scsi: hisi_sas: Fix phyup timeout on FPGA

The OOB interrupt and phyup interrupt handlers may run out-of-order in high
CPU usage scenarios. Since the hisi_sas_phy.timer is added in
hisi_sas_phy_oob_ready() and disarmed in phy_up_v3_hw(), this out-of-order
execution will cause hisi_sas_phy.timer timeout to trigger.

To solve, protect hisi_sas_phy.timer and .attached with a lock, and ensure
that the timer won't be added after phyup handler completes.

Link: https://lore.kernel.org/r/1639579061-179473-8-git-send-email-john.garry@huawei.comSigned-off-by: Qi Liu <liuqi115@huawei.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_main.c

@@ -909,10 +909,14 @@ void hisi_sas_phy_oob_ready(struct hisi_hba *hisi_hba, int phy_no)
 {
 	struct hisi_sas_phy *phy = &hisi_hba->phy[phy_no];
 	struct device *dev = hisi_hba->dev;
+	unsigned long flags;
 
 	dev_dbg(dev, "phy%d OOB ready\n", phy_no);
-	if (phy->phy_attached)
+	spin_lock_irqsave(&phy->lock, flags);
+	if (phy->phy_attached) {
+		spin_unlock_irqrestore(&phy->lock, flags);
 		return;
+	}
 
 	if (!timer_pending(&phy->timer)) {
 		if (phy->wait_phyup_cnt < HISI_SAS_WAIT_PHYUP_RETRIES) {
@@ -920,13 +924,17 @@ void hisi_sas_phy_oob_ready(struct hisi_hba *hisi_hba, int phy_no)
 			phy->timer.expires = jiffies +
 					     HISI_SAS_WAIT_PHYUP_TIMEOUT;
 			add_timer(&phy->timer);
-		} else {
-			dev_warn(dev, "phy%d failed to come up %d times, giving up\n",
-				 phy_no, phy->wait_phyup_cnt);
-			phy->wait_phyup_cnt = 0;
+			spin_unlock_irqrestore(&phy->lock, flags);
+			return;
 		}
+
+		dev_warn(dev, "phy%d failed to come up %d times, giving up\n",
+			 phy_no, phy->wait_phyup_cnt);
+		phy->wait_phyup_cnt = 0;
 	}
+	spin_unlock_irqrestore(&phy->lock, flags);
 }
+
 EXPORT_SYMBOL_GPL(hisi_sas_phy_oob_ready);
 
 static void hisi_sas_phy_init(struct hisi_hba *hisi_hba, int phy_no)

drivers/scsi/hisi_sas/hisi_sas_v3_hw.c

@@ -1484,7 +1484,6 @@ static irqreturn_t phy_up_v3_hw(int phy_no, struct hisi_hba *hisi_hba)
 	struct asd_sas_phy *sas_phy = &phy->sas_phy;
 	struct device *dev = hisi_hba->dev;
 
-	del_timer(&phy->timer);
 	hisi_sas_phy_write32(hisi_hba, phy_no, PHYCTRL_PHY_ENA_MSK, 1);
 
 	port_id = hisi_sas_read32(hisi_hba, PHY_PORT_NUM_MA);
@@ -1561,9 +1560,16 @@ static irqreturn_t phy_up_v3_hw(int phy_no, struct hisi_hba *hisi_hba)
 	}
 
 	phy->port_id = port_id;
-	phy->phy_attached = 1;
+
 	hisi_sas_notify_phy_event(phy, HISI_PHYE_PHY_UP);
+
 	res = IRQ_HANDLED;
+
+	spin_lock(&phy->lock);
+	/* Delete timer and set phy_attached atomically */
+	del_timer(&phy->timer);
+	phy->phy_attached = 1;
+	spin_unlock(&phy->lock);
 end:
 	if (phy->reset_completion)
 		complete(phy->reset_completion);