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| author | Ying Xue <ying.xue@windriver.com> | 2014-01-15 10:23:42 +0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2014-01-14 18:50:47 -0800 |
| commit | 16b77695ed8fa158be864ee448a9ef4c78457c14 (patch) | |
| tree | 190bea238dc941acb25f8178838dba9cf6402b55 /net/batman-adv/hard-interface.c | |
| parent | 737639493032afec87fc9e8809f80878f74bd465 (diff) | |
| download | lwn-16b77695ed8fa158be864ee448a9ef4c78457c14.tar.gz lwn-16b77695ed8fa158be864ee448a9ef4c78457c14.zip | |
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>
Diffstat (limited to 'net/batman-adv/hard-interface.c')
| -rw-r--r-- | net/batman-adv/hard-interface.c | 4 |
1 files changed, 1 insertions, 3 deletions
diff --git a/net/batman-adv/hard-interface.c b/net/batman-adv/hard-interface.c index 1b12573bcf83..3d417d3641c6 100644 --- a/net/batman-adv/hard-interface.c +++ b/net/batman-adv/hard-interface.c @@ -87,15 +87,13 @@ static bool batadv_is_on_batman_iface(const struct net_device *net_dev) return false; /* recurse over the parent device */ - parent_dev = dev_get_by_index(&init_net, net_dev->iflink); + parent_dev = __dev_get_by_index(&init_net, net_dev->iflink); /* if we got a NULL parent_dev there is something broken.. */ if (WARN(!parent_dev, "Cannot find parent device")) return false; ret = batadv_is_on_batman_iface(parent_dev); - if (parent_dev) - dev_put(parent_dev); return ret; } |