linux-kernel - Re: [PATCH] dwc2: gadget: Fix in control write transfers

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Date:   Mon, 03 Apr 2017 10:05:59 +0300
From:   Felipe Balbi <balbi@...nel.org>
To:     Minas Harutyunyan <Minas.Harutyunyan@...opsys.com>,
        Minas Harutyunyan <Minas.Harutyunyan@...opsys.com>,
        John Youn <John.Youn@...opsys.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "linux-usb\@vger.kernel.org" <linux-usb@...r.kernel.org>,
        "linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] dwc2: gadget: Fix in control write transfers


Hi,

Minas Harutyunyan <Minas.Harutyunyan@...opsys.com> writes:
>> Minas Harutyunyan <Minas.Harutyunyan@...opsys.com> writes:
>>> After data out stage gadget driver should not initate ZLP on control EP,
>>> because it is up to function driver.
>>
>> not true always, depends on return value from ->setup(). Which problem
>> did you have? Which gadget driver? How did you reproduce? Which other
>> tests did you run on this patch?
>>
>
> This required for delayed status support. Tested with Synopsys test 
> gadget. As host used USB tracer traffic generator (different control 
> transfers scenarios). Also performed smoke tests with mass storage 
> function to detect any side effects.

so you didn't test any gadget driver that doesn't rely on
delayed_status, right? Care to test one of those?

The situation here is a little too complex (and we're trying to change
it). Here's how it goes:

if (ctrl->wLength == 0) /* 2-stage ctrl */ {
	gadget_driver always queues STATUS;
} else {
	gadget_driver queues DATA;
        if (result == DELAYED_STATUS)
        	gadgdet_driver queues STATUS
	else
        	UDC handles STATUS
}

It seems to me, you're not handling this properly as of yet. Please make
sure several gadget drivers work for you. Try g_mass_storage and g_zero
at least. :-)

-- 
balbi