scsi: hisi_sas: Directly return when running I_T_nexus reset if phy disabled

At hisi_sas_debug_I_T_nexus_reset(), we call sas_phy_reset() to reset a
phy. But if the phy is disabled, sas_phy_reset() will directly return
-ENODEV without issue a phy reset request.

If so, We can directly return -ENODEV to libsas before issue a phy
reset.

Link: https://lore.kernel.org/r/1567774537-20003-4-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_main.c b/drivers/scsi/hisi_sas/hisi_sas_main.c
index 59c11f4..ffe02f9 100644 (file)
--- a/drivers/scsi/hisi_sas/hisi_sas_main.c
+++ b/drivers/scsi/hisi_sas/hisi_sas_main.c
@@ -1752,6 +1752,11 @@ static int hisi_sas_debug_I_T_nexus_reset(struct domain_device *device)
        DECLARE_COMPLETION_ONSTACK(phyreset);
        int rc, reset_type;
 
+       if (!local_phy->enabled) {
+               sas_put_local_phy(local_phy);
+               return -ENODEV;
+       }
+
        if (scsi_is_sas_phy_local(local_phy)) {
                struct asd_sas_phy *sas_phy =
                        sas_ha->sas_phy[local_phy->number];