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>
diff --git a/drivers/misc/genwqe/card_ddcb.c b/drivers/misc/genwqe/card_ddcb.c
index f105750..51480e4 100644
--- a/drivers/misc/genwqe/card_ddcb.c
+++ b/drivers/misc/genwqe/card_ddcb.c
@@ -390,8 +390,9 @@
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 */