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.com
Acked-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>

diff --git a/drivers/scsi/ibmvscsi/ibmvfc.c b/drivers/scsi/ibmvscsi/ibmvfc.c
index ba7150c..1f1586a 100644 (file)
--- a/drivers/scsi/ibmvscsi/ibmvfc.c
+++ b/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);

diff --git a/drivers/scsi/ibmvscsi/ibmvfc.h b/drivers/scsi/ibmvscsi/ibmvfc.h
index 92fb889..3718406 100644 (file)
--- a/drivers/scsi/ibmvscsi/ibmvfc.h
+++ b/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;