From:   Alexander Wetzel <alexander@wetzel-home.de>
To:     johannes@sipsolutions.net
Cc:     nbd@nbd.name, linux-wireless@vger.kernel.org,
        Alexander Wetzel <alexander@wetzel-home.de>,
        Thomas Mann <rauchwolke@gmx.net>, stable@vger.kernel.org
Subject: [PATCH v2] wifi: mac80211: Serialize ieee80211_handle_wake_tx_queue()
Date:   Wed, 15 Mar 2023 20:07:31 +0100
Message-Id: <20230315190731.145997-1-alexander@wetzel-home.de>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

ieee80211_handle_wake_tx_queue must not run concurrent.
It calls ieee80211_txq_schedule_start() and the drivers migrated to iTXQ
do not expect overlapping drv_tx() calls.

This fixes commit c850e31f79f0 ("wifi: mac80211: add internal handler
for wake_tx_queue"), which introduced ieee80211_handle_wake_tx_queue().
Drivers started to use it with commit a790cc3a4fad ("wifi: mac80211: add
wake_tx_queue callback to drivers").
But only after fixing an independent bug with commit 4444bc2116ae
("wifi: mac80211: Proper mark iTXQs for resumption") problematic
concurrent calls really happened and exposed the initial issue.

Fixes: c850e31f79f0 ("wifi: mac80211: add internal handler for wake_tx_queue")
Reported-by: Thomas Mann <rauchwolke@gmx.net>
Link: https://bugzilla.kernel.org/show_bug.cgi?id=217119
Link: https://lore.kernel.org/r/b8efebc6-4399-d0b8-b2a0-66843314616b@leemhuis.info/
Link: https://lore.kernel.org/r/b7445607128a6b9ed7c17fcdcf3679bfaf4aaea.camel@sipsolutions.net>
CC: <stable@vger.kernel.org>
Signed-off-by: Alexander Wetzel <alexander@wetzel-home.de>
---

V1..V2
Added the missing spinlock Felix pointed out and fixed the commit
references with the feedback from Kalle.
---
 net/mac80211/ieee80211_i.h | 3 +++
 net/mac80211/main.c        | 1 +
 net/mac80211/util.c        | 3 +++
 3 files changed, 7 insertions(+)

diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index ecc232eb1ee8..e082582e0aa2 100644
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -1284,6 +1284,9 @@ struct ieee80211_local {
 	struct list_head active_txqs[IEEE80211_NUM_ACS];
 	u16 schedule_round[IEEE80211_NUM_ACS];
 
+	/* serializes ieee80211_handle_wake_tx_queue */
+	spinlock_t handle_wake_tx_queue_lock;
+
 	u16 airtime_flags;
 	u32 aql_txq_limit_low[IEEE80211_NUM_ACS];
 	u32 aql_txq_limit_high[IEEE80211_NUM_ACS];
diff --git a/net/mac80211/main.c b/net/mac80211/main.c
index 846528850612..3b622f2b787b 100644
--- a/net/mac80211/main.c
+++ b/net/mac80211/main.c
@@ -788,6 +788,7 @@ struct ieee80211_hw *ieee80211_alloc_hw_nm(size_t priv_data_len,
 	spin_lock_init(&local->filter_lock);
 	spin_lock_init(&local->rx_path_lock);
 	spin_lock_init(&local->queue_stop_reason_lock);
+	spin_lock_init(&local->handle_wake_tx_queue_lock);
 
 	for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 		INIT_LIST_HEAD(&local->active_txqs[i]);
diff --git a/net/mac80211/util.c b/net/mac80211/util.c
index 1a28fe5cb614..3aceb3b731bf 100644
--- a/net/mac80211/util.c
+++ b/net/mac80211/util.c
@@ -314,6 +314,8 @@ void ieee80211_handle_wake_tx_queue(struct ieee80211_hw *hw,
 	struct ieee80211_sub_if_data *sdata = vif_to_sdata(txq->vif);
 	struct ieee80211_txq *queue;
 
+	spin_lock(&local->handle_wake_tx_queue_lock);
+
 	/* Use ieee80211_next_txq() for airtime fairness accounting */
 	ieee80211_txq_schedule_start(hw, txq->ac);
 	while ((queue = ieee80211_next_txq(hw, txq->ac))) {
@@ -321,6 +323,7 @@ void ieee80211_handle_wake_tx_queue(struct ieee80211_hw *hw,
 		ieee80211_return_txq(hw, queue, false);
 	}
 	ieee80211_txq_schedule_end(hw, txq->ac);
+	spin_unlock(&local->handle_wake_tx_queue_lock);
 }
 EXPORT_SYMBOL(ieee80211_handle_wake_tx_queue);
 
-- 
2.39.2