if_data *sdata, int ac)
 	local_bh_disable();
 	spin_lock(&fq->lock);

+	sdata->vif.txqs_stopped[ac] = false;
+
 	if (!test_bit(SDATA_STATE_RUNNING, &sdata->state))
 		goto out;

 	if (sdata->vif.type == NL80211_IFTYPE_AP)
 		ps = &sdata->bss->ps;

-	sdata->vif.txqs_stopped[ac] = false;
-
 	list_for_each_entry_rcu(sta, &local->sta_list, list) {
 		if (sdata != sta->sdata)
 			continue;
-- 
2.37.3