> diff --git a/include/linux/usb/gadget.h b/include/linux/usb/gadget.h
> index 3d583a1..b566a4b 100644
> --- a/include/linux/usb/gadget.h
> +++ b/include/linux/usb/gadget.h
> @@ -402,6 +402,9 @@ static inline void usb_ep_free_request(struct usb_ep
> *ep,
> static inline int usb_ep_queue(struct usb_ep *ep,
> struct usb_request *req, gfp_t gfp_flags)
> {
> + if (WARN_ON_ONCE(!ep->enabled))
> + return -ESHUTDOWN;
> +
> return ep->ops->queue(ep, req, gfp_flags);
> }
>
> --
> 2.5.0
With this patch, ep0 transfer breaks. it because the 'enabled' of ep0 is not set. Ep0
is not enabled by usb_ep_enable, but in UDC driver. So there need another patch
to set ep0's flag also.
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