net: hns3: hanlde empty unknown interrupt

driver inclusion
category: bugfix
bugzilla: NA
CVE: NA

Since some msix 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.
Signed-off-by: NHuazhong Tan <tanhuazhong@huawei.com>
Reviewed-by: Nlipeng <lipeng321@huawei.com>
Reviewed-by: NYang Yingliang <yangyingliang@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>

drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c

@@ -2737,6 +2737,7 @@ static u32 hclge_check_event_cause(struct hclge_dev *hdev, u32 *clearval)
 	if (msix_src_reg & HCLGE_VECTOR0_REG_MSIX_MASK) {
 		dev_info(&hdev->pdev->dev, "received event 0x%x\n",
 			 msix_src_reg);
+		*clearval = msix_src_reg;
 		return HCLGE_VECTOR0_EVENT_ERR;
 	}
 
@@ -2750,6 +2751,8 @@ static u32 hclge_check_event_cause(struct hclge_dev *hdev, u32 *clearval)
 	/* print other vector0 event source */
 	dev_info(&hdev->pdev->dev, "cmdq_src_reg:0x%x, msix_src_reg:0x%x\n",
 		 cmdq_src_reg, msix_src_reg);
+	*clearval = msix_src_reg;
+
 	return HCLGE_VECTOR0_EVENT_OTHER;
 }
 
@@ -2830,7 +2833,8 @@ static irqreturn_t hclge_misc_irq_handle(int irq, void *data)
 	hclge_clear_event_cause(hdev, event_cause, clearval);
 
 	/* 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_enable_vector(&hdev->misc_vector, true);
 	}