wifi: iwlwifi: return ERR_PTR from opmode start()

In order to restrict the retry loops for timeouts, first
pass the error code up using ERR_PTR(). This of course
requires all existing functions to be updated accordingly.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>
Link: https://patch.msgid.link/20241227095718.3fe5031d5784.I7307996c91dac69619ff9c616b8a077423fac19f@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

drivers/net/wireless/intel/iwlwifi/dvm/main.c

@@ -1241,7 +1241,7 @@ static struct iwl_op_mode *iwl_op_mode_dvm_start(struct iwl_trans *trans,
 		STATISTICS_NOTIFICATION,
 		REPLY_TX,
 	};
-	int i;
+	int i, err;
 
 	/************************
 	 * 1. Allocating HW data
@@ -1249,6 +1249,7 @@ static struct iwl_op_mode *iwl_op_mode_dvm_start(struct iwl_trans *trans,
 	hw = iwl_alloc_all();
 	if (!hw) {
 		pr_err("%s: Cannot allocate network device\n", trans->name);
+		err = -ENOMEM;
 		goto out;
 	}
 
@@ -1299,8 +1300,10 @@ static struct iwl_op_mode *iwl_op_mode_dvm_start(struct iwl_trans *trans,
 		break;
 	}
 
-	if (WARN_ON(!priv->lib))
+	if (WARN_ON(!priv->lib)) {
+		err = -ENODEV;
 		goto out_free_hw;
+	}
 
 	/*
 	 * Populate the state variables that the transport layer needs
@@ -1377,12 +1380,14 @@ static struct iwl_op_mode *iwl_op_mode_dvm_start(struct iwl_trans *trans,
 	IWL_INFO(priv, "Detected %s, REV=0x%X\n",
 		priv->trans->name, priv->trans->hw_rev);
 
-	if (iwl_trans_start_hw(priv->trans))
+	err = iwl_trans_start_hw(priv->trans);
+	if (err)
 		goto out_free_hw;
 
 	/* Read the EEPROM */
-	if (iwl_read_eeprom(priv->trans, &priv->eeprom_blob,
-			    &priv->eeprom_blob_size)) {
+	err = iwl_read_eeprom(priv->trans, &priv->eeprom_blob,
+			      &priv->eeprom_blob_size);
+	if (err) {
 		IWL_ERR(priv, "Unable to init EEPROM\n");
 		goto out_free_hw;
 	}
@@ -1393,13 +1398,17 @@ static struct iwl_op_mode *iwl_op_mode_dvm_start(struct iwl_trans *trans,
 	priv->nvm_data = iwl_parse_eeprom_data(priv->trans, priv->cfg,
 					       priv->eeprom_blob,
 					       priv->eeprom_blob_size);
-	if (!priv->nvm_data)
+	if (!priv->nvm_data) {
+		err = -ENOMEM;
 		goto out_free_eeprom_blob;
+	}
 
-	if (iwl_nvm_check_version(priv->nvm_data, priv->trans))
+	err = iwl_nvm_check_version(priv->nvm_data, priv->trans);
+	if (err)
 		goto out_free_eeprom;
 
-	if (iwl_eeprom_init_hw_params(priv))
+	err = iwl_eeprom_init_hw_params(priv);
+	if (err)
 		goto out_free_eeprom;
 
 	/* extract MAC Address */
@@ -1446,7 +1455,8 @@ static struct iwl_op_mode *iwl_op_mode_dvm_start(struct iwl_trans *trans,
 		atomic_set(&priv->queue_stop_count[i], 0);
 	}
 
-	if (iwl_init_drv(priv))
+	err = iwl_init_drv(priv);
+	if (err)
 		goto out_free_eeprom;
 
 	/* At this point both hw and priv are initialized. */
@@ -1480,7 +1490,8 @@ static struct iwl_op_mode *iwl_op_mode_dvm_start(struct iwl_trans *trans,
 	 *
 	 * 7. Setup and register with mac80211 and debugfs
 	 **************************************************/
-	if (iwlagn_mac_setup_register(priv, &fw->ucode_capa))
+	err = iwlagn_mac_setup_register(priv, &fw->ucode_capa);
+	if (err)
 		goto out_destroy_workqueue;
 
 	iwl_dbgfs_register(priv, dbgfs_dir);
@@ -1500,8 +1511,7 @@ out_free_eeprom:
 out_free_hw:
 	ieee80211_free_hw(priv->hw);
 out:
-	op_mode = NULL;
-	return op_mode;
+	return ERR_PTR(err);
 }
 
 static void iwl_op_mode_dvm_stop(struct iwl_op_mode *op_mode)

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

@@ -1429,7 +1429,7 @@ _iwl_op_mode_start(struct iwl_drv *drv, struct iwlwifi_opmode_table *op)
 		op_mode = ops->start(drv->trans, drv->trans->cfg,
 				     &drv->fw, dbgfs_dir);
 
-		if (op_mode)
+		if (!IS_ERR(op_mode))
 			return op_mode;
 
 		if (test_bit(STATUS_TRANS_DEAD, &drv->trans->status))

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

@@ -1285,6 +1285,7 @@ iwl_op_mode_mvm_start(struct iwl_trans *trans, const struct iwl_cfg *cfg,
 	size_t scan_size;
 	u32 min_backoff;
 	struct iwl_mvm_csme_conn_info *csme_conn_info __maybe_unused;
+	int err;
 
 	/*
 	 * We use IWL_STATION_COUNT_MAX to check the validity of the station
@@ -1302,7 +1303,7 @@ iwl_op_mode_mvm_start(struct iwl_trans *trans, const struct iwl_cfg *cfg,
 				iwl_mvm_has_mld_api(fw) ? &iwl_mvm_mld_hw_ops :
 				&iwl_mvm_hw_ops);
 	if (!hw)
-		return NULL;
+		return ERR_PTR(-ENOMEM);
 
 	if (trans->trans_cfg->device_family >= IWL_DEVICE_FAMILY_BZ)
 		max_agg = 512;
@@ -1347,8 +1348,10 @@ iwl_op_mode_mvm_start(struct iwl_trans *trans, const struct iwl_cfg *cfg,
 		trans->rx_mpdu_cmd_hdr_size =
 			sizeof(struct iwl_rx_mpdu_res_start);
 
-		if (WARN_ON(trans->num_rx_queues > 1))
+		if (WARN_ON(trans->num_rx_queues > 1)) {
+			err = -EINVAL;
 			goto out_free;
+		}
 	}
 
 	mvm->fw_restart = iwlwifi_mod_params.fw_restart ? -1 : 0;
@@ -1425,8 +1428,10 @@ iwl_op_mode_mvm_start(struct iwl_trans *trans, const struct iwl_cfg *cfg,
 		iwl_fw_lookup_notif_ver(mvm->fw, LOCATION_GROUP,
 					TOF_RANGE_RESPONSE_NOTIF, 5);
 	/* we only support up to version 9 */
-	if (WARN_ON_ONCE(mvm->cmd_ver.range_resp > 9))
+	if (WARN_ON_ONCE(mvm->cmd_ver.range_resp > 9)) {
+		err = -EINVAL;
 		goto out_free;
+	}
 
 	/*
 	 * Populate the state variables that the transport layer needs
@@ -1489,6 +1494,7 @@ iwl_op_mode_mvm_start(struct iwl_trans *trans, const struct iwl_cfg *cfg,
 	mvm->phy_db = iwl_phy_db_init(trans);
 	if (!mvm->phy_db) {
 		IWL_ERR(mvm, "Cannot init phy_db\n");
+		err = -ENOMEM;
 		goto out_free;
 	}
 
@@ -1501,8 +1507,10 @@ iwl_op_mode_mvm_start(struct iwl_trans *trans, const struct iwl_cfg *cfg,
 	scan_size = iwl_mvm_scan_size(mvm);
 
 	mvm->scan_cmd = kmalloc(scan_size, GFP_KERNEL);
-	if (!mvm->scan_cmd)
+	if (!mvm->scan_cmd) {
+		err = -ENOMEM;
 		goto out_free;
+	}
 	mvm->scan_cmd_size = scan_size;
 
 	/* invalidate ids to prevent accidental removal of sta_id 0 */
@@ -1531,7 +1539,8 @@ iwl_op_mode_mvm_start(struct iwl_trans *trans, const struct iwl_cfg *cfg,
 
 	iwl_mvm_mei_scan_filter_init(&mvm->mei_scan_filter);
 
-	if (iwl_mvm_start_get_nvm(mvm)) {
+	err = iwl_mvm_start_get_nvm(mvm);
+	if (err) {
 		/*
 		 * Getting NVM failed while CSME is the owner, but we are
 		 * registered to MEI, we'll get the NVM later when it'll be
@@ -1544,7 +1553,8 @@ iwl_op_mode_mvm_start(struct iwl_trans *trans, const struct iwl_cfg *cfg,
 	}
 
 
-	if (iwl_mvm_start_post_nvm(mvm))
+	err = iwl_mvm_start_post_nvm(mvm);
+	if (err)
 		goto out_thermal_exit;
 
 	return op_mode;
@@ -1564,7 +1574,7 @@ iwl_op_mode_mvm_start(struct iwl_trans *trans, const struct iwl_cfg *cfg,
 	iwl_trans_op_mode_leave(trans);
 
 	ieee80211_free_hw(mvm->hw);
-	return NULL;
+	return ERR_PTR(err);
 }
 
 void iwl_mvm_stop_device(struct iwl_mvm *mvm)