netdev - [PATCH] net: ena: Fix error handling in ena

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Date:   Mon, 14 Nov 2022 02:56:59 +0000
From:   Yuan Can <yuancan@...wei.com>
To:     <shayagr@...zon.com>, <akiyano@...zon.com>, <darinzon@...zon.com>,
        <ndagan@...zon.com>, <saeedb@...zon.com>, <davem@...emloft.net>,
        <edumazet@...gle.com>, <kuba@...nel.org>, <pabeni@...hat.com>,
        <nkoler@...zon.com>, <wsa+renesas@...g-engineering.com>,
        <netanel@...apurnalabs.com>, <netdev@...r.kernel.org>
CC:     <yuancan@...wei.com>
Subject: [PATCH] net: ena: Fix error handling in ena_init()

The ena_init() won't destroy workqueue created by
create_singlethread_workqueue() when pci_register_driver() failed.
Call destroy_workqueue() when pci_register_driver() failed to prevent the
resource leak.

Fixes: 1738cd3ed342 ("net: ena: Add a driver for Amazon Elastic Network Adapters (ENA)")
Signed-off-by: Yuan Can <yuancan@...wei.com>
---
 drivers/net/ethernet/amazon/ena/ena_netdev.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/amazon/ena/ena_netdev.c b/drivers/net/ethernet/amazon/ena/ena_netdev.c
index d350eeec8bad..5a454b58498f 100644
--- a/drivers/net/ethernet/amazon/ena/ena_netdev.c
+++ b/drivers/net/ethernet/amazon/ena/ena_netdev.c
@@ -4543,13 +4543,19 @@ static struct pci_driver ena_pci_driver = {
 
 static int __init ena_init(void)
 {
+	int ret;
+
 	ena_wq = create_singlethread_workqueue(DRV_MODULE_NAME);
 	if (!ena_wq) {
 		pr_err("Failed to create workqueue\n");
 		return -ENOMEM;
 	}
 
-	return pci_register_driver(&ena_pci_driver);
+	ret = pci_register_driver(&ena_pci_driver);
+	if (ret)
+		destroy_workqueue(ena_wq);
+
+	return ret;
 }
 
 static void __exit ena_cleanup(void)
-- 
2.17.1