linux-kernel - Re: Linux v5.5 serious PCI bug

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Date:   Tue, 10 Dec 2019 14:34:08 +0200
From:   "mika.westerberg@...ux.intel.com" <mika.westerberg@...ux.intel.com>
To:     Nicholas Johnson <nicholas.johnson-opensource@...look.com.au>
Cc:     Bjorn Helgaas <helgaas@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>
Subject: Re: Linux v5.5 serious PCI bug

On Tue, Dec 10, 2019 at 12:00:23PM +0000, Nicholas Johnson wrote:
> The following is the culprit responsible for the issues:
> 
> commit 586bc4aab878efcf672536f0cdec3d04b6990c94
> Author: Alex Deucher <alexander.deucher@....com>
> Date:   Fri Nov 22 16:43:50 2019 -0500
> 
>     ALSA: hda/hdmi - fix vgaswitcheroo detection for AMD
>
> It is playing with PCI devices. Clearly they did not consider 
> hot-removal. I am guessing it is seeing the audio PCI func of the AMD 
> card in that Thunderbolt eGPU enclosure.
>
> I will collect information, make a bugzilla report and contact the AMD 
> team. If anybody wants to be cc'd in then let me know. Sorry for 
> bothering you and Bjorn with something which actually has nothing 
> directly to do with the PCI subsystem or Thunderbolt.

No problem. Thanks for taking time to bisect the issue.