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

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Date:	Wed, 22 Jun 2016 09:14:49 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Joseph Salisbury <joseph.salisbury@...onical.com>
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 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