Patch "wifi: ath10k: Serialize wake_tx_queue ops" has been added to the 6.1-stable tree

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This is a note to let you know that I've just added the patch titled

    wifi: ath10k: Serialize wake_tx_queue ops

to the 6.1-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     wifi-ath10k-serialize-wake_tx_queue-ops.patch
and it can be found in the queue-6.1 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From b719ebc37a1eacd4fd4f1264f731b016e5ec0c6e Mon Sep 17 00:00:00 2001
From: Alexander Wetzel <alexander@xxxxxxxxxxxxxx>
Date: Thu, 23 Mar 2023 17:55:27 +0100
Subject: wifi: ath10k: Serialize wake_tx_queue ops

From: Alexander Wetzel <alexander@xxxxxxxxxxxxxx>

commit b719ebc37a1eacd4fd4f1264f731b016e5ec0c6e upstream.

Serialize the ath10k implementation of the wake_tx_queue ops.
ath10k_mac_op_wake_tx_queue() must not run concurrent since it's using
ieee80211_txq_schedule_start().

The intend of this patch is to sort out an issue discovered in the discussion
referred to by the Link tag.

I can't test it with real hardware and thus just implemented the per-ac queue
lock Felix suggested. One obvious alternative to the per-ac lock would be to
bring back the txqs_lock commit bb2edb733586 ("ath10k: migrate to mac80211 txq
scheduling") dropped.

Fixes: bb2edb733586 ("ath10k: migrate to mac80211 txq scheduling")
Reported-by: Felix Fietkau <nbd@xxxxxxxx>
Link: https://lore.kernel.org/r/519b5bb9-8899-ae7c-4eff-f3116cdfdb56@xxxxxxxx
CC: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Alexander Wetzel <alexander@xxxxxxxxxxxxxx>
Signed-off-by: Kalle Valo <quic_kvalo@xxxxxxxxxxx>
Link: https://lore.kernel.org/r/20230323165527.156414-1-alexander@xxxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/net/wireless/ath/ath10k/core.c |    3 +++
 drivers/net/wireless/ath/ath10k/core.h |    3 +++
 drivers/net/wireless/ath/ath10k/mac.c  |    6 ++++--
 3 files changed, 10 insertions(+), 2 deletions(-)

--- a/drivers/net/wireless/ath/ath10k/core.c
+++ b/drivers/net/wireless/ath/ath10k/core.c
@@ -3634,6 +3634,9 @@ struct ath10k *ath10k_core_create(size_t
 	mutex_init(&ar->dump_mutex);
 	spin_lock_init(&ar->data_lock);
 
+	for (int ac = 0; ac < IEEE80211_NUM_ACS; ac++)
+		spin_lock_init(&ar->queue_lock[ac]);
+
 	INIT_LIST_HEAD(&ar->peers);
 	init_waitqueue_head(&ar->peer_mapping_wq);
 	init_waitqueue_head(&ar->htt.empty_tx_wq);
--- a/drivers/net/wireless/ath/ath10k/core.h
+++ b/drivers/net/wireless/ath/ath10k/core.h
@@ -1170,6 +1170,9 @@ struct ath10k {
 	/* protects shared structure data */
 	spinlock_t data_lock;
 
+	/* serialize wake_tx_queue calls per ac */
+	spinlock_t queue_lock[IEEE80211_NUM_ACS];
+
 	struct list_head arvifs;
 	struct list_head peers;
 	struct ath10k_peer *peer_map[ATH10K_MAX_NUM_PEER_IDS];
--- a/drivers/net/wireless/ath/ath10k/mac.c
+++ b/drivers/net/wireless/ath/ath10k/mac.c
@@ -4732,13 +4732,14 @@ static void ath10k_mac_op_wake_tx_queue(
 {
 	struct ath10k *ar = hw->priv;
 	int ret;
-	u8 ac;
+	u8 ac = txq->ac;
 
 	ath10k_htt_tx_txq_update(hw, txq);
 	if (ar->htt.tx_q_state.mode != HTT_TX_MODE_SWITCH_PUSH)
 		return;
 
-	ac = txq->ac;
+	spin_lock_bh(&ar->queue_lock[ac]);
+
 	ieee80211_txq_schedule_start(hw, ac);
 	txq = ieee80211_next_txq(hw, ac);
 	if (!txq)
@@ -4753,6 +4754,7 @@ static void ath10k_mac_op_wake_tx_queue(
 	ath10k_htt_tx_txq_update(hw, txq);
 out:
 	ieee80211_txq_schedule_end(hw, ac);
+	spin_unlock_bh(&ar->queue_lock[ac]);
 }
 
 /* Must not be called with conf_mutex held as workers can use that also. */


Patches currently in stable-queue which might be from alexander@xxxxxxxxxxxxxx are

queue-6.1/wifi-ath10k-serialize-wake_tx_queue-ops.patch



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