scsi: iscsi: Change iSCSI workqueue max_active back to 1

Commit 3ce41966 ("scsi: iscsi: Register sysfs for iscsi workqueue")
enabled 'cpumask' support for iSCSI workqueues. However, it is unnecessary
to set max_active = 2 since 'cpumask' can still be modified when max_active
is 1.

This patch sets max_active to 1 so as to keep the same behaviour as before.

Link: https://lore.kernel.org/r/20200701030745.16897-1-bob.liu@oracle.comReviewed-by: Mike Christie <michael.christie@oracle.com>
Signed-off-by: Bob Liu <bob.liu@oracle.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/libiscsi.c

@@ -2629,7 +2629,7 @@ struct Scsi_Host *iscsi_host_alloc(struct scsi_host_template *sht,
 			"iscsi_q_%d", shost->host_no);
 		ihost->workq = alloc_workqueue("%s",
 			WQ_SYSFS | __WQ_LEGACY | WQ_MEM_RECLAIM | WQ_UNBOUND,
-			2, ihost->workq_name);
+			1, ihost->workq_name);
 		if (!ihost->workq)
 			goto free_host;
 	}

drivers/scsi/scsi_transport_iscsi.c

@@ -4760,7 +4760,7 @@ static __init int iscsi_transport_init(void)
 
 	iscsi_eh_timer_workq = alloc_workqueue("%s",
 			WQ_SYSFS | __WQ_LEGACY | WQ_MEM_RECLAIM | WQ_UNBOUND,
-			2, "iscsi_eh");
+			1, "iscsi_eh");
 	if (!iscsi_eh_timer_workq) {
 		err = -ENOMEM;
 		goto release_nls;