[PATCH 5/6] scsi: zfcp: move the position of put_device

Benjamin Block
2021-04-14T17:10:29Z

From: Qinglang Miao <miaoqinglang@huawei.com>

Have the `put_device()` call after `device_unregister()` in both
`zfcp_unit_remove()` and `zfcp_sysfs_port_remove_store()` to make
it more natural, for put_device() ought to be the last time we
touch the object in both functions.

And add comments after put_device to make codes clearer.

Suggested-by: Steffen Maier <maier@linux.ibm.com>
Suggested-by: Benjamin Block <bblock@linux.ibm.com>
Signed-off-by: Qinglang Miao <miaoqinglang@huawei.com>
Signed-off-by: Benjamin Block <bblock@linux.ibm.com>
---
drivers/s390/scsi/zfcp_sysfs.c | 4 ++--
drivers/s390/scsi/zfcp_unit.c | 4 ++--
2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/s390/scsi/zfcp_sysfs.c b/drivers/s390/scsi/zfcp_sysfs.c
index f76946dcbd59..544efd4c42f0 100644
--- a/drivers/s390/scsi/zfcp_sysfs.c
+++ b/drivers/s390/scsi/zfcp_sysfs.c
@@ -327,10 +327,10 @@ static ssize_t zfcp_sysfs_port_remove_store(struct device *dev,
list_del(&port->list);
write_unlock_irq(&adapter->port_list_lock);

- put_device(&port->dev);
-
zfcp_erp_port_shutdown(port, 0, "syprs_1");
device_unregister(&port->dev);
+
+ put_device(&port->dev); /* undo zfcp_get_port_by_wwpn() */
out:
zfcp_ccw_adapter_put(adapter);
return retval ? retval : (ssize_t) count;
diff --git a/drivers/s390/scsi/zfcp_unit.c b/drivers/s390/scsi/zfcp_unit.c
index e67bf7388cae..59333f0257a8 100644
--- a/drivers/s390/scsi/zfcp_unit.c
+++ b/drivers/s390/scsi/zfcp_unit.c
@@ -255,9 +255,9 @@ int zfcp_unit_remove(struct zfcp_port *port, u64 fcp_lun)
scsi_device_put(sdev);
}

- put_device(&unit->dev);
-
device_unregister(&unit->dev);

+ put_device(&unit->dev); /* undo _zfcp_unit_find() */
+
return 0;
}
--
2.30.2