linux-kernel - Re: [v4.2-rc1 Regression] usb: Enable LPM for USB 2.01+ full-speed devices

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Message-ID: <576D2255.5000703@canonical.com>
Date:	Fri, 24 Jun 2016 08:06:45 -0400
From:	Joseph Salisbury <joseph.salisbury@...onical.com>
To:	Greg KH <gregkh@...uxfoundation.org>
Cc:	rtatiya@...eaurora.org,
	Robert Ancell <robert.ancell@...onical.com>,
	Alan Stern <stern@...land.harvard.edu>,
	"mathias.nyman@...ux.intel.com" <mathias.nyman@...ux.intel.com>,
	chasemetzger15@...il.com, baolu.lu@...ux.intel.com,
	oneukum@...e.com, kborer@...il.com, jun.li@...escale.com,
	USB list <linux-usb@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [v4.2-rc1 Regression] usb: Enable LPM for USB 2.01+ full-speed
 devices

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@...eaurora.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.