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net-sysfs: call dev_hold if kobject_init_and_add success

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In netdev_queue_add_kobject and rx_queue_add_kobject,
if sysfs_create_group failed, kobject_put will call
netdev_queue_release to decrease dev refcont, however
dev_hold has not be called. So we will see this while
unregistering dev:

unregister_netdevice: waiting for bcsh0 to become free. Usage count = -1

Reported-by: Hulk Robot <hulkci@huawei.com>
Fixes: d0d6683716 ("net: don't decrement kobj reference count on init failure")
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
YueHaibing 2019-03-19 10:16:53 +08:00 committed by David S. Miller
parent 223a960c01
commit a3e23f719f
1 changed files with 4 additions and 2 deletions
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6
net/core/net-sysfs.c
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@ -928,6 +928,8 @@ static int rx_queue_add_kobject(struct net_device *dev, int index)
if (error)
return error;
dev_hold(queue->dev);
if (dev->sysfs_rx_queue_group) {
error = sysfs_create_group(kobj, dev->sysfs_rx_queue_group);
if (error) {
@ -937,7 +939,6 @@ static int rx_queue_add_kobject(struct net_device *dev, int index)
}
kobject_uevent(kobj, KOBJ_ADD);
dev_hold(queue->dev);
return error;
}
@ -1464,6 +1465,8 @@ static int netdev_queue_add_kobject(struct net_device *dev, int index)
if (error)
return error;
dev_hold(queue->dev);
#ifdef CONFIG_BQL
error = sysfs_create_group(kobj, &dql_group);
if (error) {
@ -1473,7 +1476,6 @@ static int netdev_queue_add_kobject(struct net_device *dev, int index)
#endif
kobject_uevent(kobj, KOBJ_ADD);
dev_hold(queue->dev);
return 0;
}