From 3c7151275c0c9a80c3375f9874b1c7129a105eea Mon Sep 17 00:00:00 2001
From: "jbaron@akamai.com" <jbaron@akamai.com>
Date: Mon, 20 Apr 2015 20:05:07 +0000
Subject: [PATCH] tcp: add memory barriers to write space paths

Ensure that we either see that the buffer has write space
in tcp_poll() or that we perform a wakeup from the input
side. Did not run into any actual problem here, but thought
that we should make things explicit.

Signed-off-by: Jason Baron <jbaron@akamai.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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