scsi: zfcp: fix missing zfcp_port reference put on -EBUSY from port_remove

commit d27e5e0 upstream.

With this early return due to zfcp_unit child(ren), we don't use the
zfcp_port reference from the earlier zfcp_get_port_by_wwpn() anymore and
need to put it.

Signed-off-by: Steffen Maier <[email protected]>
Fixes: d99b601 ("[SCSI] zfcp: restore refcount check on port_remove")
Cc: <[email protected]> #3.7+
Reviewed-by: Jens Remus <[email protected]>
Reviewed-by: Benjamin Block <[email protected]>
Signed-off-by: Martin K. Petersen <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: steffen-maier

drivers/s390/scsi/zfcp_sysfs.c

@@ -263,6 +263,7 @@ static ssize_t zfcp_sysfs_port_remove_store(struct device *dev,
 	if (atomic_read(&port->units) > 0) {
 		retval = -EBUSY;
 		mutex_unlock(&zfcp_sysfs_port_units_mutex);
+		put_device(&port->dev); /* undo zfcp_get_port_by_wwpn() */
 		goto out;
 	}
 	/* port is about to be removed, so no more unit_add */