ipvs: call rtnl_lock early
When the sync damon is started we need to hold rtnl lock while calling ip_mc_join_group. Currently, we have a wrong locking order because the correct one is rtnl_lock->__ip_vs_mutex. It is implied from the usage of __ip_vs_mutex in ip_vs_dst_event() which is called under rtnl lock during NETDEV_* notifications. Fix the problem by calling rtnl_lock early only for the start_sync_thread call. As a bonus this fixes the usage __dev_get_by_name which was not called under rtnl lock. This patch actually extends and depends on commit 54ff9ef3 ("ipv4, ipv6: kill ip_mc_{join, leave}_group and ipv6_sock_mc_{join, drop}"). Signed-off-by: NJulian Anastasov <ja@ssi.bg> Signed-off-by: NSimon Horman <horms@verge.net.au>
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