linux-kernel - Re: [PATCH] usbnet: prevent device rpm suspend in usbnet

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Date:   Thu, 10 Nov 2016 12:09:58 +0100
From:   Bjørn Mork <bjorn@...k.no>
To:     Kai-Heng Feng <kai.heng.feng@...onical.com>
Cc:     Oliver Neukum <oneukum@...e.com>,
        Alan Stern <stern@...land.harvard.edu>,
        linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
        netdev@...r.kernel.org
Subject: Re: [PATCH] usbnet: prevent device rpm suspend in usbnet_probe function

Kai-Heng Feng <kai.heng.feng@...onical.com> writes:
> On Wed, Nov 9, 2016 at 8:32 PM, Bjørn Mork <bjorn@...k.no> wrote:
>> Oliver Neukum <oneukum@...e.com> writes:
>>
>>> On Tue, 2016-11-08 at 13:44 -0500, Alan Stern wrote:
>>>
>>>> These problems could very well be caused by running at SuperSpeed
>>>> (USB-3) instead of high speed (USB-2).
>
> Yes, it's running at SuperSpeed, on a Kabylake laptop.
>
> It does not have this issue on a Broadwell laptop, also running at SuperSpeed.

Then I must join Oliver, being very surprised by where in the stack you
attempt to fix the issue.  What you write above indicates a problem in
pci bridge or usb host controller, doesn't it?


Bjørn