diff options
| author | Ying Xue <ying.xue@windriver.com> | 2014-01-15 10:23:40 +0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2014-01-14 18:50:46 -0800 |
| commit | d4c5fba2f6c272ed687fe6351e5b20bc60cf24f0 (patch) | |
| tree | 52c2a24ee3b90543b4a5e4d28b6fd513570f185e | |
| parent | d9ac62be5740272f495154469cc9f77feb8d541a (diff) | |
| download | linux-d4c5fba2f6c272ed687fe6351e5b20bc60cf24f0.tar.bz2 | |
decnet: use __dev_get_by_index instead of dev_get_by_index to find interface
The following call chain we can identify that dn_cache_getroute() is
protected under rtnl_lock. So if we use __dev_get_by_index() instead
of dev_get_by_index() to find interface handlers in it, this would help
us avoid to change interface reference counter.
rtnetlink_rcv()
rtnl_lock()
netlink_rcv_skb()
dn_cache_getroute()
rtnl_unlock()
Signed-off-by: Ying Xue <ying.xue@windriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | net/decnet/dn_route.c | 10 |
1 files changed, 2 insertions, 8 deletions
diff --git a/net/decnet/dn_route.c b/net/decnet/dn_route.c index ad2efa5b861b..ce0cbbfe0f43 100644 --- a/net/decnet/dn_route.c +++ b/net/decnet/dn_route.c @@ -1666,12 +1666,8 @@ static int dn_cache_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh) if (fld.flowidn_iif) { struct net_device *dev; - if ((dev = dev_get_by_index(&init_net, fld.flowidn_iif)) == NULL) { - kfree_skb(skb); - return -ENODEV; - } - if (!dev->dn_ptr) { - dev_put(dev); + dev = __dev_get_by_index(&init_net, fld.flowidn_iif); + if (!dev || !dev->dn_ptr) { kfree_skb(skb); return -ENODEV; } @@ -1693,8 +1689,6 @@ static int dn_cache_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh) err = dn_route_output_key((struct dst_entry **)&rt, &fld, 0); } - if (skb->dev) - dev_put(skb->dev); skb->dev = NULL; if (err) goto out_free; |