Commit 68fe8acc authored by Frank Haverkamp's avatar Frank Haverkamp Committed by Greg Kroah-Hartman
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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: default avatarFrank Haverkamp <haver@linux.vnet.ibm.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 5c5e0589

drivers/misc/genwqe/card_ddcb.c

+4 −0
Original line number Diff line number Diff line
@@ -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;