netdev - Re: [PATCH] VSOCK: set POLLOUT | POLLWRNORM for TCP

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Date:   Fri, 26 Jan 2018 11:17:01 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     stefanha@...hat.com
Cc:     netdev@...r.kernel.org, decui@...rosoft.com, jhansen@...are.com
Subject: Re: [PATCH] VSOCK: set POLLOUT | POLLWRNORM for TCP_CLOSING

From: Stefan Hajnoczi <stefanha@...hat.com>
Date: Fri, 26 Jan 2018 11:48:25 +0000

> select(2) with wfds but no rfds must return when the socket is shut down
> by the peer.  This way userspace notices socket activity and gets -EPIPE
> from the next write(2).
> 
> Currently select(2) does not return for virtio-vsock when a SEND+RCV
> shutdown packet is received.  This is because vsock_poll() only sets
> POLLOUT | POLLWRNORM for TCP_CLOSE, not the TCP_CLOSING state that the
> socket is in when the shutdown is received.
> 
> Signed-off-by: Stefan Hajnoczi <stefanha@...hat.com>

Applied and queued up for -stable, thank you.