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@xxxxxxx>
Link: https://bugzilla.kernel.org/show_bug.cgi?id=217119
Link: https://lore.kernel.org/r/b8efebc6-4399-d0b8-b2a0-66843314616b@xxxxxxxxxxxxx/
Link: https://lore.kernel.org/r/b7445607128a6b9ed7c17fcdcf3679bfaf4aaea.camel@xxxxxxxxxxxxxxxx>
CC: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Alexander Wetzel <alexander@xxxxxxxxxxxxxx>
---
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
