[PATCH net-next 08/12] net: hns3: handle empty unknown interrupt

[Huazhong Tan]

Since some MSI-X interrupt's status may be cleared by hardware,
so when the driver receives the interrupt, reading
HCLGE_VECTOR0_PF_OTHER_INT_STS_REG register will get an empty
unknown interrupt. For this case, the irq handler should enable
vector0 interrupt. This patch also use dev_info() instead of
dev_dbg() in the hclge_check_event_cause(), since this information
will be useful for normal usage.

Signed-off-by: Huazhong Tan <tanhuazh...@huawei.com>
Signed-off-by: Peng Li <lipeng...@huawei.com>
---
 drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c 
b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c
index 896605f..62c6263 100644
--- a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c
@@ -2783,8 +2783,9 @@ static u32 hclge_check_event_cause(struct hclge_dev 
*hdev, u32 *clearval)
 
        /* check for vector0 msix event source */
        if (msix_src_reg & HCLGE_VECTOR0_REG_MSIX_MASK) {
-               dev_dbg(&hdev->pdev->dev, "received event 0x%x\n",
-                       msix_src_reg);
+               dev_info(&hdev->pdev->dev, "received event 0x%x\n",
+                        msix_src_reg);
+               *clearval = msix_src_reg;
                return HCLGE_VECTOR0_EVENT_ERR;
        }
 
@@ -2796,8 +2797,11 @@ static u32 hclge_check_event_cause(struct hclge_dev 
*hdev, u32 *clearval)
        }
 
        /* print other vector0 event source */
-       dev_dbg(&hdev->pdev->dev, "cmdq_src_reg:0x%x, msix_src_reg:0x%x\n",
-               cmdq_src_reg, msix_src_reg);
+       dev_info(&hdev->pdev->dev,
+                "CMDQ INT status:0x%x, other INT status:0x%x\n",
+                cmdq_src_reg, msix_src_reg);
+       *clearval = msix_src_reg;
+
        return HCLGE_VECTOR0_EVENT_OTHER;
 }
 
@@ -2876,7 +2880,8 @@ static irqreturn_t hclge_misc_irq_handle(int irq, void 
*data)
        }
 
        /* clear the source of interrupt if it is not cause by reset */
-       if (event_cause == HCLGE_VECTOR0_EVENT_MBX) {
+       if (!clearval ||
+           event_cause == HCLGE_VECTOR0_EVENT_MBX) {
                hclge_clear_event_cause(hdev, event_cause, clearval);
                hclge_enable_vector(&hdev->misc_vector, true);
        }
-- 
2.7.4