wireless fixes for v6.12-rc6

Another set of fixes, mostly iwlwifi:
  * fix infinite loop in 6 GHz scan if more than
    255 colocated APs were reported
  * revert removal of retry loops for now to work
    around issues with firmware initialization on
    some devices/platforms
  * fix SAR table issues with some BIOSes
  * fix race in suspend/debug collection
  * fix memory leak in fw recovery
  * fix link ID leak in AP mode for older devices
  * fix sending TX power constraints
  * fix link handling in FW restart
 
 And also the stack:
  * fix setting TX power from userspace with the new
    chanctx emulation code for old-style drivers
  * fix a memory corruption bug due to structure
    embedding
  * fix CQM configuration double-free when moving
    between net namespaces
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Merge tag 'wireless-2024-10-29' of https://git.kernel.org/pub/scm/linux/kernel/git/wireless/wireless

Johannes Berg says:

====================
wireless fixes for v6.12-rc6

Another set of fixes, mostly iwlwifi:
 * fix infinite loop in 6 GHz scan if more than
   255 colocated APs were reported
 * revert removal of retry loops for now to work
   around issues with firmware initialization on
   some devices/platforms
 * fix SAR table issues with some BIOSes
 * fix race in suspend/debug collection
 * fix memory leak in fw recovery
 * fix link ID leak in AP mode for older devices
 * fix sending TX power constraints
 * fix link handling in FW restart

And also the stack:
 * fix setting TX power from userspace with the new
   chanctx emulation code for old-style drivers
 * fix a memory corruption bug due to structure
   embedding
 * fix CQM configuration double-free when moving
   between net namespaces

* tag 'wireless-2024-10-29' of https://git.kernel.org/pub/scm/linux/kernel/git/wireless/wireless:
  wifi: mac80211: ieee80211_i: Fix memory corruption bug in struct ieee80211_chanctx
  wifi: iwlwifi: mvm: fix 6 GHz scan construction
  wifi: cfg80211: clear wdev->cqm_config pointer on free
  mac80211: fix user-power when emulating chanctx
  Revert "wifi: iwlwifi: remove retry loops in start"
  wifi: iwlwifi: mvm: don't add default link in fw restart flow
  wifi: iwlwifi: mvm: Fix response handling in iwl_mvm_send_recovery_cmd()
  wifi: iwlwifi: mvm: SAR table alignment
  wifi: iwlwifi: mvm: Use the sync timepoint API in suspend
  wifi: iwlwifi: mvm: really send iwl_txpower_constraints_cmd
  wifi: iwlwifi: mvm: don't leak a link on AP removal
====================

Link: https://patch.msgid.link/20241029093926.13750-3-johannes@sipsolutions.net
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/wireless/intel/iwlwifi/fw/acpi.c

@@ -429,38 +429,28 @@ out_free:
 	return ret;
 }
 
-static int iwl_acpi_sar_set_profile(union acpi_object *table,
+static int
-				    struct iwl_sar_profile *profile,
+iwl_acpi_parse_chains_table(union acpi_object *table,
-				    bool enabled, u8 num_chains,
+			    struct iwl_sar_profile_chain *chains,
-				    u8 num_sub_bands)
+			    u8 num_chains, u8 num_sub_bands)
 {
-	int i, j, idx = 0;
+	for (u8 chain = 0; chain < num_chains; chain++) {
-
+		for (u8 subband = 0; subband < BIOS_SAR_MAX_SUB_BANDS_NUM;
-	/*
+		     subband++) {
-	 * The table from ACPI is flat, but we store it in a
-	 * structured array.
-	 */
-	for (i = 0; i < BIOS_SAR_MAX_CHAINS_PER_PROFILE; i++) {
-		for (j = 0; j < BIOS_SAR_MAX_SUB_BANDS_NUM; j++) {
 			/* if we don't have the values, use the default */
-			if (i >= num_chains || j >= num_sub_bands) {
+			if (subband >= num_sub_bands) {
-				profile->chains[i].subbands[j] = 0;
+				chains[chain].subbands[subband] = 0;
+			} else if (table->type != ACPI_TYPE_INTEGER ||
+				   table->integer.value > U8_MAX) {
+				return -EINVAL;
 			} else {
-				if (table[idx].type != ACPI_TYPE_INTEGER ||
+				chains[chain].subbands[subband] =
-				    table[idx].integer.value > U8_MAX)
+					table->integer.value;
-					return -EINVAL;
+				table++;
-
-				profile->chains[i].subbands[j] =
-					table[idx].integer.value;
-
-				idx++;
 			}
 		}
 	}
 
-	/* Only if all values were valid can the profile be enabled */
-	profile->enabled = enabled;
-
 	return 0;
 }
 
@@ -543,9 +533,11 @@ read_table:
 	/* The profile from WRDS is officially profile 1, but goes
 	 * into sar_profiles[0] (because we don't have a profile 0).
 	 */
-	ret = iwl_acpi_sar_set_profile(table, &fwrt->sar_profiles[0],
+	ret = iwl_acpi_parse_chains_table(table, fwrt->sar_profiles[0].chains,
-				       flags & IWL_SAR_ENABLE_MSK,
+					  num_chains, num_sub_bands);
-				       num_chains, num_sub_bands);
+	if (!ret && flags & IWL_SAR_ENABLE_MSK)
+		fwrt->sar_profiles[0].enabled = true;
+
 out_free:
 	kfree(data);
 	return ret;
@@ -557,7 +549,7 @@ int iwl_acpi_get_ewrd_table(struct iwl_fw_runtime *fwrt)
 	bool enabled;
 	int i, n_profiles, tbl_rev, pos;
 	int ret = 0;
-	u8 num_chains, num_sub_bands;
+	u8 num_sub_bands;
 
 	data = iwl_acpi_get_object(fwrt->dev, ACPI_EWRD_METHOD);
 	if (IS_ERR(data))
@@ -573,7 +565,6 @@ int iwl_acpi_get_ewrd_table(struct iwl_fw_runtime *fwrt)
 			goto out_free;
 		}
 
-		num_chains = ACPI_SAR_NUM_CHAINS_REV2;
 		num_sub_bands = ACPI_SAR_NUM_SUB_BANDS_REV2;
 
 		goto read_table;
@@ -589,7 +580,6 @@ int iwl_acpi_get_ewrd_table(struct iwl_fw_runtime *fwrt)
 			goto out_free;
 		}
 
-		num_chains = ACPI_SAR_NUM_CHAINS_REV1;
 		num_sub_bands = ACPI_SAR_NUM_SUB_BANDS_REV1;
 
 		goto read_table;
@@ -605,7 +595,6 @@ int iwl_acpi_get_ewrd_table(struct iwl_fw_runtime *fwrt)
 			goto out_free;
 		}
 
-		num_chains = ACPI_SAR_NUM_CHAINS_REV0;
 		num_sub_bands = ACPI_SAR_NUM_SUB_BANDS_REV0;
 
 		goto read_table;
@@ -637,23 +626,54 @@ read_table:
 	/* the tables start at element 3 */
 	pos = 3;
 
+	BUILD_BUG_ON(ACPI_SAR_NUM_CHAINS_REV0 != ACPI_SAR_NUM_CHAINS_REV1);
+	BUILD_BUG_ON(ACPI_SAR_NUM_CHAINS_REV2 != 2 * ACPI_SAR_NUM_CHAINS_REV0);
+
+	/* parse non-cdb chains for all profiles */
 	for (i = 0; i < n_profiles; i++) {
 		union acpi_object *table = &wifi_pkg->package.elements[pos];
+
 		/* The EWRD profiles officially go from 2 to 4, but we
 		 * save them in sar_profiles[1-3] (because we don't
 		 * have profile 0).  So in the array we start from 1.
 		 */
-		ret = iwl_acpi_sar_set_profile(table,
+		ret = iwl_acpi_parse_chains_table(table,
-					       &fwrt->sar_profiles[i + 1],
+						  fwrt->sar_profiles[i + 1].chains,
-					       enabled, num_chains,
+						  ACPI_SAR_NUM_CHAINS_REV0,
-					       num_sub_bands);
+						  num_sub_bands);
 		if (ret < 0)
-			break;
+			goto out_free;
 
 		/* go to the next table */
-		pos += num_chains * num_sub_bands;
+		pos += ACPI_SAR_NUM_CHAINS_REV0 * num_sub_bands;
 	}
 
+	/* non-cdb table revisions */
+	if (tbl_rev < 2)
+		goto set_enabled;
+
+	/* parse cdb chains for all profiles */
+	for (i = 0; i < n_profiles; i++) {
+		struct iwl_sar_profile_chain *chains;
+		union acpi_object *table;
+
+		table = &wifi_pkg->package.elements[pos];
+		chains = &fwrt->sar_profiles[i + 1].chains[ACPI_SAR_NUM_CHAINS_REV0];
+		ret = iwl_acpi_parse_chains_table(table,
+						  chains,
+						  ACPI_SAR_NUM_CHAINS_REV0,
+						  num_sub_bands);
+		if (ret < 0)
+			goto out_free;
+
+		/* go to the next table */
+		pos += ACPI_SAR_NUM_CHAINS_REV0 * num_sub_bands;
+	}
+
+set_enabled:
+	for (i = 0; i < n_profiles; i++)
+		fwrt->sar_profiles[i + 1].enabled = enabled;
+
 out_free:
 	kfree(data);
 	return ret;

drivers/net/wireless/intel/iwlwifi/fw/init.c

@@ -39,10 +39,12 @@ void iwl_fw_runtime_init(struct iwl_fw_runtime *fwrt, struct iwl_trans *trans,
 }
 IWL_EXPORT_SYMBOL(iwl_fw_runtime_init);
 
+/* Assumes the appropriate lock is held by the caller */
 void iwl_fw_runtime_suspend(struct iwl_fw_runtime *fwrt)
 {
 	iwl_fw_suspend_timestamp(fwrt);
-	iwl_dbg_tlv_time_point(fwrt, IWL_FW_INI_TIME_POINT_HOST_D3_START, NULL);
+	iwl_dbg_tlv_time_point_sync(fwrt, IWL_FW_INI_TIME_POINT_HOST_D3_START,
+				    NULL);
 }
 IWL_EXPORT_SYMBOL(iwl_fw_runtime_suspend);
 

drivers/net/wireless/intel/iwlwifi/iwl-drv.c

@@ -1413,26 +1413,36 @@ _iwl_op_mode_start(struct iwl_drv *drv, struct iwlwifi_opmode_table *op)
 	const struct iwl_op_mode_ops *ops = op->ops;
 	struct dentry *dbgfs_dir = NULL;
 	struct iwl_op_mode *op_mode = NULL;
+	int retry, max_retry = !!iwlwifi_mod_params.fw_restart * IWL_MAX_INIT_RETRY;
 
 	/* also protects start/stop from racing against each other */
 	lockdep_assert_held(&iwlwifi_opmode_table_mtx);
 
-#ifdef CONFIG_IWLWIFI_DEBUGFS
+	for (retry = 0; retry <= max_retry; retry++) {
-	drv->dbgfs_op_mode = debugfs_create_dir(op->name,
-						drv->dbgfs_drv);
-	dbgfs_dir = drv->dbgfs_op_mode;
-#endif
-
-	op_mode = ops->start(drv->trans, drv->trans->cfg,
-			     &drv->fw, dbgfs_dir);
-	if (op_mode)
-		return op_mode;
 
 #ifdef CONFIG_IWLWIFI_DEBUGFS
-	debugfs_remove_recursive(drv->dbgfs_op_mode);
+		drv->dbgfs_op_mode = debugfs_create_dir(op->name,
-	drv->dbgfs_op_mode = NULL;
+							drv->dbgfs_drv);
+		dbgfs_dir = drv->dbgfs_op_mode;
 #endif
 
+		op_mode = ops->start(drv->trans, drv->trans->cfg,
+				     &drv->fw, dbgfs_dir);
+
+		if (op_mode)
+			return op_mode;
+
+		if (test_bit(STATUS_TRANS_DEAD, &drv->trans->status))
+			break;
+
+		IWL_ERR(drv, "retry init count %d\n", retry);
+
+#ifdef CONFIG_IWLWIFI_DEBUGFS
+		debugfs_remove_recursive(drv->dbgfs_op_mode);
+		drv->dbgfs_op_mode = NULL;
+#endif
+	}
+
 	return NULL;
 }
 

drivers/net/wireless/intel/iwlwifi/iwl-drv.h

@@ -98,6 +98,9 @@ void iwl_drv_stop(struct iwl_drv *drv);
 #define VISIBLE_IF_IWLWIFI_KUNIT static
 #endif
 
+/* max retry for init flow */
+#define IWL_MAX_INIT_RETRY 2
+
 #define FW_NAME_PRE_BUFSIZE	64
 struct iwl_trans;
 const char *iwl_drv_get_fwname_pre(struct iwl_trans *trans, char *buf);

drivers/net/wireless/intel/iwlwifi/mvm/d3.c

@@ -1398,7 +1398,9 @@ int iwl_mvm_suspend(struct ieee80211_hw *hw, struct cfg80211_wowlan *wowlan)
 
 	iwl_mvm_pause_tcm(mvm, true);
 
+	mutex_lock(&mvm->mutex);
 	iwl_fw_runtime_suspend(&mvm->fwrt);
+	mutex_unlock(&mvm->mutex);
 
 	return __iwl_mvm_suspend(hw, wowlan, false);
 }

drivers/net/wireless/intel/iwlwifi/mvm/fw.c

@@ -1307,8 +1307,8 @@ static void iwl_mvm_disconnect_iterator(void *data, u8 *mac,
 void iwl_mvm_send_recovery_cmd(struct iwl_mvm *mvm, u32 flags)
 {
 	u32 error_log_size = mvm->fw->ucode_capa.error_log_size;
+	u32 status = 0;
 	int ret;
-	u32 resp;
 
 	struct iwl_fw_error_recovery_cmd recovery_cmd = {
 		.flags = cpu_to_le32(flags),
@@ -1316,7 +1316,6 @@ void iwl_mvm_send_recovery_cmd(struct iwl_mvm *mvm, u32 flags)
 	};
 	struct iwl_host_cmd host_cmd = {
 		.id = WIDE_ID(SYSTEM_GROUP, FW_ERROR_RECOVERY_CMD),
-		.flags = CMD_WANT_SKB,
 		.data = {&recovery_cmd, },
 		.len = {sizeof(recovery_cmd), },
 	};
@@ -1336,7 +1335,7 @@ void iwl_mvm_send_recovery_cmd(struct iwl_mvm *mvm, u32 flags)
 		recovery_cmd.buf_size = cpu_to_le32(error_log_size);
 	}
 
-	ret = iwl_mvm_send_cmd(mvm, &host_cmd);
+	ret = iwl_mvm_send_cmd_status(mvm, &host_cmd, &status);
 	kfree(mvm->error_recovery_buf);
 	mvm->error_recovery_buf = NULL;
 
@@ -1347,11 +1346,10 @@ void iwl_mvm_send_recovery_cmd(struct iwl_mvm *mvm, u32 flags)
 
 	/* skb respond is only relevant in ERROR_RECOVERY_UPDATE_DB */
 	if (flags & ERROR_RECOVERY_UPDATE_DB) {
-		resp = le32_to_cpu(*(__le32 *)host_cmd.resp_pkt->data);
+		if (status) {
-		if (resp) {
 			IWL_ERR(mvm,
 				"Failed to send recovery cmd blob was invalid %d\n",
-				resp);
+				status);
 
 			ieee80211_iterate_interfaces(mvm->hw, 0,
 						     iwl_mvm_disconnect_iterator,

drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c

@@ -1293,12 +1293,14 @@ int iwl_mvm_mac_start(struct ieee80211_hw *hw)
 {
 	struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw);
 	int ret;
+	int retry, max_retry = 0;
 
 	mutex_lock(&mvm->mutex);
 
 	/* we are starting the mac not in error flow, and restart is enabled */
 	if (!test_bit(IWL_MVM_STATUS_HW_RESTART_REQUESTED, &mvm->status) &&
 	    iwlwifi_mod_params.fw_restart) {
+		max_retry = IWL_MAX_INIT_RETRY;
 		/*
 		 * This will prevent mac80211 recovery flows to trigger during
 		 * init failures
@@ -1306,7 +1308,13 @@ int iwl_mvm_mac_start(struct ieee80211_hw *hw)
 		set_bit(IWL_MVM_STATUS_STARTING, &mvm->status);
 	}
 
-	ret = __iwl_mvm_mac_start(mvm);
+	for (retry = 0; retry <= max_retry; retry++) {
+		ret = __iwl_mvm_mac_start(mvm);
+		if (!ret)
+			break;
+
+		IWL_ERR(mvm, "mac start retry %d\n", retry);
+	}
 	clear_bit(IWL_MVM_STATUS_STARTING, &mvm->status);
 
 	mutex_unlock(&mvm->mutex);
@@ -1970,7 +1978,6 @@ static void iwl_mvm_mac_remove_interface(struct ieee80211_hw *hw,
 		mvm->p2p_device_vif = NULL;
 	}
 
-	iwl_mvm_unset_link_mapping(mvm, vif, &vif->bss_conf);
 	iwl_mvm_mac_ctxt_remove(mvm, vif);
 
 	RCU_INIT_POINTER(mvm->vif_id_to_mac[mvmvif->id], NULL);
@@ -1979,6 +1986,7 @@ static void iwl_mvm_mac_remove_interface(struct ieee80211_hw *hw,
 		mvm->monitor_on = false;
 
 out:
+	iwl_mvm_unset_link_mapping(mvm, vif, &vif->bss_conf);
 	if (vif->type == NL80211_IFTYPE_AP ||
 	    vif->type == NL80211_IFTYPE_ADHOC) {
 		iwl_mvm_dealloc_int_sta(mvm, &mvmvif->deflink.mcast_sta);

drivers/net/wireless/intel/iwlwifi/mvm/mld-mac80211.c

@@ -41,8 +41,6 @@ static int iwl_mvm_mld_mac_add_interface(struct ieee80211_hw *hw,
 	/* reset deflink MLO parameters */
 	mvmvif->deflink.fw_link_id = IWL_MVM_FW_LINK_ID_INVALID;
 	mvmvif->deflink.active = 0;
-	/* the first link always points to the default one */
-	mvmvif->link[0] = &mvmvif->deflink;
 
 	ret = iwl_mvm_mld_mac_ctxt_add(mvm, vif);
 	if (ret)
@@ -60,9 +58,19 @@ static int iwl_mvm_mld_mac_add_interface(struct ieee80211_hw *hw,
 				     IEEE80211_VIF_SUPPORTS_CQM_RSSI;
 	}
 
-	ret = iwl_mvm_add_link(mvm, vif, &vif->bss_conf);
+	/* We want link[0] to point to the default link, unless we have MLO and
-	if (ret)
+	 * in this case this will be modified later by .change_vif_links()
-		goto out_free_bf;
+	 * If we are in the restart flow with an MLD connection, we will wait
+	 * to .change_vif_links() to setup the links.
+	 */
+	if (!test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status) ||
+	    !ieee80211_vif_is_mld(vif)) {
+		mvmvif->link[0] = &mvmvif->deflink;
+
+		ret = iwl_mvm_add_link(mvm, vif, &vif->bss_conf);
+		if (ret)
+			goto out_free_bf;
+	}
 
 	/* Save a pointer to p2p device vif, so it can later be used to
 	 * update the p2p device MAC when a GO is started/stopped
@@ -350,11 +358,6 @@ __iwl_mvm_mld_assign_vif_chanctx(struct iwl_mvm *mvm,
 		rcu_read_unlock();
 	}
 
-	if (vif->type == NL80211_IFTYPE_STATION)
-		iwl_mvm_send_ap_tx_power_constraint_cmd(mvm, vif,
-							link_conf,
-							false);
-
 	/* then activate */
 	ret = iwl_mvm_link_changed(mvm, vif, link_conf,
 				   LINK_CONTEXT_MODIFY_ACTIVE |
@@ -363,6 +366,11 @@ __iwl_mvm_mld_assign_vif_chanctx(struct iwl_mvm *mvm,
 	if (ret)
 		goto out;
 
+	if (vif->type == NL80211_IFTYPE_STATION)
+		iwl_mvm_send_ap_tx_power_constraint_cmd(mvm, vif,
+							link_conf,
+							false);
+
 	/*
 	 * Power state must be updated before quotas,
 	 * otherwise fw will complain.
@@ -1194,7 +1202,11 @@ iwl_mvm_mld_change_vif_links(struct ieee80211_hw *hw,
 
 	mutex_lock(&mvm->mutex);
 
-	if (old_links == 0) {
+	/* If we're in RESTART flow, the default link wasn't added in
+         * drv_add_interface(), and link[0] doesn't point to it.
+	 */
+	if (old_links == 0 && !test_bit(IWL_MVM_STATUS_IN_HW_RESTART,
+					&mvm->status)) {
 		err = iwl_mvm_disable_link(mvm, vif, &vif->bss_conf);
 		if (err)
 			goto out_err;

drivers/net/wireless/intel/iwlwifi/mvm/scan.c

@@ -1774,7 +1774,7 @@ iwl_mvm_umac_scan_cfg_channels_v7_6g(struct iwl_mvm *mvm,
 			&cp->channel_config[ch_cnt];
 
 		u32 s_ssid_bitmap = 0, bssid_bitmap = 0, flags = 0;
-		u8 j, k, n_s_ssids = 0, n_bssids = 0;
+		u8 k, n_s_ssids = 0, n_bssids = 0;
 		u8 max_s_ssids, max_bssids;
 		bool force_passive = false, found = false, allow_passive = true,
 		     unsolicited_probe_on_chan = false, psc_no_listen = false;
@@ -1799,7 +1799,7 @@ iwl_mvm_umac_scan_cfg_channels_v7_6g(struct iwl_mvm *mvm,
 		cfg->v5.iter_count = 1;
 		cfg->v5.iter_interval = 0;
 
-		for (j = 0; j < params->n_6ghz_params; j++) {
+		for (u32 j = 0; j < params->n_6ghz_params; j++) {
 			s8 tmp_psd_20;
 
 			if (!(scan_6ghz_params[j].channel_idx == i))
@@ -1873,7 +1873,7 @@ iwl_mvm_umac_scan_cfg_channels_v7_6g(struct iwl_mvm *mvm,
 		 * SSID.
 		 * TODO: improve this logic
 		 */
-		for (j = 0; j < params->n_6ghz_params; j++) {
+		for (u32 j = 0; j < params->n_6ghz_params; j++) {
 			if (!(scan_6ghz_params[j].channel_idx == i))
 				continue;
 

net/mac80211/ieee80211_i.h

@@ -892,9 +892,10 @@ struct ieee80211_chanctx {
 	/* temporary data for search algorithm etc. */
 	struct ieee80211_chan_req req;
 
-	struct ieee80211_chanctx_conf conf;
-
 	bool radar_detected;
+
+	/* MUST be last - ends in a flexible-array member. */
+	struct ieee80211_chanctx_conf conf;
 };
 
 struct mac80211_qos_map {

net/mac80211/main.c

@@ -167,6 +167,8 @@ static u32 ieee80211_calc_hw_conf_chan(struct ieee80211_local *local,
 	}
 
 	power = ieee80211_chandef_max_power(&chandef);
+	if (local->user_power_level != IEEE80211_UNSET_POWER_LEVEL)
+		power = min(local->user_power_level, power);
 
 	rcu_read_lock();
 	list_for_each_entry_rcu(sdata, &local->interfaces, list) {

net/wireless/core.c

@@ -1236,6 +1236,7 @@ static void _cfg80211_unregister_wdev(struct wireless_dev *wdev,
 	/* deleted from the list, so can't be found from nl80211 any more */
 	cqm_config = rcu_access_pointer(wdev->cqm_config);
 	kfree_rcu(cqm_config, rcu_head);
+	RCU_INIT_POINTER(wdev->cqm_config, NULL);
 
 	/*
 	 * Ensure that all events have been processed and