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authorEberhard S. Amann <esa@linux.vnet.ibm.com>2014-09-10 18:37:52 +0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-09-24 10:15:47 +0400
commit08e4906cc29d092ae2da0ff089efe1488e584d3c (patch)
tree85c495b48f209fc636109c895fccefa398f8af7e /drivers/misc/genwqe
parentd9c11d45b33c9226abd50a50c87e19bfa7c7a2cb (diff)
downloadlinux-08e4906cc29d092ae2da0ff089efe1488e584d3c.tar.xz
GenWQE: Fix problem when reading HSI and Retc
This patch fixes a problem we found during debug on PPC64 when reading HSI status and Retc. Signed-off-by: Eberhard S. Amann <esa@linux.vnet.ibm.com> Signed-off-by: Frank Haverkamp <haver@linux.vnet.ibm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/misc/genwqe')
-rw-r--r--drivers/misc/genwqe/card_ddcb.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/misc/genwqe/card_ddcb.c b/drivers/misc/genwqe/card_ddcb.c
index f10575000180..51480e4f8054 100644
--- a/drivers/misc/genwqe/card_ddcb.c
+++ b/drivers/misc/genwqe/card_ddcb.c
@@ -390,8 +390,9 @@ static int genwqe_check_ddcb_queue(struct genwqe_dev *cd,
0x00000000)
goto go_home; /* not completed, continue waiting */
- /* Note: DDCB could be purged */
+ wmb(); /* Add sync to decouple prev. read operations */
+ /* Note: DDCB could be purged */
req = queue->ddcb_req[queue->ddcb_act];
if (req == NULL) {
/* this occurs if DDCB is purged, not an error */