From: Steve Wise <sw...@opengridcomputing.com> Some HW platforms can reorder read operations, so we must rmb() after we see a valid gen bit in a CQE but before we read any other fields from the CQE.
Signed-off-by: Steve Wise <sw...@opengridcomputing.com> --- drivers/infiniband/hw/cxgb4/t4.h | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/infiniband/hw/cxgb4/t4.h b/drivers/infiniband/hw/cxgb4/t4.h index edab0e9..67cd09ee 100644 --- a/drivers/infiniband/hw/cxgb4/t4.h +++ b/drivers/infiniband/hw/cxgb4/t4.h @@ -622,6 +622,7 @@ static inline int t4_next_hw_cqe(struct t4_cq *cq, struct t4_cqe **cqe) printk(KERN_ERR MOD "cq overflow cqid %u\n", cq->cqid); BUG_ON(1); } else if (t4_valid_cqe(cq, &cq->queue[cq->cidx])) { + rmb(); *cqe = &cq->queue[cq->cidx]; ret = 0; } else -- 1.8.4 -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html