Needed to add wmb() before we send the DDCB for execution. Without the syncronizing it failed on System p.
Signed-off-by: Frank Haverkamp <[email protected]> --- drivers/misc/genwqe/card_ddcb.c | 4 ++++ 1 file changed, 4 insertions(+) --- a/drivers/misc/genwqe/card_ddcb.c +++ b/drivers/misc/genwqe/card_ddcb.c @@ -305,6 +305,8 @@ static int enqueue_ddcb(struct genwqe_de 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_de /* 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; -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
