5.4-stable review patch. If anyone has any objections, please let me know.
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From: Peter Oberparleiter oberpar@linux.ibm.com
commit 9697ca0d53e3db357be26d2414276143c4a2cd49 upstream.
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 Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/s390/scsi/zfcp_sysfs.c | 2 ++ 1 file changed, 2 insertions(+)
--- a/drivers/s390/scsi/zfcp_sysfs.c +++ b/drivers/s390/scsi/zfcp_sysfs.c @@ -355,6 +355,8 @@ static ssize_t zfcp_sysfs_unit_add_store 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;