From: Ziyang Xuan <william.xuanziyang@xxxxxxxxxx> Now, register_netdevice_notifier() and register_pernet_subsys() are both after can_proto_register(). It can create CAN_BCM socket and process socket once can_proto_register() successfully, so it is possible missing notifier event or proc node creation because notifier or bcm proc directory is not registered or created yet. Although this is a low probability scenario, it is not impossible. Move register_pernet_subsys() and register_netdevice_notifier() to the front of can_proto_register(). In addition, register_pernet_subsys() and register_netdevice_notifier() may fail, check their results are necessary. Signed-off-by: Ziyang Xuan <william.xuanziyang@xxxxxxxxxx> Link: https://lore.kernel.org/all/823cff0ebec33fa9389eeaf8b8ded3217c32cb38.1663206163.git.william.xuanziyang@xxxxxxxxxx Acked-by: Oliver Hartkopp <socketcan@xxxxxxxxxxxx> Signed-off-by: Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx> --- net/can/bcm.c | 18 +++++++++++++++--- 1 file changed, 15 insertions(+), 3 deletions(-) diff --git a/net/can/bcm.c b/net/can/bcm.c index e5d179ba6f7d..0a2adb844280 100644 --- a/net/can/bcm.c +++ b/net/can/bcm.c @@ -1749,15 +1749,27 @@ static int __init bcm_module_init(void) pr_info("can: broadcast manager protocol\n"); + err = register_pernet_subsys(&canbcm_pernet_ops); + if (err) + return err; + + err = register_netdevice_notifier(&canbcm_notifier); + if (err) + goto register_notifier_failed; + err = can_proto_register(&bcm_can_proto); if (err < 0) { printk(KERN_ERR "can: registration of bcm protocol failed\n"); - return err; + goto register_proto_failed; } - register_pernet_subsys(&canbcm_pernet_ops); - register_netdevice_notifier(&canbcm_notifier); return 0; + +register_proto_failed: + unregister_netdevice_notifier(&canbcm_notifier); +register_notifier_failed: + unregister_pernet_subsys(&canbcm_pernet_ops); + return err; } static void __exit bcm_module_exit(void) base-commit: d05d9eb79d0cd0f7a978621b4a56a1f2db444f86 -- 2.35.1
