Re: Linux USB file storage gadget with new UDC

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On Fri, 12 Jul 2013, Felipe Balbi wrote:

> > As can be seen in the gadget driver log below, after Set-Config
> > request is received, another two more requests are received before
> > handle_exception() is called. If there is a way to call
> > handle_exception() immediately after Set-Config request, it would be
> > very helpful.
> 
> this is clearly a bug in your driver, host wouldn't send you more
> requests unless you acknowledge the previous one.

I agree; the UDC must have told the host that the request was 
already complete.

> You should be naking
> those extra requests until you're ready to ack.

Well, that's not quite right.  Devices cannot NAK new control requests;  
a NAK is not a valid response to a SETUP packet.

> Frankly, we have quite a few UDC drivers passing all USBCV tests.

Alan Stern

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