scsi: hisi_sas: Warn in v3 hw channel interrupt handler when status reg cleared

If a channel interrupt occurs without any status bit set, the handler will
return directly. However, if such redundant interrupts are received, it's
better to check what happen, so add logs for this.

Link: https://lore.kernel.org/r/1617709711-195853-6-git-send-email-john.garry@huawei.comSigned-off-by: Luo Jiaxing <luojiaxing@huawei.com>
Signed-off-by: Yihang Li <liyihang6@hisilicon.com>
Signed-off-by: John Garry <john.garry@huawei.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/hisi_sas/hisi_sas_v3_hw.c

@@ -1718,8 +1718,11 @@ static void handle_chl_int1_v3_hw(struct hisi_hba *hisi_hba, int phy_no)
 	int i;
 
 	irq_value &= ~irq_msk;
-	if (!irq_value)
+	if (!irq_value) {
+		dev_warn(dev, "phy%d channel int 1 received with status bits cleared\n",
+			 phy_no);
 		return;
+	}
 
 	for (i = 0; i < ARRAY_SIZE(port_axi_error); i++) {
 		const struct hisi_sas_hw_error *error = &port_axi_error[i];
@@ -1780,8 +1783,11 @@ static void handle_chl_int2_v3_hw(struct hisi_hba *hisi_hba, int phy_no)
 			BIT(CHL_INT2_RX_INVLD_DW_OFF);
 
 	irq_value &= ~irq_msk;
-	if (!irq_value)
+	if (!irq_value) {
+		dev_warn(dev, "phy%d channel int 2 received with status bits cleared\n",
+			 phy_no);
 		return;
+	}
 
 	if (irq_value & BIT(CHL_INT2_SL_IDAF_TOUT_CONF_OFF)) {
 		dev_warn(dev, "phy%d identify timeout\n", phy_no);