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References: <s5hy33siofw.wl-tiwai@suse.de> <20190429195459.GU2583@lahna.fi.intel.com>
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From:   Bjorn Helgaas <bhelgaas@google.com>
Date:   Mon, 29 Apr 2019 15:09:43 -0500
Message-ID: <CAErSpo4awEXF3evh7=ZGi39y1dpMx9bdhXw8zt7s+1sDaH6nng@mail.gmail.com>
Subject: Re: [REGRESSION 5.0.8] Dell thunderbolt dock broken (xhci_hcd and thunderbolt)
To:     Mika Westerberg <mika.westerberg@linux.intel.com>
Cc:     Takashi Iwai <tiwai@suse.de>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Lukas Wunner <lukas@wunner.de>, Jiri Slaby <jslaby@suse.cz>,
        Michael Hirmke <opensuse@mike.franken.de>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Linux PCI <linux-pci@vger.kernel.org>
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On Mon, Apr 29, 2019 at 2:55 PM Mika Westerberg
<mika.westerberg@linux.intel.com> wrote:
>
> On Mon, Apr 29, 2019 at 09:47:15PM +0200, Takashi Iwai wrote:
> > Hi,
>
> Hi,
>
> > we've got a regression report wrt xhci_hcd and thunderbolt on a Dell
> > machine.  5.0.7 is confirmed to work, so it must be a regression
> > introduced by 5.0.8.
> >
> > The details are found in openSUSE Bugzilla entry:
> >   https://bugzilla.opensuse.org/show_bug.cgi?id=1132943
> >
> > The probe of xhci_hcd on the dock fails like:
> > [    6.269062] pcieport 0000:3a:00.0: enabling device (0006 -> 0007)
> > [    6.270027] pcieport 0000:3b:03.0: enabling device (0006 -> 0007)
> > [    6.270758] xhci_hcd 0000:3c:00.0: init 0000:3c:00.0 fail, -16
> > [    6.270764] xhci_hcd: probe of 0000:3c:00.0 failed with error -16
> > [    6.271002] xhci_hcd 0000:3d:00.0: init 0000:3d:00.0 fail, -16
> >
> > and later on, thunderbolt gives warnings:
> > [   30.232676] thunderbolt 0000:05:00.0: unexpected hop count: 1023
> > [   30.232957] ------------[ cut here ]------------
> > [   30.232958] thunderbolt 0000:05:00.0: interrupt for TX ring 0 is already enabled
> > [   30.232974] WARNING: CPU: 3 PID: 1009 at drivers/thunderbolt/nhi.c:107 ring_interrupt_active+0x1ea/0x230 [thunderbolt]
> >
> >
> > I blindly suspected the commit 3943af9d01e9 and asked for a reverted
> > kernel, but in vain.  And now it was confirmed that the problem is
> > present with the latest 5.1-rc, too.
> >
> > I put some people who might have interest and the reporter (Michael)
> > to Cc.  If anyone has an idea, feel free to join to the Bugzilla, or
> > let me know if any help needed from the distro side.
>
> Since it exists in 5.1-rcX also it would be good if someone
> who see the problem (Michael?) could bisect it.