scsi: hisi_sas: avoid potential v2 hw interrupt issue

When some interrupts happen together, we need to process every interrupt
one-by-one, and should not return immediately when one interrupt process
is finished being processed.

Signed-off-by: Xiang Chen <chenxiang66@hisilicon.com>
Signed-off-by: John Garry <john.garry@huawei.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

diff --git a/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c b/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c
index a6be33c..8c504b4 100644 (file)
--- a/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c
+++ b/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c
@@ -2606,6 +2606,7 @@ static irqreturn_t int_phy_updown_v2_hw(int irq_no, void *p)
        struct hisi_hba *hisi_hba = p;
        u32 irq_msk;
        int phy_no = 0;
+       irqreturn_t res = IRQ_NONE;
 
        irq_msk = (hisi_sas_read32(hisi_hba, HGC_INVLD_DQE_INFO)
                   >> HGC_INVLD_DQE_INFO_FB_CH0_OFF) & 0x1ff;
@@ -2620,15 +2621,15 @@ static irqreturn_t int_phy_updown_v2_hw(int irq_no, void *p)
                        case CHL_INT0_SL_PHY_ENABLE_MSK:
                                /* phy up */
                                if (phy_up_v2_hw(phy_no, hisi_hba) ==
-                                   IRQ_NONE)
-                                       return IRQ_NONE;
+                                   IRQ_HANDLED)
+                                       res = IRQ_HANDLED;
                                break;
 
                        case CHL_INT0_NOT_RDY_MSK:
                                /* phy down */
                                if (phy_down_v2_hw(phy_no, hisi_hba) ==
-                                   IRQ_NONE)
-                                       return IRQ_NONE;
+                                   IRQ_HANDLED)
+                                       res = IRQ_HANDLED;
                                break;
 
                        case (CHL_INT0_NOT_RDY_MSK |
@@ -2638,13 +2639,13 @@ static irqreturn_t int_phy_updown_v2_hw(int irq_no, void *p)
                                if (reg_value & BIT(phy_no)) {
                                        /* phy up */
                                        if (phy_up_v2_hw(phy_no, hisi_hba) ==
-                                           IRQ_NONE)
-                                               return IRQ_NONE;
+                                           IRQ_HANDLED)
+                                               res = IRQ_HANDLED;
                                } else {
                                        /* phy down */
                                        if (phy_down_v2_hw(phy_no, hisi_hba) ==
-                                           IRQ_NONE)
-                                               return IRQ_NONE;
+                                           IRQ_HANDLED)
+                                               res = IRQ_HANDLED;
                                }
                                break;
 
@@ -2657,7 +2658,7 @@ static irqreturn_t int_phy_updown_v2_hw(int irq_no, void *p)
                phy_no++;
        }
 
-       return IRQ_HANDLED;
+       return res;
 }
 
 static void phy_bcast_v2_hw(int phy_no, struct hisi_hba *hisi_hba)