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authorFrank Haverkamp <haver@linux.vnet.ibm.com>2014-03-20 18:11:03 +0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-04-16 23:12:38 +0400
commit68fe8acc204c7fbefd4c01b8929fedb244ec283d (patch)
tree51f8a953eb1505cbf9a356655ebfc770393bdc53 /drivers/misc
parent5c5e0589038537848849fc827f5234a31a10f899 (diff)
downloadlinux-68fe8acc204c7fbefd4c01b8929fedb244ec283d.tar.xz
GenWQE: Add wmb before DDCB is started
Needed to add wmb() before we send the DDCB for execution. Without the syncronizing it failed on System p. Signed-off-by: Frank Haverkamp <haver@linux.vnet.ibm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/misc')
-rw-r--r--drivers/misc/genwqe/card_ddcb.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/misc/genwqe/card_ddcb.c b/drivers/misc/genwqe/card_ddcb.c
index 6f1acc0ccf88..29a1a28be02a 100644
--- a/drivers/misc/genwqe/card_ddcb.c
+++ b/drivers/misc/genwqe/card_ddcb.c
@@ -305,6 +305,8 @@ static int enqueue_ddcb(struct genwqe_dev *cd, struct ddcb_queue *queue,
break;
new = (old | DDCB_NEXT_BE32);
+
+ wmb();
icrc_hsi_shi = cmpxchg(&prev_ddcb->icrc_hsi_shi_32, old, new);
if (icrc_hsi_shi == old)
@@ -314,6 +316,8 @@ static int enqueue_ddcb(struct genwqe_dev *cd, struct ddcb_queue *queue,
/* Queue must be re-started by updating QUEUE_OFFSET */
ddcb_mark_tapped(pddcb);
num = (u64)ddcb_no << 8;
+
+ wmb();
__genwqe_writeq(cd, queue->IO_QUEUE_OFFSET, num); /* start queue */
return RET_DDCB_TAPPED;