linux-kernel - RE: [PATCH v2] usb: gadget: forbid queuing request to a disabled ep

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Date:	Mon, 14 Dec 2015 10:20:38 +0000
From:	"Du, Changbin" <changbin.du@...el.com>
To:	"balbi@...com" <balbi@...com>
CC:	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"John.Youn@...opsys.com" <John.Youn@...opsys.com>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"lkp@...org" <lkp@...org>, "Wu, Fengguang" <fengguang.wu@...el.com>
Subject: RE: [PATCH v2] usb: gadget: forbid queuing request to a disabled ep

> 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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