linux-kernel - [PATCH] can: ctucanfd: Fix an error handling path in ctucan_probe

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Message-Id: <4b78c848826fde1b8a3ccd53f32b80674812cb12.1684182962.git.christophe.jaillet@wanadoo.fr>
Date:   Mon, 15 May 2023 22:36:28 +0200
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     Pavel Pisa <pisa@....felk.cvut.cz>,
        Ondrej Ille <ondrej.ille@...il.com>,
        Wolfgang Grandegger <wg@...ndegger.com>,
        Marc Kleine-Budde <mkl@...gutronix.de>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Martin Jerabek <martin.jerabek01@...il.com>
Cc:     linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        linux-can@...r.kernel.org, netdev@...r.kernel.org
Subject: [PATCH] can: ctucanfd: Fix an error handling path in ctucan_probe_common()

If register_candev() fails, a previous netif_napi_add() needs to be undone.
Add the missing netif_napi_del() in the error handling path.

Fixes: 2dcb8e8782d8 ("can: ctucanfd: add support for CTU CAN FD open-source IP core - bus independent part.")
Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
 drivers/net/can/ctucanfd/ctucanfd_base.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/can/ctucanfd/ctucanfd_base.c b/drivers/net/can/ctucanfd/ctucanfd_base.c
index 64c349fd4600..59e1708e43d6 100644
--- a/drivers/net/can/ctucanfd/ctucanfd_base.c
+++ b/drivers/net/can/ctucanfd/ctucanfd_base.c
@@ -1429,7 +1429,7 @@ int ctucan_probe_common(struct device *dev, void __iomem *addr, int irq, unsigne
 	ret = register_candev(ndev);
 	if (ret) {
 		dev_err(dev, "fail to register failed (err=%d)\n", ret);
-		goto err_deviceoff;
+		goto err_del_napi;
 	}
 
 	pm_runtime_put(dev);
@@ -1439,6 +1439,8 @@ int ctucan_probe_common(struct device *dev, void __iomem *addr, int irq, unsigne
 
 	return 0;
 
+err_del_napi:
+	netif_napi_del(&priv->napi);
 err_deviceoff:
 	pm_runtime_put(priv->dev);
 err_pmdisable:
-- 
2.34.1