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

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Message-ID: <576AB103.4060301@canonical.com>
Date:	Wed, 22 Jun 2016 11:38:43 -0400
From:	Joseph Salisbury <joseph.salisbury@...onical.com>
To:	rtatiya@...eaurora.org
Cc:	Greg KH <gregkh@...uxfoundation.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: [v4.2-rc1 Regression] usb: Enable LPM for USB 2.01+ full-speed
 devices

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?

Thanks,

Joe

[0] http://pad.lv/1498667