linux-kernel - [PATCH v2] iwlwifi: Add missing check for alloc_ordered

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Message-Id: <20230110014848.28226-1-jiasheng@iscas.ac.cn>
Date:   Tue, 10 Jan 2023 09:48:48 +0800
From:   Jiasheng Jiang <jiasheng@...as.ac.cn>
To:     kvalo@...nel.org
Cc:     gregory.greenman@...el.com, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
        luciano.coelho@...el.com, johannes.berg@...el.com,
        shaul.triebitz@...el.com, linux-wireless@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jiasheng Jiang <jiasheng@...as.ac.cn>
Subject: [PATCH v2] iwlwifi: Add missing check for alloc_ordered_workqueue

Add check for the return value of alloc_ordered_workqueue since it may
return NULL pointer.

Fixes: b481de9ca074 ("[IWLWIFI]: add iwlwifi wireless drivers")
Signed-off-by: Jiasheng Jiang <jiasheng@...as.ac.cn>
---
Changelog:

v1 -> v2:

1. CC "linux-wireless@...r.kernel.org".
---
 drivers/net/wireless/intel/iwlwifi/dvm/main.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/intel/iwlwifi/dvm/main.c b/drivers/net/wireless/intel/iwlwifi/dvm/main.c
index a873be109f43..b490a88b97ca 100644
--- a/drivers/net/wireless/intel/iwlwifi/dvm/main.c
+++ b/drivers/net/wireless/intel/iwlwifi/dvm/main.c
@@ -1048,9 +1048,11 @@ static void iwl_bg_restart(struct work_struct *data)
  *
  *****************************************************************************/
 
-static void iwl_setup_deferred_work(struct iwl_priv *priv)
+static int iwl_setup_deferred_work(struct iwl_priv *priv)
 {
 	priv->workqueue = alloc_ordered_workqueue(DRV_NAME, 0);
+	if (!priv->workqueue)
+		return -ENOMEM;
 
 	INIT_WORK(&priv->restart, iwl_bg_restart);
 	INIT_WORK(&priv->beacon_update, iwl_bg_beacon_update);
@@ -1067,6 +1069,8 @@ static void iwl_setup_deferred_work(struct iwl_priv *priv)
 	timer_setup(&priv->statistics_periodic, iwl_bg_statistics_periodic, 0);
 
 	timer_setup(&priv->ucode_trace, iwl_bg_ucode_trace, 0);
+
+	return 0;
 }
 
 void iwl_cancel_deferred_work(struct iwl_priv *priv)
@@ -1456,7 +1460,9 @@ static struct iwl_op_mode *iwl_op_mode_dvm_start(struct iwl_trans *trans,
 	/********************
 	 * 6. Setup services
 	 ********************/
-	iwl_setup_deferred_work(priv);
+	if (iwl_setup_deferred_work(priv))
+		goto out_uninit_drv;
+
 	iwl_setup_rx_handlers(priv);
 
 	iwl_power_initialize(priv);
@@ -1494,6 +1500,7 @@ static struct iwl_op_mode *iwl_op_mode_dvm_start(struct iwl_trans *trans,
 	iwl_cancel_deferred_work(priv);
 	destroy_workqueue(priv->workqueue);
 	priv->workqueue = NULL;
+out_uninit_drv:
 	iwl_uninit_drv(priv);
 out_free_eeprom_blob:
 	kfree(priv->eeprom_blob);
-- 
2.25.1