netdev - [PATCH v2] i40e: Fix error handling in i40e_init

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Message-ID: <20221116012725.13707-1-shangxiaojing@huawei.com>
Date:   Wed, 16 Nov 2022 09:27:25 +0800
From:   Shang XiaoJing <shangxiaojing@...wei.com>
To:     <jesse.brandeburg@...el.com>, <anthony.l.nguyen@...el.com>,
        <davem@...emloft.net>, <edumazet@...gle.com>, <kuba@...nel.org>,
        <pabeni@...hat.com>, <jeffrey.t.kirsher@...el.com>,
        <shannon.nelson@...el.com>, <intel-wired-lan@...ts.osuosl.org>,
        <netdev@...r.kernel.org>
CC:     <shangxiaojing@...wei.com>
Subject: [PATCH v2] i40e: Fix error handling in i40e_init_module()

i40e_init_module() won't free the debugfs directory created by
i40e_dbg_init() when pci_register_driver() failed. Add fail path to
call i40e_dbg_exit() to remove the debugfs entries to prevent the bug.

i40e: Intel(R) Ethernet Connection XL710 Network Driver
i40e: Copyright (c) 2013 - 2019 Intel Corporation.
debugfs: Directory 'i40e' with parent '/' already present!

Fixes: 41c445ff0f48 ("i40e: main driver core")
Signed-off-by: Shang XiaoJing <shangxiaojing@...wei.com>
---
changes in v2:
- destroy the workqueue in fail path too.
---
 drivers/net/ethernet/intel/i40e/i40e_main.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
index b5dcd15ced36..b3cb587a2032 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -16644,6 +16644,8 @@ static struct pci_driver i40e_driver = {
  **/
 static int __init i40e_init_module(void)
 {
+	int err;
+
 	pr_info("%s: %s\n", i40e_driver_name, i40e_driver_string);
 	pr_info("%s: %s\n", i40e_driver_name, i40e_copyright);
 
@@ -16661,7 +16663,14 @@ static int __init i40e_init_module(void)
 	}
 
 	i40e_dbg_init();
-	return pci_register_driver(&i40e_driver);
+	err = pci_register_driver(&i40e_driver);
+	if (err) {
+		destroy_workqueue(i40e_wq);
+		i40e_dbg_exit();
+		return err;
+	}
+
+	return 0;
 }
 module_init(i40e_init_module);
 
-- 
2.17.1