[PATCH] net/sched: cbs: Fix error path of cbs_module_init

[YueHaibing]

If register_qdisc fails, we should unregister
netdevice notifier.

Reported-by: Hulk Robot <hul...@huawei.com>
Fixes: e0a7683d30e9 ("net/sched: cbs: fix port_rate miscalculation")
Signed-off-by: YueHaibing <yuehaib...@huawei.com>
---
 net/sched/sch_cbs.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/net/sched/sch_cbs.c b/net/sched/sch_cbs.c
index e16a3d3..4e1a878 100644
--- a/net/sched/sch_cbs.c
+++ b/net/sched/sch_cbs.c
@@ -549,12 +549,17 @@ static struct notifier_block cbs_device_notifier = {
 
 static int __init cbs_module_init(void)
 {
-       int err = register_netdevice_notifier(&cbs_device_notifier);
+       int err;
 
+       err = register_netdevice_notifier(&cbs_device_notifier);
        if (err)
                return err;
 
-       return register_qdisc(&cbs_qdisc_ops);
+       err = register_qdisc(&cbs_qdisc_ops);
+       if (err)
+               unregister_netdevice_notifier(&cbs_device_notifier);
+
+       return err;
 }
 
 static void __exit cbs_module_exit(void)
-- 
2.7.4