vxlan: use __dev_get_by_index instead of dev_get_by_index to find interface
authorYing Xue <ying.xue@windriver.com>
Wed, 15 Jan 2014 02:23:41 +0000 (10:23 +0800)
committerDavid S. Miller <davem@davemloft.net>
Wed, 15 Jan 2014 02:50:46 +0000 (18:50 -0800)
commit737639493032afec87fc9e8809f80878f74bd465
treec45130aeceaee76e1a4ec7b20d092d1cb3afb1ce
parentd4c5fba2f6c272ed687fe6351e5b20bc60cf24f0
vxlan: use __dev_get_by_index instead of dev_get_by_index to find interface

The following call chains indicate that vxlan_fdb_parse() is
under rtnl_lock protection. So if we use __dev_get_by_index()
instead of dev_get_by_index() to find interface handler in it,
this would help us avoid to change interface reference counter.

rtnetlink_rcv()
  rtnl_lock()
  netlink_rcv_skb()
    rtnl_fdb_add()
      vxlan_fdb_add()
        vxlan_fdb_parse()
  rtnl_unlock()

rtnetlink_rcv()
  rtnl_lock()
  netlink_rcv_skb()
    rtnl_fdb_del()
      vxlan_fdb_del()
        vxlan_fdb_parse()
  rtnl_unlock()

Cc: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: Ying Xue <ying.xue@windriver.com>
Acked-by: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
drivers/net/vxlan.c