linux-kernel - [PATCH 6.1.y] wifi: iwlwifi: mvm: ensure offloading TID queue exists

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Message-ID: <20250324072433.3796220-1-jianqi.ren.cn@windriver.com>
Date: Mon, 24 Mar 2025 15:24:33 +0800
From: <jianqi.ren.cn@...driver.com>
To: <stable@...r.kernel.org>
CC: <patches@...ts.linux.dev>, <gregkh@...uxfoundation.org>,
        <linux-kernel@...r.kernel.org>, <jianqi.ren.cn@...driver.com>,
        <gregory.greenman@...el.com>, <kvalo@...nel.org>,
        <johannes.berg@...el.com>, <sashal@...nel.org>,
        <miriam.rachel.korenblit@...el.com>, <yedidya.ben.shimol@...el.com>,
        <daniel.gabay@...el.com>, <shaul.triebitz@...el.com>,
        <benjamin.berg@...el.com>, <linux-wireless@...r.kernel.org>
Subject: [PATCH 6.1.y] wifi: iwlwifi: mvm: ensure offloading TID queue exists

From: Benjamin Berg <benjamin.berg@...el.com>

[ Upstream commit 78f65fbf421a61894c14a1b91fe2fb4437b3fe5f ]

The resume code path assumes that the TX queue for the offloading TID
has been configured. At resume time it then tries to sync the write
pointer as it may have been updated by the firmware.

In the unusual event that no packets have been send on TID 0, the queue
will not have been allocated and this causes a crash. Fix this by
ensuring the queue exist at suspend time.

Signed-off-by: Benjamin Berg <benjamin.berg@...el.com>
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@...el.com>
Link: https://msgid.link/20240218194912.6632e6dc7b35.Ie6e6a7488c9c7d4529f13d48f752b5439d8ac3c4@changeid
Signed-off-by: Johannes Berg <johannes.berg@...el.com>
Signed-off-by: Jianqi Ren <jianqi.ren.cn@...driver.com>
Signed-off-by: He Zhe <zhe.he@...driver.com>
---
Verified the build test
---
 drivers/net/wireless/intel/iwlwifi/mvm/d3.c  |  9 ++++++-
 drivers/net/wireless/intel/iwlwifi/mvm/sta.c | 28 ++++++++++++++++++++
 drivers/net/wireless/intel/iwlwifi/mvm/sta.h |  3 ++-
 3 files changed, 38 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/d3.c b/drivers/net/wireless/intel/iwlwifi/mvm/d3.c
index 53302c29c229..f8af851474e5 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/d3.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/d3.c
@@ -1286,7 +1286,9 @@ static int __iwl_mvm_suspend(struct ieee80211_hw *hw,
 
 		mvm->net_detect = true;
 	} else {
-		struct iwl_wowlan_config_cmd wowlan_config_cmd = {};
+		struct iwl_wowlan_config_cmd wowlan_config_cmd = {
+			.offloading_tid = 0,
+		};
 
 		wowlan_config_cmd.sta_id = mvmvif->ap_sta_id;
 
@@ -1298,6 +1300,11 @@ static int __iwl_mvm_suspend(struct ieee80211_hw *hw,
 			goto out_noreset;
 		}
 
+		ret = iwl_mvm_sta_ensure_queue(
+			mvm, ap_sta->txq[wowlan_config_cmd.offloading_tid]);
+		if (ret)
+			goto out_noreset;
+
 		ret = iwl_mvm_get_wowlan_config(mvm, wowlan, &wowlan_config_cmd,
 						vif, mvmvif, ap_sta);
 		if (ret)
diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/sta.c b/drivers/net/wireless/intel/iwlwifi/mvm/sta.c
index 6b52afcf0272..46bf158eb4b3 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/sta.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/sta.c
@@ -1419,6 +1419,34 @@ static int iwl_mvm_sta_alloc_queue(struct iwl_mvm *mvm,
 	return ret;
 }
 
+int iwl_mvm_sta_ensure_queue(struct iwl_mvm *mvm,
+			     struct ieee80211_txq *txq)
+{
+	struct iwl_mvm_txq *mvmtxq = iwl_mvm_txq_from_mac80211(txq);
+	int ret = -EINVAL;
+
+	lockdep_assert_held(&mvm->mutex);
+
+	if (likely(test_bit(IWL_MVM_TXQ_STATE_READY, &mvmtxq->state)) ||
+	    !txq->sta) {
+		return 0;
+	}
+
+	if (!iwl_mvm_sta_alloc_queue(mvm, txq->sta, txq->ac, txq->tid)) {
+		set_bit(IWL_MVM_TXQ_STATE_READY, &mvmtxq->state);
+		ret = 0;
+	}
+
+	local_bh_disable();
+	spin_lock(&mvm->add_stream_lock);
+	if (!list_empty(&mvmtxq->list))
+		list_del_init(&mvmtxq->list);
+	spin_unlock(&mvm->add_stream_lock);
+	local_bh_enable();
+
+	return ret;
+}
+
 void iwl_mvm_add_new_dqa_stream_wk(struct work_struct *wk)
 {
 	struct iwl_mvm *mvm = container_of(wk, struct iwl_mvm,
diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/sta.h b/drivers/net/wireless/intel/iwlwifi/mvm/sta.h
index f1a4fc3e4038..5f7e9311e7e5 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/sta.h
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/sta.h
@@ -1,6 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */
 /*
- * Copyright (C) 2012-2014, 2018-2021 Intel Corporation
+ * Copyright (C) 2012-2014, 2018-2024 Intel Corporation
  * Copyright (C) 2013-2014 Intel Mobile Communications GmbH
  * Copyright (C) 2015-2016 Intel Deutschland GmbH
  */
@@ -544,6 +544,7 @@ void iwl_mvm_modify_all_sta_disable_tx(struct iwl_mvm *mvm,
 				       struct iwl_mvm_vif *mvmvif,
 				       bool disable);
 void iwl_mvm_csa_client_absent(struct iwl_mvm *mvm, struct ieee80211_vif *vif);
+int iwl_mvm_sta_ensure_queue(struct iwl_mvm *mvm, struct ieee80211_txq *txq);
 void iwl_mvm_add_new_dqa_stream_wk(struct work_struct *wk);
 int iwl_mvm_add_pasn_sta(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
 			 struct iwl_mvm_int_sta *sta, u8 *addr, u32 cipher,
-- 
2.25.1