From 683bce8d2ecebf16147103a49ad891191d390bd5 Mon Sep 17 00:00:00 2001
From: Qiang Huang <h.huangqiang@huawei.com>
Date: Fri, 18 Apr 2014 17:29:24 +0800
Subject: [PATCH] drivers: hv: additional switch to use mb() instead of
 smp_mb()

commit e4af376d04b0(drivers: hv: switch to use mb() instead of smp_mb()),
the adjustment mistakenly dropped the change in hv_ringbuffer_read,
so add it.

Signed-off-by: Qiang Huang <h.huangqiang@huawei.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
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