linux-kernel - RE: [PATCH 0/2] Two fix for dwc2 gadget driver

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Date:	Thu, 3 Dec 2015 04:23:09 +0000
From:	"Du, Changbin" <changbin.du@...el.com>
To:	John Youn <John.Youn@...opsys.com>
CC:	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"balbi@...com" <balbi@...com>
Subject: RE: [PATCH 0/2] Two fix for dwc2 gadget driver

> On 11/29/2015 9:29 PM, changbin.du@...el.com wrote:
> > From: "Du, Changbin" <changbin.du@...el.com>
> >
> > With the first patch, enable a enabled ep will return -EBUSY.
> > The second patch forbid queuing on disabled ep to avoid panic.
> 
> 
> The usb_ep->enabled flag was added in 4.4.
> 
> It looks like these same checks are also added at the API level in the
> usb_ep_enable() and usb_ep_disable().
> 
> In case this is bypassed we should probably add them in the gadget
> anyways but using the existing flag.
> 
> Regards,
> John
> 
Hmm, just learnt the flag on gadget API layer. And I just see usb_ep_enable return success if it is already enabled.
But I think it should return an error to inform the caller. Because the ep configuration may probably be changed.
In this case, usb_ep_enable will do different behavior.

Hmm, the usb_ep_queue doesn't check the enabled flag. Should be added. Let me have a try.

Best Regards,
Changbin
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