linux-kernel - [PATCH] can: mcp251x: fix error handling code in mcp251x_can

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Message-Id: <20221024053711.696124-1-dzm91@hust.edu.cn>
Date:   Mon, 24 Oct 2022 13:37:07 +0800
From:   Dongliang Mu <dzm91@...t.edu.cn>
To:     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>,
        Vincent Mailhol <mailhol.vincent@...adoo.fr>,
        Oliver Hartkopp <socketcan@...tkopp.net>,
        Stefan Mätje <stefan.maetje@....eu>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Sebastian Würl <sebastian.wuerl@...ratech.com>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>
Cc:     Dongliang Mu <dzm91@...t.edu.cn>, linux-can@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] can: mcp251x: fix error handling code in mcp251x_can_probe

In mcp251x_can_probe, if mcp251x_gpio_setup fails, it forgets to
unregister the can device.

Fix this by unregistering can device in mcp251x_can_probe.

Signed-off-by: Dongliang Mu <dzm91@...t.edu.cn>
---
 drivers/net/can/spi/mcp251x.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/net/can/spi/mcp251x.c b/drivers/net/can/spi/mcp251x.c
index c320de474f40..b4b280c0699d 100644
--- a/drivers/net/can/spi/mcp251x.c
+++ b/drivers/net/can/spi/mcp251x.c
@@ -1415,11 +1415,14 @@ static int mcp251x_can_probe(struct spi_device *spi)
 
 	ret = mcp251x_gpio_setup(priv);
 	if (ret)
-		goto error_probe;
+		goto err_reg_candev;
 
 	netdev_info(net, "MCP%x successfully initialized.\n", priv->model);
 	return 0;
 
+err_reg_candev:
+	unregister_candev(net);
+
 error_probe:
 	destroy_workqueue(priv->wq);
 	priv->wq = NULL;
-- 
2.35.1