[PATCH 5.15 040/120] can: etas_es58x: es58x_init_netdev(): free netdev when register_candev()

Greg Kroah-Hartman
2022-12-05T19:37:56Z

From: Zhang Changzhong <zhangchangzhong@huawei.com>

[ Upstream commit 709cb2f9ed2006eb1dc4b36b99d601cd24889ec4 ]

In case of register_candev() fails, clear
es58x_dev->netdev[channel_idx] and add free_candev(). Otherwise
es58x_free_netdevs() will unregister the netdev that has never been
registered.

Fixes: 8537257874e9 ("can: etas_es58x: add core support for ETAS ES58X CAN USB interfaces")
Signed-off-by: Zhang Changzhong <zhangchangzhong@huawei.com>
Acked-by: Arunachalam Santhanam <Arunachalam.Santhanam@in.bosch.com>
Acked-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
Link: https://lore.kernel.org/all/1668413685-23354-1-git-send-email-zhangchangzhong@huawei.com
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/can/usb/etas_es58x/es58x_core.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/net/can/usb/etas_es58x/es58x_core.c b/drivers/net/can/usb/etas_es58x/es58x_core.c
index cd4e7f356e48..0e6faf962ebb 100644
--- a/drivers/net/can/usb/etas_es58x/es58x_core.c
+++ b/drivers/net/can/usb/etas_es58x/es58x_core.c
@@ -2098,8 +2098,11 @@ static int es58x_init_netdev(struct es58x_device *es58x_dev, int channel_idx)
netdev->flags |= IFF_ECHO; /* We support local echo */

ret = register_candev(netdev);
- if (ret)
+ if (ret) {
+ es58x_dev->netdev[channel_idx] = NULL;
+ free_candev(netdev);
return ret;
+ }

netdev_queue_set_dql_min_limit(netdev_get_tx_queue(netdev, 0),
es58x_dev->param->dql_min_limit);
--
2.35.1