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rtnetlink: rtnl_have_link_slave_info doesn't need rtnl 

it can be switched to rcu.

Reviewed-by: David Ahern <dsahern@gmail.com>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Florian Westphal 2017-09-26 13:58:43 +02:00 committed by David S. Miller
parent b1e66b9a67
commit 4c82a95e52
1 changed files with 7 additions and 3 deletions
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10
net/core/rtnetlink.c
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@ -522,11 +522,15 @@ static size_t rtnl_link_get_af_size(const struct net_device *dev,
static bool rtnl_have_link_slave_info(const struct net_device *dev)
{
struct net_device *master_dev;
bool ret = false;
master_dev = netdev_master_upper_dev_get((struct net_device *) dev);
rcu_read_lock();
master_dev = netdev_master_upper_dev_get_rcu((struct net_device *)dev);
if (master_dev && master_dev->rtnl_link_ops)
return true;
return false;
ret = true;
rcu_read_unlock();
return ret;
}
static int rtnl_link_slave_info_fill(struct sk_buff *skb,