Re: [PATCH 0/4] Don't make noise about disconnected USB4 devices

["Michał Pecio" <michal.pecio@gmail.com>]

Hi,

General remarks:
- broken threading on 1/2 and 2/2
- some Cc missing on individual patch emails

On Sun,  8 Jun 2025 20:58:00 -0500, Mario Limonciello wrote:
> When a USB4 or TBT3 dock is disconnected a lot of warnings and errors
> are emitted related to the PCIe tunnels and XHCI controllers in th
> dock.

These patches will probably also trigger on any loss of PCIe link for
any reason: badly seated card, worn connector, EMI, etc.

Will there be any remaining message about dead PCIe links, or just
a silent disappearence? Like dev_info("USB disconnect ...") in USB.

> The messages are loud, but it's mostly because the functions that
> emit the messages don't check whether the device is actually alive.
> The PCIe hotplug services mark the device as perm dead, so that
> can be used to hide some of the messsages.
> 
> In the XHCI driver the device is marked as dying already, so that
> can also be used to hide messages.

Are PCI drivers expected to stay silent on sudden removal mid operation?
Is there no "safe ejection" procedure for those Thunderbolt devices?

> Mario Limonciello (4):
>   PCI: Don't show errors on inaccessible PCI devices
>   PCI: Fix runtime PM usage count underflow
>   usb: xhci: Avoid showing errors during surprise removal
>   usb: xhci: Avoid showing warnings for dying controller

Regards,
Michal