scsi: hisi_sas: Put a limit of link reset retries

If an OOB event is received but the phy still fails to come up, a link
reset will be issued repeatedly at an interval of 20s until the phy comes
up.

Set a limit for link reset issue retries to avoid printing the timeout
message endlessly.

Link: https://lore.kernel.org/r/1623058179-80434-2-git-send-email-john.garry@huawei.com
Signed-off-by: Luo Jiaxing <luojiaxing@huawei.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.h b/drivers/scsi/hisi_sas/hisi_sas.h
index cf879cc..8e36ede 100644 (file)
--- a/drivers/scsi/hisi_sas/hisi_sas.h
+++ b/drivers/scsi/hisi_sas/hisi_sas.h
@@ -185,6 +185,7 @@ struct hisi_sas_phy {
        enum sas_linkrate       minimum_linkrate;
        enum sas_linkrate       maximum_linkrate;
        int enable;
+       int wait_phyup_cnt;
        atomic_t down_cnt;
 
        /* Trace FIFO */

diff --git a/drivers/scsi/hisi_sas/hisi_sas_main.c b/drivers/scsi/hisi_sas/hisi_sas_main.c
index 5a20407..5042074 100644 (file)
--- a/drivers/scsi/hisi_sas/hisi_sas_main.c
+++ b/drivers/scsi/hisi_sas/hisi_sas_main.c
@@ -857,6 +857,7 @@ static void hisi_sas_phyup_work(struct work_struct *work)
        struct asd_sas_phy *sas_phy = &phy->sas_phy;
        int phy_no = sas_phy->id;
 
+       phy->wait_phyup_cnt = 0;
        if (phy->identify.target_port_protocols == SAS_PROTOCOL_SSP)
                hisi_hba->hw->sl_notify_ssp(hisi_hba, phy_no);
        hisi_sas_bytes_dmaed(hisi_hba, phy_no, GFP_KERNEL);
@@ -899,6 +900,8 @@ static void hisi_sas_wait_phyup_timedout(struct timer_list *t)
        hisi_sas_notify_phy_event(phy, HISI_PHYE_LINK_RESET);
 }
 
+#define HISI_SAS_WAIT_PHYUP_RETRIES    10
+
 void hisi_sas_phy_oob_ready(struct hisi_hba *hisi_hba, int phy_no)
 {
        struct hisi_sas_phy *phy = &hisi_hba->phy[phy_no];
@@ -909,8 +912,16 @@ void hisi_sas_phy_oob_ready(struct hisi_hba *hisi_hba, int phy_no)
                return;
 
        if (!timer_pending(&phy->timer)) {
-               phy->timer.expires = jiffies + HISI_SAS_WAIT_PHYUP_TIMEOUT * HZ;
-               add_timer(&phy->timer);
+               if (phy->wait_phyup_cnt < HISI_SAS_WAIT_PHYUP_RETRIES) {
+                       phy->wait_phyup_cnt++;
+                       phy->timer.expires = jiffies +
+                                            HISI_SAS_WAIT_PHYUP_TIMEOUT * HZ;
+                       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;
+               }
        }
 }
 EXPORT_SYMBOL_GPL(hisi_sas_phy_oob_ready);