From 4a62e252e888f67cb87caf36f48338889b0b8a43 Mon Sep 17 00:00:00 2001 From: Huazhong Tan Date: Wed, 1 Aug 2018 18:27:03 +0800 Subject: [PATCH] net: hns3: fix return value error while hclge_cmd_csq_clean failed While cleaning the command queue, the value of the HEAD register is not in the range of next_to_clean and next_to_use, meaning that this value is invalid. This also means that there is a hardware error and the hardware will trigger a reset soon. At this time we should return an error code instead of 0, and HCLGE_STATE_CMD_DISABLE needs to be set to prevent sending command again. Fixes: 3ff504908f95 ("net: hns3: fix a dead loop in hclge_cmd_csq_clean") Signed-off-by: Huazhong Tan Signed-off-by: Salil Mehta Signed-off-by: David S. Miller --- .../net/ethernet/hisilicon/hns3/hns3pf/hclge_cmd.c | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-) diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_cmd.c b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_cmd.c index 165c3d5e1c4c..ac13cb2b168e 100644 --- a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_cmd.c +++ b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_cmd.c @@ -147,7 +147,12 @@ static int hclge_cmd_csq_clean(struct hclge_hw *hw) if (!is_valid_csq_clean_head(csq, head)) { dev_warn(&hdev->pdev->dev, "wrong cmd head (%d, %d-%d)\n", head, csq->next_to_use, csq->next_to_clean); - return 0; + dev_warn(&hdev->pdev->dev, + "Disabling any further commands to IMP firmware\n"); + set_bit(HCLGE_STATE_CMD_DISABLE, &hdev->state); + dev_warn(&hdev->pdev->dev, + "IMP firmware watchdog reset soon expected!\n"); + return -EIO; } clean = (head - csq->next_to_clean + csq->desc_num) % csq->desc_num; @@ -267,10 +272,11 @@ int hclge_cmd_send(struct hclge_hw *hw, struct hclge_desc *desc, int num) /* Clean the command send queue */ handle = hclge_cmd_csq_clean(hw); - if (handle != num) { + if (handle < 0) + retval = handle; + else if (handle != num) dev_warn(&hdev->pdev->dev, "cleaned %d, need to clean %d\n", handle, num); - } spin_unlock_bh(&hw->cmq.csq.lock); -- 2.30.2