Update Linux to v5.4.2
Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/drivers/s390/scsi/zfcp_unit.c b/drivers/s390/scsi/zfcp_unit.c
index 1bf0a09..e67bf73 100644
--- a/drivers/s390/scsi/zfcp_unit.c
+++ b/drivers/s390/scsi/zfcp_unit.c
@@ -124,7 +124,7 @@
int retval = 0;
mutex_lock(&zfcp_sysfs_port_units_mutex);
- if (atomic_read(&port->units) == -1) {
+ if (zfcp_sysfs_port_is_removing(port)) {
/* port is already gone */
retval = -ENODEV;
goto out;
@@ -168,8 +168,14 @@
write_lock_irq(&port->unit_list_lock);
list_add_tail(&unit->list, &port->unit_list);
write_unlock_irq(&port->unit_list_lock);
+ /*
+ * lock order: shost->scan_mutex before zfcp_sysfs_port_units_mutex
+ * due to zfcp_unit_scsi_scan() => zfcp_scsi_slave_alloc()
+ */
+ mutex_unlock(&zfcp_sysfs_port_units_mutex);
zfcp_unit_scsi_scan(unit);
+ return retval;
out:
mutex_unlock(&zfcp_sysfs_port_units_mutex);