From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Miller <davem@davemloft.net>
Subject: Re: [PATCH net-next 1/2] net: SOCKWQ_ASYNC_NOSPACE optimizations
Date: Mon, 02 May 2016 16:31:40 -0400 (EDT)
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From: Eric Dumazet <eric.dumazet@gmail.com>
Date: Mon, 02 May 2016 13:23:27 -0700

> It looks like net/sunrpc/xprtsock.c should set SOCK_FASYNC
> even if it is not actually using fasync_list
> 
> Could you try this quick hack to check if this is the right way ?

Indeed, it tests the ASYNC bit without enabling FASYNC.

There are three other places that do this: macvtap, tun, dlm lowcomms.