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Commit 614c3c85 authored by Roland Dreier's avatar Roland Dreier
Browse files

IB/mlx4: Fix handling of wq->tail for send completions 



Cast the increment added to wq->tail when send completions are
processed to u16 to avoid using wrong values caused by standard
integer promotions.

The same bug was fixed in libmlx4 by Eli Cohen <eli@mellanox.co.il>.

Signed-off-by: default avatarRoland Dreier <rolandd@cisco.com>
parent 99f9f3d4

drivers/infiniband/hw/mlx4/cq.c

+1 −1
Original line number Diff line number Diff line
@@ -354,7 +354,7 @@ static int mlx4_ib_poll_one(struct mlx4_ib_cq *cq, 
	if (is_send) {

		wq = &(*cur_qp)->sq;

		wqe_ctr = be16_to_cpu(cqe->wqe_index);

		wq->tail += wqe_ctr - (u16) wq->tail;

		wq->tail += (u16) (wqe_ctr - (u16) wq->tail);

		wc->wr_id = wq->wrid[wq->tail & (wq->max - 1)];

		++wq->tail;

	} else if ((*cur_qp)->ibqp.srq) {