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

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Date:   Thu, 10 Nov 2016 12:22:37 +0100
From:   Oliver Neukum <oneukum@...e.com>
To:     Bjørn Mork <bjorn@...k.no>
Cc:     Kai-Heng Feng <kai.heng.feng@...onical.com>,
        Alan Stern <stern@...land.harvard.edu>,
        linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
        netdev@...r.kernel.org,
        Mathias Nyman <mathias.nyman@...ux.intel.com>
Subject: Re: [PATCH] usbnet: prevent device rpm suspend in usbnet_probe
 function

On Thu, 2016-11-10 at 12:09 +0100, Bjørn Mork wrote:
> 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?

Indeed. And this means we need an XHCI specialist.
Mathias, we have a failure specific to one implementation of XHCI.

	Regards
		Oliver