[PATCH 4.4 280/312] net: hns: fix device reference leaks

[Greg Kroah-Hartman]

From: Johan Hovold <johan@xxxxxxxxxx>

commit 2271150bfb814b72ec57ae2fdf66e39da2eafafd upstream.

Make sure to drop the reference taken by class_find_device() in
hnae_get_handle() on errors and when later releasing the handle.

Fixes: 6fe6611ff275 ("net: add Hisilicon Network Subsystem...")
Cc: Yisen Zhuang <yisen.zhuang@xxxxxxxxxx>
Cc: Salil Mehta <salil.mehta@xxxxxxxxxx>
Signed-off-by: Johan Hovold <johan@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/net/ethernet/hisilicon/hns/hnae.c |    8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

--- a/drivers/net/ethernet/hisilicon/hns/hnae.c
+++ b/drivers/net/ethernet/hisilicon/hns/hnae.c
@@ -331,8 +331,10 @@ struct hnae_handle *hnae_get_handle(stru
 		return ERR_PTR(-ENODEV);
 
 	handle = dev->ops->get_handle(dev, port_id);
-	if (IS_ERR(handle))
+	if (IS_ERR(handle)) {
+		put_device(&dev->cls_dev);
 		return handle;
+	}
 
 	handle->dev = dev;
 	handle->owner_dev = owner_dev;
@@ -355,6 +357,8 @@ out_when_init_queue:
 	for (j = i - 1; j >= 0; j--)
 		hnae_fini_queue(handle->qs[j]);
 
+	put_device(&dev->cls_dev);
+
 	return ERR_PTR(-ENOMEM);
 }
 EXPORT_SYMBOL(hnae_get_handle);
@@ -376,6 +380,8 @@ void hnae_put_handle(struct hnae_handle
 		dev->ops->put_handle(h);
 
 	module_put(dev->owner);
+
+	put_device(&dev->cls_dev);
 }
 EXPORT_SYMBOL(hnae_put_handle);