From 718f762efc454796d02f172a929d051f2d6ec01a Mon Sep 17 00:00:00 2001
From: Frank Haverkamp <haver@linux.vnet.ibm.com>
Date: Thu, 20 Mar 2014 15:11:05 +0100
Subject: [PATCH] GenWQE: Fix multithreading problems

When being used in a multithreaded application there were problems
with memory pages/cachelines accessed by multiple threads/cpus at the
same time, while doing DMA transfers to/from those. To avoid such
situations this fix is creating a copy of the first and the last page
if it is not fully used. The data is copied from user-space into those
pages and results are copied back when the DDCB-request is
successfully finished.

Signed-off-by: Frank Haverkamp <haver@linux.vnet.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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