6.15-stable review patch. If anyone has any objections, please let me know.
------------------
From: Alexander Wetzel Alexander@wetzel-home.de
[ Upstream commit 11e3e22fa533f5d7cf04e32343b05a27eda3c7a5 ]
Ignore TXQs with the flag IEEE80211_TXQ_STOP when scheduling a queue.
The flag is only set after all fragments have been dequeued and won't allow dequeueing other frames as long as the flag is set.
For drivers using ieee80211_txq_schedule_start() this prevents an loop trying to push the queued frames while IEEE80211_TXQ_STOP is set:
After setting IEEE80211_TXQ_STOP the driver will call ieee80211_return_txq(). Which calls __ieee80211_schedule_txq(), detects that there sill are frames in the queue and immediately restarts the stopped TXQ. Which can't dequeue any frame and thus starts over the loop.
Signed-off-by: Alexander Wetzel Alexander@wetzel-home.de Fixes: ba8c3d6f16a1 ("mac80211: add an intermediate software queue implementation") Link: https://patch.msgid.link/20250717162547.94582-2-Alexander@wetzel-home.de Signed-off-by: Johannes Berg johannes.berg@intel.com Signed-off-by: Sasha Levin sashal@kernel.org --- net/mac80211/tx.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c index 695db38ccfb4..fd21a18a028d 100644 --- a/net/mac80211/tx.c +++ b/net/mac80211/tx.c @@ -4109,7 +4109,9 @@ void __ieee80211_schedule_txq(struct ieee80211_hw *hw,
spin_lock_bh(&local->active_txq_lock[txq->ac]);
- has_queue = force || txq_has_queue(txq); + has_queue = force || + (!test_bit(IEEE80211_TXQ_STOP, &txqi->flags) && + txq_has_queue(txq)); if (list_empty(&txqi->schedule_order) && (has_queue || ieee80211_txq_keep_active(txqi))) { /* If airtime accounting is active, always enqueue STAs at the