usb: renesas_usbhs: Use struct platform_callback pointer

Now the driver fixes the issue of the commit 48298206 ("usb:
gadget: renesas_usbhs: bugfix: don't modify platform data") by
using usbhs_mod_info.get_vbus, this patches uses the pointer
instead of copied value to avoid redundancy. Note that struct
renesas_usbhs_driver_param has to use copied value because
the driver has to set some members (e.g. buswait_bwait).
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/renesas_usbhs/common.c

@@ -53,8 +53,8 @@
  */
 #define usbhs_platform_call(priv, func, args...)\
 	(!(priv) ? -ENODEV :			\
-	 !((priv)->pfunc.func) ? 0 :		\
-	 (priv)->pfunc.func(args))
+	 !((priv)->pfunc->func) ? 0 :		\
+	 (priv)->pfunc->func(args))
 
 /*
  *		common functions
@@ -644,7 +644,7 @@ static int usbhs_probe(struct platform_device *pdev)
 		dev_err(dev, "no platform callbacks\n");
 		return -EINVAL;
 	}
-	priv->pfunc = info->platform_callback;
+	priv->pfunc = &info->platform_callback;
 
 	/* set default param if platform doesn't have */
 	if (usbhs_get_dparam(priv, has_new_pipe_configs)) {
@@ -665,7 +665,7 @@ static int usbhs_probe(struct platform_device *pdev)
 
 	/* FIXME */
 	/* runtime power control ? */
-	if (priv->pfunc.get_vbus)
+	if (priv->pfunc->get_vbus)
 		usbhs_get_dparam(priv, runtime_pwctrl) = 1;
 
 	/*

drivers/usb/renesas_usbhs/common.h

@@ -252,7 +252,7 @@ struct usbhs_priv {
 	unsigned int irq;
 	unsigned long irqflags;
 
-	struct renesas_usbhs_platform_callback	pfunc;
+	const struct renesas_usbhs_platform_callback *pfunc;
 	struct renesas_usbhs_driver_param	dparam;
 
 	struct delayed_work notify_hotplug_work;

drivers/usb/renesas_usbhs/mod.c

@@ -52,7 +52,7 @@ void usbhs_mod_non_autonomy_mode(struct usbhs_priv *priv)
 {
 	struct usbhs_mod_info *info = usbhs_priv_to_modinfo(priv);
 
-	info->get_vbus = priv->pfunc.get_vbus;
+	info->get_vbus = priv->pfunc->get_vbus;
 }
 
 /*