linux-kernel - Re: [PATCH] usb:cdns3: Fix for CV CH9 running with g

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Message-ID: <87a7abv1f2.fsf@gmail.com>
Date:   Tue, 08 Oct 2019 15:58:57 +0300
From:   Felipe Balbi <felipe.balbi@...ux.intel.com>
To:     Peter Chen <peter.chen@....com>,
        Pawel Laszczak <pawell@...ence.com>
Cc:     "gregkh\@linuxfoundation.org" <gregkh@...uxfoundation.org>,
        "linux-usb\@vger.kernel.org" <linux-usb@...r.kernel.org>,
        "rogerq\@ti.com" <rogerq@...com>,
        "linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>,
        "jbergsagel\@ti.com" <jbergsagel@...com>,
        "nsekhar\@ti.com" <nsekhar@...com>, "nm\@ti.com" <nm@...com>,
        "sureshp\@cadence.com" <sureshp@...ence.com>,
        "kurahul\@cadence.com" <kurahul@...ence.com>
Subject: Re: [PATCH] usb:cdns3: Fix for CV CH9 running with g_zero driver.


Hi,

Peter Chen <peter.chen@....com> writes:
> On 19-10-07 07:39:11, Pawel Laszczak wrote:
>> Patch fixes issue with Halt Endnpoint Test observed
>
> %s/Endnpoint/Endpoint
>
>>
>> during using g_zero
>> driver as DUT. Bug occurred only on some testing board.
>
> g_zero is legacy, please use configfs function source_sink or loopback
> instead.

We still want fixes for those ;-)

>> Endpoint can defer transition to Halted state if endpoint has pending
>> requests.
>
> The implementation of halt handling is a little complicated, you may
> consider return -EAGAIN for functional stall through usb_ep_set_halt
> from function driver if the requests are pending, it doesn't need to
> defer such kinds of functional stall.

-EAGAIN, IIRC is only supposed to be used for IN endpoint stalls.

-- 
balbi

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