s390: add barriers to qeth driver

Add barrier to loop where atomic variable is evaluated.

Signed-off-by: Frank Blaschka <frank.blaschka@de.ibm.com>
Signed-off-by: Ursula Braun <braunu@de.ibm.com>
Signed-off-by: Frank Pavlic <fpavlic@de.ibm.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

drivers/s390/net/qeth_main.c

diff --git a/drivers/s390/net/qeth_main.c b/drivers/s390/net/qeth_main.c
index 8dca935..57f6943 100644
--- a/drivers/s390/net/qeth_main.c
+++ b/drivers/s390/net/qeth_main.c
@@ -1935,6 +1935,7 @@
 			atomic_inc(&reply->received);
 			wake_up(&reply->wait_q);
 		}
+		cpu_relax();
 	};
 	rc = reply->rc;
 	qeth_put_reply(reply);