USB: musb: do not work if no gadget driver is loaded

On OTG and gadget-only configurations, we need a gadget driver
in order to work properly, so avoid changing operation modes
when there's no gadget driver loaded.

Signed-off-by: Felipe Balbi <felipe.balbi@nokia.com>
Cc: David Brownell <dbrownell@users.sourceforge.net>
Acked-by: Anand Gadiyar <gadiyar@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c
index 1041bb7..24ff097 100644 (file)
--- a/drivers/usb/musb/musb_core.c
+++ b/drivers/usb/musb/musb_core.c
@@ -1521,6 +1521,14 @@ irqreturn_t musb_interrupt(struct musb *musb)
                (devctl & MUSB_DEVCTL_HM) ? "host" : "peripheral",
                musb->int_usb, musb->int_tx, musb->int_rx);
 
+#ifdef CONFIG_USB_GADGET_MUSB_HDRC
+       if (is_otg_enabled(musb) || is_peripheral_enabled(musb))
+               if (!musb->gadget_driver) {
+                       DBG(5, "No gadget driver loaded\n");
+                       return IRQ_HANDLED;
+               }
+#endif
+
        /* the core can interrupt us for multiple reasons; docs have
         * a generic interrupt flowchart to follow
         */