linux-kernel - [PATCH] driver: net: can: delete napi if register

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Date:   Wed, 13 Oct 2021 12:03:49 +0800
From:   Dongliang Mu <mudongliangabcd@...il.com>
To:     Appana Durga Kedareswara rao <appana.durga.rao@...inx.com>,
        Naga Sureshkumar Relli <naga.sureshkumar.relli@...inx.com>,
        Wolfgang Grandegger <wg@...ndegger.com>,
        Marc Kleine-Budde <mkl@...gutronix.de>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Michal Simek <michal.simek@...inx.com>
Cc:     Dongliang Mu <mudongliangabcd@...il.com>,
        linux-can@...r.kernel.org, netdev@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH] driver: net: can: delete napi if register_candev fails

If register_candev fails, xcan_probe does not clean the napi
created by netif_napi_add.

Fix this by adding error handling code to clean napi when
register_candev fails.

Signed-off-by: Dongliang Mu <mudongliangabcd@...il.com>
---
 drivers/net/can/xilinx_can.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/can/xilinx_can.c b/drivers/net/can/xilinx_can.c
index 3b883e607d8b..6ee0b5a8cdfc 100644
--- a/drivers/net/can/xilinx_can.c
+++ b/drivers/net/can/xilinx_can.c
@@ -1807,7 +1807,7 @@ static int xcan_probe(struct platform_device *pdev)
 	ret = register_candev(ndev);
 	if (ret) {
 		dev_err(&pdev->dev, "fail to register failed (err=%d)\n", ret);
-		goto err_disableclks;
+		goto err_del_napi;
 	}
 
 	devm_can_led_init(ndev);
@@ -1825,6 +1825,8 @@ static int xcan_probe(struct platform_device *pdev)
 
 	return 0;
 
+err_del_napi:
+	netif_napi_del(&priv->napi);
 err_disableclks:
 	pm_runtime_put(priv->dev);
 	pm_runtime_disable(&pdev->dev);
-- 
2.25.1