scsi: s390: zfcp: Ensure synchronous unit_add

jira KERNEL-325
Rebuild_History Non-Buildable kernel-4.18.0-553.89.1.el8_10
commit-author Peter Oberparleiter <oberpar@linux.ibm.com>
commit 9697ca0

Improve the usability of the unit_add sysfs attribute by ensuring that
the associated FCP LUN scan processing is completed synchronously.  This
enables configuration tooling to consistently determine the end of the
scan process to allow for serialization of follow-on actions.

While the scan process associated with unit_add typically completes
synchronously, it is deferred to an asynchronous background process if
unit_add is used before initial remote port scanning has completed.  This
occurs when unit_add is used immediately after setting the associated FCP
device online.

To ensure synchronous unit_add processing, wait for remote port scanning
to complete before initiating the FCP LUN scan.

	Cc: stable@vger.kernel.org
	Reviewed-by: M Nikhil <nikh1092@linux.ibm.com>
	Reviewed-by: Nihar Panda <niharp@linux.ibm.com>
	Signed-off-by: Peter Oberparleiter <oberpar@linux.ibm.com>
	Signed-off-by: Nihar Panda <niharp@linux.ibm.com>
Link: https://lore.kernel.org/r/20250603182252.2287285-2-niharp@linux.ibm.com
	Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
(cherry picked from commit 9697ca0)
	Signed-off-by: Jonathan Maple <jmaple@ciq.com>

Author: PlaidCat

drivers/s390/scsi/zfcp_sysfs.c

@@ -450,6 +450,8 @@ static ssize_t zfcp_sysfs_unit_add_store(struct device *dev,
 	if (kstrtoull(buf, 0, (unsigned long long *) &fcp_lun))
 		return -EINVAL;
 
+	flush_work(&port->rport_work);
+
 	retval = zfcp_unit_add(port, fcp_lun);
 	if (retval)
 		return retval;