From 5af2bb3168db6b0af9988eb25cccf2e3bc4455e2 Mon Sep 17 00:00:00 2001
From: Gregory Greenman <gregory.greenman@intel.com>
Date: Sun, 16 Apr 2023 15:47:26 +0300
Subject: [PATCH] wifi: iwlwifi: call napi_synchronize() before freeing rx/tx queues
Git-commit: 5af2bb3168db6b0af9988eb25cccf2e3bc4455e2
Patch-mainline: v6.4-rc1
References: git-fixes
When rx/tx queues are being freed, on a different CPU there could be
still rx flow running. Call napi_synchronize() to prevent such a race.
Signed-off-by: Gregory Greenman <gregory.greenman@intel.com>
Co-developed-by: Benjamin Berg <benjamin.berg@intel.com>
Signed-off-by: Benjamin Berg <benjamin.berg@intel.com>
Link: https://lore.kernel.org/r/20230416154301.5171ee44dcc1.Iff18718540da412e084e7d8266447d40730600ed@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
.../net/wireless/intel/iwlwifi/pcie/internal.h | 1 +
drivers/net/wireless/intel/iwlwifi/pcie/rx.c | 18 +++++++++++++++++-
.../wireless/intel/iwlwifi/pcie/trans-gen2.c | 1 +
.../net/wireless/intel/iwlwifi/pcie/trans.c | 1 +
4 files changed, 20 insertions(+), 1 deletion(-)
diff --git a/drivers/net/wireless/intel/iwlwifi/pcie/internal.h b/drivers/net/wireless/intel/iwlwifi/pcie/internal.h
index f7e4f868363d..69b95ad5993b 100644
--- a/drivers/net/wireless/intel/iwlwifi/pcie/internal.h
+++ b/drivers/net/wireless/intel/iwlwifi/pcie/internal.h
@@ -497,6 +497,7 @@ int iwl_pcie_rx_stop(struct iwl_trans *trans);
void iwl_pcie_rx_free(struct iwl_trans *trans);
void iwl_pcie_free_rbs_pool(struct iwl_trans *trans);
void iwl_pcie_rx_init_rxb_lists(struct iwl_rxq *rxq);
+void iwl_pcie_rx_napi_sync(struct iwl_trans *trans);
void iwl_pcie_rxq_alloc_rbs(struct iwl_trans *trans, gfp_t priority,
struct iwl_rxq *rxq);
diff --git a/drivers/net/wireless/intel/iwlwifi/pcie/rx.c b/drivers/net/wireless/intel/iwlwifi/pcie/rx.c
index 9c9f87fe8377..0d7890f99a5f 100644
--- a/drivers/net/wireless/intel/iwlwifi/pcie/rx.c
+++ b/drivers/net/wireless/intel/iwlwifi/pcie/rx.c
@@ -1,6 +1,6 @@
// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
/*
- * Copyright (C) 2003-2014, 2018-2022 Intel Corporation
+ * Copyright (C) 2003-2014, 2018-2023 Intel Corporation
* Copyright (C) 2013-2015 Intel Mobile Communications GmbH
* Copyright (C) 2016-2017 Intel Deutschland GmbH
*/
@@ -1053,6 +1053,22 @@ static int iwl_pcie_napi_poll_msix(struct napi_struct *napi, int budget)
return ret;
}
+void iwl_pcie_rx_napi_sync(struct iwl_trans *trans)
+{
+ struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
+ int i;
+
+ if (unlikely(!trans_pcie->rxq))
+ return;
+
+ for (i = 0; i < trans->num_rx_queues; i++) {
+ struct iwl_rxq *rxq = &trans_pcie->rxq[i];
+
+ if (rxq && rxq->napi.poll)
+ napi_synchronize(&rxq->napi);
+ }
+}
+
static int _iwl_pcie_rx_init(struct iwl_trans *trans)
{
struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
diff --git a/drivers/net/wireless/intel/iwlwifi/pcie/trans-gen2.c b/drivers/net/wireless/intel/iwlwifi/pcie/trans-gen2.c
index 45b63e3f5df3..73b395841ca8 100644
--- a/drivers/net/wireless/intel/iwlwifi/pcie/trans-gen2.c
+++ b/drivers/net/wireless/intel/iwlwifi/pcie/trans-gen2.c
@@ -156,6 +156,7 @@ void _iwl_trans_pcie_gen2_stop_device(struct iwl_trans *trans)
if (test_and_clear_bit(STATUS_DEVICE_ENABLED, &trans->status)) {
IWL_DEBUG_INFO(trans,
"DEVICE_ENABLED bit was set and is now cleared\n");
+ iwl_pcie_rx_napi_sync(trans);
iwl_txq_gen2_tx_free(trans);
iwl_pcie_rx_stop(trans);
}
diff --git a/drivers/net/wireless/intel/iwlwifi/pcie/trans.c b/drivers/net/wireless/intel/iwlwifi/pcie/trans.c
index 1b32a4035d88..c5446b82c6c7 100644
--- a/drivers/net/wireless/intel/iwlwifi/pcie/trans.c
+++ b/drivers/net/wireless/intel/iwlwifi/pcie/trans.c
@@ -1260,6 +1260,7 @@ static void _iwl_trans_pcie_stop_device(struct iwl_trans *trans)
if (test_and_clear_bit(STATUS_DEVICE_ENABLED, &trans->status)) {
IWL_DEBUG_INFO(trans,
"DEVICE_ENABLED bit was set and is now cleared\n");
+ iwl_pcie_rx_napi_sync(trans);
iwl_pcie_tx_stop(trans);
iwl_pcie_rx_stop(trans);
--
2.35.3