From owner-freebsd-arm@freebsd.org  Sun Sep 17 08:59:06 2017
Return-Path: <owner-freebsd-arm@freebsd.org>
Delivered-To: freebsd-arm@mailman.ysv.freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org
 [IPv6:2001:1900:2254:206a::19:1])
 by mailman.ysv.freebsd.org (Postfix) with ESMTP id 54E7DE048C1
 for <freebsd-arm@mailman.ysv.freebsd.org>;
 Sun, 17 Sep 2017 08:59:06 +0000 (UTC) (envelope-from hps@selasky.org)
Received: from mail.turbocat.net (turbocat.net [88.99.82.50])
 (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
 (Client did not present a certificate)
 by mx1.freebsd.org (Postfix) with ESMTPS id 1A83777BDC
 for <freebsd-arm@freebsd.org>; Sun, 17 Sep 2017 08:59:05 +0000 (UTC)
 (envelope-from hps@selasky.org)
Received: from hps2016.home.selasky.org (unknown [62.141.129.119])
 (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits))
 (No client certificate requested)
 by mail.turbocat.net (Postfix) with ESMTPSA id 077582606E1;
 Sun, 17 Sep 2017 10:58:56 +0200 (CEST)
Subject: Re: Part of why Pine64+ 2GB gets "uhub_attach: getting USB 2.0 HUB
 descriptor failed,error=USB_ERR_SHORT_XFER" (and so USB fails)
To: Mark Millard <markmi@dsl-only.net>, freebsd-arm <freebsd-arm@freebsd.org>
References: <AF0AC3CE-5B33-4E28-B091-FCE9EAC87642@dsl-only.net>
From: Hans Petter Selasky <hps@selasky.org>
Message-ID: <46d91194-84ff-50e3-97e6-6f9cef3ea2e7@selasky.org>
Date: Sun, 17 Sep 2017 10:56:27 +0200
User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:52.0) Gecko/20100101
 Thunderbird/52.2.1
MIME-Version: 1.0
In-Reply-To: <AF0AC3CE-5B33-4E28-B091-FCE9EAC87642@dsl-only.net>
Content-Type: text/plain; charset=utf-8; format=flowed
Content-Language: en-US
Content-Transfer-Encoding: 7bit
X-BeenThere: freebsd-arm@freebsd.org
X-Mailman-Version: 2.1.23
Precedence: list
List-Id: "Porting FreeBSD to ARM processors." <freebsd-arm.freebsd.org>
List-Unsubscribe: <https://lists.freebsd.org/mailman/options/freebsd-arm>,
 <mailto:freebsd-arm-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-arm/>
List-Post: <mailto:freebsd-arm@freebsd.org>
List-Help: <mailto:freebsd-arm-request@freebsd.org?subject=help>
List-Subscribe: <https://lists.freebsd.org/mailman/listinfo/freebsd-arm>,
 <mailto:freebsd-arm-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Sun, 17 Sep 2017 08:59:06 -0000

On 09/17/17 10:09, Mark Millard wrote:
> . . .
>          uint16_t length;
>          uint16_t temp;
> . . .
>          length = UGETW(req->wLength);
> . . .
>                  USB_BUS_LOCK(udev->bus);
>                  err = (hr_func) (udev, req, &desc, &temp);
>                  USB_BUS_UNLOCK(udev->bus);
> 
>                  if (err)
>                          goto done;
> 
>                  if (length > temp) {
>                          if (!(flags & USB_SHORT_XFER_OK)) {
>                                  err = USB_ERR_SHORT_XFER;
>                                  goto done;
>                          }
>                          length = temp;
>                  }

Can you dump the length arguments. Usually short transfer means that the 
descriptor was shorter than expected.

--HPS