[PATCH v3 4/6] usb: cdns3: gadget: fix possible memory leak

[Peter Chen <peter.chen@xxxxxxx>]

If cdns3_gadget_start is failed, it never frees cdns3_device structure.
Meanwhile, there is no release function for gadget device, it causes
there is no sync with driver core.

To fix this, we add release function for gadget device, and free
cdns3_device structure at there. Meanwhile, With the new UDC core
APIs, we could work with driver core better to handle memory leak
issue.

Signed-off-by: Peter Chen <peter.chen@xxxxxxx>
---
 drivers/usb/cdns3/gadget.c | 21 ++++++++++++++++-----
 1 file changed, 16 insertions(+), 5 deletions(-)

diff --git a/drivers/usb/cdns3/gadget.c b/drivers/usb/cdns3/gadget.c
index 8bbb38cd560b..382da6667442 100644
--- a/drivers/usb/cdns3/gadget.c
+++ b/drivers/usb/cdns3/gadget.c
@@ -2988,6 +2988,15 @@ static int cdns3_init_eps(struct cdns3_device *priv_dev)
 	return -ENOMEM;
 }
 
+static void cdns3_gadget_release(struct device *dev)
+{
+	struct usb_gadget *gadget = container_of(dev, struct usb_gadget, dev);
+	struct cdns3_device *priv_dev = container_of(gadget,
+			struct cdns3_device, gadget);
+
+	kfree(priv_dev);
+}
+
 void cdns3_gadget_exit(struct cdns3 *cdns)
 {
 	struct cdns3_device *priv_dev;
@@ -2999,7 +3008,7 @@ void cdns3_gadget_exit(struct cdns3 *cdns)
 	pm_runtime_mark_last_busy(cdns->dev);
 	pm_runtime_put_autosuspend(cdns->dev);
 
-	usb_del_gadget_udc(&priv_dev->gadget);
+	usb_del_gadget(&priv_dev->gadget);
 
 	cdns3_free_all_eps(priv_dev);
 
@@ -3019,7 +3028,7 @@ void cdns3_gadget_exit(struct cdns3 *cdns)
 			  priv_dev->setup_dma);
 
 	kfree(priv_dev->zlp_buf);
-	kfree(priv_dev);
+	usb_put_gadget(&priv_dev->gadget);
 	cdns->gadget_dev = NULL;
 	cdns3_drd_gadget_off(cdns);
 }
@@ -3034,6 +3043,8 @@ static int cdns3_gadget_start(struct cdns3 *cdns)
 	if (!priv_dev)
 		return -ENOMEM;
 
+	usb_initialize_gadget(cdns->dev, &priv_dev->gadget,
+			cdns3_gadget_release);
 	cdns->gadget_dev = priv_dev;
 	priv_dev->sysdev = cdns->dev;
 	priv_dev->dev = cdns->dev;
@@ -3121,10 +3132,9 @@ static int cdns3_gadget_start(struct cdns3 *cdns)
 	}
 
 	/* add USB gadget device */
-	ret = usb_add_gadget_udc(priv_dev->dev, &priv_dev->gadget);
+	ret = usb_add_gadget(&priv_dev->gadget);
 	if (ret < 0) {
-		dev_err(priv_dev->dev,
-			"Failed to register USB device controller\n");
+		dev_err(priv_dev->dev, "Failed to add gadget\n");
 		goto err4;
 	}
 
@@ -3137,6 +3147,7 @@ static int cdns3_gadget_start(struct cdns3 *cdns)
 err2:
 	cdns3_free_all_eps(priv_dev);
 err1:
+	usb_put_gadget(&priv_dev->gadget);
 	cdns->gadget_dev = NULL;
 	return ret;
 }
-- 
2.17.1