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hinic: fix out-of-order excution in arm cpu

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[ Upstream commit 33f15da216a1f4566b4ec880942556ace30615df ]

add read barrier in driver code to keep from reading other fileds
in dma memory which is writable for hw until we have verified the
memory is valid for driver

Signed-off-by: Luo bin <luobin9@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Luo bin 2020-03-20 23:13:18 +00:00 • committed by Greg Kroah-Hartman
commit 243ebc24e0
4 changed files with 9 additions and 0 deletions
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2
drivers/net/ethernet/huawei/hinic/hinic_hw_cmdq.c
View file

@ -623,6 +623,8 @@ static int cmdq_cmd_ceq_handler(struct hinic_cmdq *cmdq, u16 ci,
if (!CMDQ_WQE_COMPLETED(be32_to_cpu(ctrl->ctrl_info)))
return -EBUSY;
dma_rmb();
errcode = CMDQ_WQE_ERRCODE_GET(be32_to_cpu(status->status_info), VAL);
cmdq_sync_cmd_handler(cmdq, ci, errcode);

2
drivers/net/ethernet/huawei/hinic/hinic_hw_eqs.c
View file

@ -235,6 +235,8 @@ static void aeq_irq_handler(struct hinic_eq *eq)
if (HINIC_EQ_ELEM_DESC_GET(aeqe_desc, WRAPPED) == eq->wrapped)
break;
dma_rmb();
event = HINIC_EQ_ELEM_DESC_GET(aeqe_desc, TYPE);
if (event >= HINIC_MAX_AEQ_EVENTS) {
dev_err(&pdev->dev, "Unknown AEQ Event %d\n", event);

3
drivers/net/ethernet/huawei/hinic/hinic_rx.c
View file

@ -350,6 +350,9 @@ static int rxq_recv(struct hinic_rxq *rxq, int budget)
if (!rq_wqe)
break;
/* make sure we read rx_done before packet length */
dma_rmb();
cqe = rq->cqe[ci];
status = be32_to_cpu(cqe->status);
hinic_rq_get_sge(rxq->rq, rq_wqe, ci, &sge);

2
drivers/net/ethernet/huawei/hinic/hinic_tx.c
View file

@ -622,6 +622,8 @@ static int free_tx_poll(struct napi_struct *napi, int budget)
do {
hw_ci = HW_CONS_IDX(sq) & wq->mask;
dma_rmb();
/* Reading a WQEBB to get real WQE size and consumer index. */
sq_wqe = hinic_sq_read_wqebb(sq, &skb, &wqe_size, &sw_ci);
if ((!sq_wqe) ||