batman-adv: use __dev_get_by_index instead of dev_get_by_index to find interface
authorYing Xue <ying.xue@windriver.com>
Wed, 15 Jan 2014 02:23:42 +0000 (10:23 +0800)
committerDavid S. Miller <davem@davemloft.net>
Wed, 15 Jan 2014 02:50:47 +0000 (18:50 -0800)
commit16b77695ed8fa158be864ee448a9ef4c78457c14
tree190bea238dc941acb25f8178838dba9cf6402b55
parent737639493032afec87fc9e8809f80878f74bd465
batman-adv: use __dev_get_by_index instead of dev_get_by_index to find interface

The following call chains indicate that batadv_is_on_batman_iface()
is always under rtnl_lock protection as call_netdevice_notifier()
is protected by rtnl_lock. So if __dev_get_by_index() rather than
dev_get_by_index() is used to find interface handler in it, this
would help us avoid to change interface reference counter.

call_netdevice_notifier()
  batadv_hard_if_event()
    batadv_hardif_add_interface()
      batadv_is_valid_iface()
        batadv_is_on_batman_iface()

Cc: Antonio Quartulli <antonio@meshcoding.com>
Signed-off-by: Ying Xue <ying.xue@windriver.com>
Acked-by: Antonio Quartulli <antonio@meshcoding.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
net/batman-adv/hard-interface.c