scsi: ibmvfc: Do not wait for initial device scan

The initial device scan might take some time, and there really is no need
to wait for it during probe().  So return immediately from scsi_scan_host()
during probe() and avoid any udev stalls during booting.

Link: https://lore.kernel.org/r/20210817075306.11315-1-mwilck@suse.comAcked-by: Tyrel Datwyler <tyreld@linux.ibm.com>
Signed-off-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Martin Wilck <mwilck@suse.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/ibmvscsi/ibmvfc.c

@@ -3292,14 +3292,18 @@ static int ibmvfc_scan_finished(struct Scsi_Host *shost, unsigned long time)
 	int done = 0;
 
 	spin_lock_irqsave(shost->host_lock, flags);
-	if (time >= (init_timeout * HZ)) {
+	if (!vhost->scan_timeout)
+		done = 1;
+	else if (time >= (vhost->scan_timeout * HZ)) {
 		dev_info(vhost->dev, "Scan taking longer than %d seconds, "
-			 "continuing initialization\n", init_timeout);
+			 "continuing initialization\n", vhost->scan_timeout);
 		done = 1;
 	}
 
-	if (vhost->scan_complete)
+	if (vhost->scan_complete) {
+		vhost->scan_timeout = init_timeout;
 		done = 1;
+	}
 	spin_unlock_irqrestore(shost->host_lock, flags);
 	return done;
 }
@@ -6084,6 +6088,7 @@ static int ibmvfc_probe(struct vio_dev *vdev, const struct vio_device_id *id)
 	vhost->client_scsi_channels = min(shost->nr_hw_queues, nr_scsi_channels);
 	vhost->using_channels = 0;
 	vhost->do_enquiry = 1;
+	vhost->scan_timeout = 0;
 
 	strcpy(vhost->partition_name, "UNKNOWN");
 	init_waitqueue_head(&vhost->work_wait_q);

drivers/scsi/ibmvscsi/ibmvfc.h

@@ -876,6 +876,7 @@ struct ibmvfc_host {
 	int reinit;
 	int delay_init;
 	int scan_complete;
+	int scan_timeout;
 	int logged_in;
 	int mq_enabled;
 	int using_channels;