usb: gadget: f_ncm: eliminate abuse of ep->driver data

Since ep->driver_data is not used for endpoint claiming, neither for
enabled/disabled state storing, we can reduce number of places where
we read or modify it's value, as now it has no particular meaning for
function or framework logic.

In case of f_ncm, ep->driver_data was used only for endpoint claiming
and marking endpoints as enabled, so we can simplify code by reducing
it.
Signed-off-by: Robert Baldyga <r.baldyga@samsung.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

drivers/usb/gadget/function/f_ncm.c

@@ -803,10 +803,8 @@ static int ncm_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
 		if (alt != 0)
 			goto fail;
 
-		if (ncm->notify->driver_data) {
-			DBG(cdev, "reset ncm control %d\n", intf);
-			usb_ep_disable(ncm->notify);
-		}
+		DBG(cdev, "reset ncm control %d\n", intf);
+		usb_ep_disable(ncm->notify);
 
 		if (!(ncm->notify->desc)) {
 			DBG(cdev, "init ncm ctrl %d\n", intf);
@@ -814,14 +812,13 @@ static int ncm_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
 				goto fail;
 		}
 		usb_ep_enable(ncm->notify);
-		ncm->notify->driver_data = ncm;
 
 	/* Data interface has two altsettings, 0 and 1 */
 	} else if (intf == ncm->data_id) {
 		if (alt > 1)
 			goto fail;
 
-		if (ncm->port.in_ep->driver_data) {
+		if (ncm->port.in_ep->enabled) {
 			DBG(cdev, "reset ncm\n");
 			ncm->timer_stopping = true;
 			ncm->netdev = NULL;
@@ -885,7 +882,7 @@ static int ncm_get_alt(struct usb_function *f, unsigned intf)
 
 	if (intf == ncm->ctrl_id)
 		return 0;
-	return ncm->port.in_ep->driver_data ? 1 : 0;
+	return ncm->port.in_ep->enabled ? 1 : 0;
 }
 
 static struct sk_buff *package_for_tx(struct f_ncm *ncm)
@@ -1276,15 +1273,14 @@ static void ncm_disable(struct usb_function *f)
 
 	DBG(cdev, "ncm deactivated\n");
 
-	if (ncm->port.in_ep->driver_data) {
+	if (ncm->port.in_ep->enabled) {
 		ncm->timer_stopping = true;
 		ncm->netdev = NULL;
 		gether_disconnect(&ncm->port);
 	}
 
-	if (ncm->notify->driver_data) {
+	if (ncm->notify->enabled) {
 		usb_ep_disable(ncm->notify);
-		ncm->notify->driver_data = NULL;
 		ncm->notify->desc = NULL;
 	}
 }
@@ -1402,19 +1398,16 @@ static int ncm_bind(struct usb_configuration *c, struct usb_function *f)
 	if (!ep)
 		goto fail;
 	ncm->port.in_ep = ep;
-	ep->driver_data = cdev;	/* claim */
 
 	ep = usb_ep_autoconfig(cdev->gadget, &fs_ncm_out_desc);
 	if (!ep)
 		goto fail;
 	ncm->port.out_ep = ep;
-	ep->driver_data = cdev;	/* claim */
 
 	ep = usb_ep_autoconfig(cdev->gadget, &fs_ncm_notify_desc);
 	if (!ep)
 		goto fail;
 	ncm->notify = ep;
-	ep->driver_data = cdev;	/* claim */
 
 	status = -ENOMEM;
 
@@ -1468,14 +1461,6 @@ static int ncm_bind(struct usb_configuration *c, struct usb_function *f)
 		usb_ep_free_request(ncm->notify, ncm->notify_req);
 	}
 
-	/* we might as well release our claims on endpoints */
-	if (ncm->notify)
-		ncm->notify->driver_data = NULL;
-	if (ncm->port.out_ep)
-		ncm->port.out_ep->driver_data = NULL;
-	if (ncm->port.in_ep)
-		ncm->port.in_ep->driver_data = NULL;
-
 	ERROR(cdev, "%s: can't bind, err %d\n", f->name, status);
 
 	return status;