From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
	id S1752515AbcF1PJq (ORCPT <rfc822;w@1wt.eu>);
	Tue, 28 Jun 2016 11:09:46 -0400
Received: from youngberry.canonical.com ([91.189.89.112]:38840 "EHLO
	youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
	with ESMTP id S1752178AbcF1PJo (ORCPT
	<rfc822;linux-kernel@vger.kernel.org>);
	Tue, 28 Jun 2016 11:09:44 -0400
Subject: Re: [v4.2-rc1 Regression] usb: Enable LPM for USB 2.01+ full-speed
 devices
To: Greg KH <gregkh@linuxfoundation.org>
References: <576AB103.4060301@canonical.com>
 <20160622161449.GA27573@kroah.com> <576D2255.5000703@canonical.com>
Cc: rtatiya@codeaurora.org, Robert Ancell <robert.ancell@canonical.com>,
        Alan Stern <stern@rowland.harvard.edu>,
        "mathias.nyman@linux.intel.com" <mathias.nyman@linux.intel.com>,
        chasemetzger15@gmail.com, baolu.lu@linux.intel.com, oneukum@suse.com,
        kborer@gmail.com, jun.li@freescale.com,
        USB list <linux-usb@vger.kernel.org>,
        LKML <linux-kernel@vger.kernel.org>
From: Joseph Salisbury <joseph.salisbury@canonical.com>
Message-ID: <57729332.8040104@canonical.com>
Date: Tue, 28 Jun 2016 11:09:38 -0400
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101
 Thunderbird/38.8.0
MIME-Version: 1.0
In-Reply-To: <576D2255.5000703@canonical.com>
Content-Type: text/plain; charset=windows-1252
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

On 06/24/2016 08:06 AM, Joseph Salisbury wrote:
> On 06/22/2016 12:14 PM, Greg KH wrote:
>> On Wed, Jun 22, 2016 at 11:38:43AM -0400, Joseph Salisbury wrote:
>>> Hi Rupesh,
>>>
>>> A kernel bug report was opened against Ubuntu [0].  After a kernel
>>> bisect, it was found that reverting the following commit resolved this bug:
>>>
>>> commit a8425292816ceaa8c49e29d2114e85d85a73e080
>>> Author: Rupesh Tatiya <rtatiya@codeaurora.org>
>>> Date:   Tue Apr 14 16:36:55 2015 +0530
>>>
>>>     usb: Enable LPM for USB 2.01+ full-speed devices
>>>
>>>
>>> The regression was introduced as of v4.2-rc1.
>>>
>>> I was hoping to get your feedback, since you are the patch author.  Do
>>> you think gathering any additional data will help diagnose this issue,
>>> or would it be best to submit a revert request?
>> Does the problem still happen with 4.7-rc4 or even 4.6?
>>
>> 4.2 is pretty old and obsolete you know :)
>>
>> thanks,
>>
>> greg k-h
> The regression does exist in 4.6-rc2.  I'll have the latest mainline
> 4.7-rc4 kernel tested.
The 4.7-rc4 kernel still exhibits the bug.