USB: otg: add otg_put_transceiver()

As Russell King points out, calling put_device(otg_transceiver->dev)
directly in driver cleanup paths makes assumptions about otg_transceiver
internals.

Signed-off-by: Philipp Zabel <philipp.zabel@gmail.com>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

arch/arm/plat-omap/usb.c

@@ -96,6 +96,12 @@ struct otg_transceiver *otg_get_transceiver(void)
 }
 EXPORT_SYMBOL(otg_get_transceiver);
 
+void otg_put_transceiver(struct otg_transceiver *x)
+{
+	put_device(x->dev);
+}
+EXPORT_SYMBOL(otg_put_transceiver);
+
 int otg_set_transceiver(struct otg_transceiver *x)
 {
 	if (xceiv && x)

drivers/usb/gadget/omap_udc.c

@@ -3006,7 +3006,7 @@ static int __init omap_udc_probe(struct platform_device *pdev)
 
 cleanup0:
 	if (xceiv)
-		put_device(xceiv->dev);
+		otg_put_transceiver(xceiv);
 
 	if (cpu_is_omap16xx() || cpu_is_omap24xx()) {
 		clk_disable(hhc_clk);
@@ -3034,7 +3034,7 @@ static int __exit omap_udc_remove(struct platform_device *pdev)
 
 	pullup_disable(udc);
 	if (udc->transceiver) {
-		put_device(udc->transceiver->dev);
+		otg_put_transceiver(udc->transceiver);
 		udc->transceiver = NULL;
 	}
 	omap_writew(0, UDC_SYSCON1);

include/linux/usb/otg.h

@@ -84,6 +84,7 @@ extern int otg_set_transceiver(struct otg_transceiver *);
 
 /* for usb host and peripheral controller drivers */
 extern struct otg_transceiver *otg_get_transceiver(void);
+extern void otg_put_transceiver(struct otg_transceiver *);
 
 static inline int
 otg_start_hnp(struct otg_transceiver *otg)