tree 13d8f9558b39963356082460de3ee6855454d972
parent ebb2c96bb9214ba38c7fe35d5d725f6e7cb3bbc8
author Frank Haverkamp <haver@linux.vnet.ibm.com> 1395324665 +0100
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1397675559 -0700

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>