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GenWQE: Add wmb before DDCB is started

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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>
This commit is contained in:
Frank Haverkamp 2014-03-20 15:11:03 +01:00 • committed by Greg Kroah-Hartman
parent 5c5e058903
commit 68fe8acc20
1 changed files with 4 additions and 0 deletions
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4
drivers/misc/genwqe/card_ddcb.c
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@ -305,6 +305,8 @@ static int enqueue_ddcb(struct genwqe_dev *cd, struct ddcb_queue *queue,
break; break;
new = (old | DDCB_NEXT_BE32); new = (old | DDCB_NEXT_BE32);
wmb();
icrc_hsi_shi = cmpxchg(&prev_ddcb->icrc_hsi_shi_32, old, new); icrc_hsi_shi = cmpxchg(&prev_ddcb->icrc_hsi_shi_32, old, new);
if (icrc_hsi_shi == old) 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 */ /* Queue must be re-started by updating QUEUE_OFFSET */
ddcb_mark_tapped(pddcb); ddcb_mark_tapped(pddcb);
num = (u64)ddcb_no << 8; num = (u64)ddcb_no << 8;
wmb();
__genwqe_writeq(cd, queue->IO_QUEUE_OFFSET, num); /* start queue */ __genwqe_writeq(cd, queue->IO_QUEUE_OFFSET, num); /* start queue */
return RET_DDCB_TAPPED; return RET_DDCB_TAPPED;