mac80211: backport tx queueing bugfixes add a bug fix for a rare crash

Re-introduce the queue wake fix that was reverted due to a regression,
but this time with the follow-up fixes that take care of the regression.

Signed-off-by: Felix Fietkau <nbd@nbd.name>
(cherry picked from commit 9a93b62f315ad4c9f021c414ed80ba337ab4a01e)
(cherry-picked from commit 8b804cae5e039142bc63896a75f15146eca3bebc)
(cherry-picked from commit 8b06e06832ebe757246582b65306ad2a2537741f)

1 files changed, 47 insertions, 0 deletions

diff --git a/package/kernel/mac80211/patches/subsys/342-mac80211-Ensure-vif-queues-are-operational-after-sta.patch b/package/kernel/mac80211/patches/subsys/342-mac80211-Ensure-vif-queues-are-operational-after-sta.patch
new file mode 100644
index 0000000000..4310329319
--- /dev/null
+++ b/package/kernel/mac80211/patches/subsys/342-mac80211-Ensure-vif-queues-are-operational-after-sta.patch
@@ -0,0 +1,47 @@
+From: Alexander Wetzel <alexander@wetzel-home.de>
+Date: Thu, 15 Sep 2022 15:09:46 +0200
+Subject: [PATCH] mac80211: Ensure vif queues are operational after start
+
+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@vger.kernel.org
+Fixes: f856373e2f31 ("wifi: mac80211: do not wake queues on a vif that is being stopped")
+Signed-off-by: Alexander Wetzel <alexander@wetzel-home.de>
+---
+
+--- a/net/mac80211/util.c
++++ b/net/mac80211/util.c
+@@ -301,14 +301,14 @@ static void __ieee80211_wake_txqs(struct
+ 	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;