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From: David Miller <davem@davemloft.net>
Subject: Re: [PATCH net] vxlan: add necessary locking on device removal
Date: Tue, 16 Jul 2013 23:06:00 -0700 (PDT)
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From: Pravin Shelar <pshelar@nicira.com>
Date: Tue, 16 Jul 2013 13:29:08 -0700

> commit 1c51a9159ddefa51 (vxlan: fix race caused by dropping
> rtnl_unlock) moved sock-create to sock_work workq. Thats why I thought
> sock_work takes RTNL. but if it is not taking RTNL in any case, they
> why vxlan sock create is deferred to sock_work?

That commit is handling the fact that the RTNL mutex is NOT held
during the create operation in question.

It defers to a workqueue so that the new ->sock_lock can be taken
in the appropriate context.