USB regression in kernel 6.2.2

[Brian Morrison <bdm@fenrir.org.uk>]

[-- Attachment #1: Type: text/plain, Size: 1298 bytes --]

Hello Mathias (sorry you're getting this twice).

Re-send after linux-usb list rejection (too big).

Hans de Goede replied to my Fedora kernel bug here:

https://bugzilla.redhat.com/show_bug.cgi?id=2175534

suggesting that I contact you about it and Cc: the linux-usb list.

Starting with kernel-6.2.2-300 on Fedora x86_64 (the first 6.2 kernel on
Fedora 37) I am seeing problems with USB devices on a Renesas
ROM-based USB PCI card which works normally with kernel-6.1.15-200 and
earlier 6.x kernels, essentially the USB 2.0 device tree on this card's
bus is not being enumerated with the result that my /dev/ttyUSB*
devices are no longer present (these are Silicon Labs CP210x UARTS with
TI PCM290x devices behind them).

I have attached the lsusb -t output for the working and broken cases, I
don't know where the problem lies but I suspect it's not udev because
the configuration is unchanged, it seems to be in the kernel usb code.

There are further attachments in the bug referred to above, I don't
know if they help but you can look there if the lsusb output is
insufficient, I can point out that lsmod does show the cp210x module is
loaded which may provide a clue about where things are failing.

Thanks for reading this, I look forward to hearing your suggestions.

-- 

Brian Morrison


[-- Attachment #2: lsusb_t_6.1.15 --]
[-- Type: application/octet-stream, Size: 2669 bytes --]

/:  Bus 04.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/4p, 5000M
/:  Bus 03.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/4p, 480M
    |__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/4p, 12M
        |__ Port 1: Dev 4, If 0, Class=Vendor Specific Class, Driver=cp210x, 12M
        |__ Port 4: Dev 6, If 0, Class=Audio, Driver=snd-usb-audio, 12M
        |__ Port 4: Dev 6, If 1, Class=Audio, Driver=snd-usb-audio, 12M
        |__ Port 4: Dev 6, If 2, Class=Audio, Driver=snd-usb-audio, 12M
        |__ Port 4: Dev 6, If 3, Class=Human Interface Device, Driver=usbhid, 12M
    |__ Port 2: Dev 3, If 0, Class=Audio, Driver=snd-usb-audio, 12M
    |__ Port 2: Dev 3, If 1, Class=Audio, Driver=snd-usb-audio, 12M
    |__ Port 2: Dev 3, If 2, Class=Human Interface Device, Driver=usbhid, 12M
    |__ Port 3: Dev 5, If 0, Class=Video, Driver=uvcvideo, 480M
    |__ Port 3: Dev 5, If 1, Class=Video, Driver=uvcvideo, 480M
    |__ Port 3: Dev 5, If 2, Class=Audio, Driver=snd-usb-audio, 480M
    |__ Port 3: Dev 5, If 3, Class=Audio, Driver=snd-usb-audio, 480M
    |__ Port 4: Dev 7, If 0, Class=Hub, Driver=hub/4p, 480M
        |__ Port 1: Dev 8, If 0, Class=Vendor Specific Class, Driver=cp210x, 12M
        |__ Port 2: Dev 9, If 0, Class=Vendor Specific Class, Driver=cp210x, 12M
        |__ Port 4: Dev 10, If 0, Class=Audio, Driver=snd-usb-audio, 12M
        |__ Port 4: Dev 10, If 1, Class=Audio, Driver=snd-usb-audio, 12M
        |__ Port 4: Dev 10, If 2, Class=Audio, Driver=snd-usb-audio, 12M
        |__ Port 4: Dev 10, If 3, Class=Human Interface Device, Driver=usbhid, 12M
/:  Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/8p, 10000M
/:  Bus 01.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/16p, 480M
    |__ Port 5: Dev 2, If 0, Class=Audio, Driver=snd-usb-audio, 12M
    |__ Port 5: Dev 2, If 1, Class=Audio, Driver=snd-usb-audio, 12M
    |__ Port 5: Dev 2, If 2, Class=Audio, Driver=snd-usb-audio, 12M
    |__ Port 5: Dev 2, If 3, Class=Human Interface Device, Driver=usbhid, 12M
    |__ Port 6: Dev 3, If 0, Class=Audio, Driver=snd-usb-audio, 480M
    |__ Port 6: Dev 3, If 1, Class=Audio, Driver=snd-usb-audio, 480M
    |__ Port 6: Dev 3, If 2, Class=Human Interface Device, Driver=usbhid, 480M
    |__ Port 9: Dev 4, If 0, Class=Human Interface Device, Driver=usbhid, 1.5M
    |__ Port 10: Dev 5, If 0, Class=Human Interface Device, Driver=usbhid, 1.5M
    |__ Port 10: Dev 5, If 1, Class=Human Interface Device, Driver=usbhid, 1.5M
    |__ Port 12: Dev 6, If 0, Class=Audio, Driver=snd-usb-audio, 12M
    |__ Port 12: Dev 6, If 1, Class=Audio, Driver=snd-usb-audio, 12M
    |__ Port 12: Dev 6, If 2, Class=Human Interface Device, Driver=usbhid, 12M

[-- Attachment #3: lsusb_t_6.2.2 --]
[-- Type: application/octet-stream, Size: 1493 bytes --]

/:  Bus 04.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/4p, 5000M
/:  Bus 03.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/8p, 10000M
/:  Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/4p, 480M
    |__ Port 3: Dev 5, If 0, Class=Video, Driver=uvcvideo, 480M
    |__ Port 3: Dev 5, If 1, Class=Video, Driver=uvcvideo, 480M
    |__ Port 3: Dev 5, If 2, Class=Audio, Driver=snd-usb-audio, 480M
    |__ Port 3: Dev 5, If 3, Class=Audio, Driver=snd-usb-audio, 480M
/:  Bus 01.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/16p, 480M
    |__ Port 5: Dev 2, If 0, Class=Audio, Driver=snd-usb-audio, 12M
    |__ Port 5: Dev 2, If 1, Class=Audio, Driver=snd-usb-audio, 12M
    |__ Port 5: Dev 2, If 2, Class=Audio, Driver=snd-usb-audio, 12M
    |__ Port 5: Dev 2, If 3, Class=Human Interface Device, Driver=usbhid, 12M
    |__ Port 6: Dev 3, If 0, Class=Audio, Driver=snd-usb-audio, 480M
    |__ Port 6: Dev 3, If 1, Class=Audio, Driver=snd-usb-audio, 480M
    |__ Port 6: Dev 3, If 2, Class=Human Interface Device, Driver=usbhid, 480M
    |__ Port 9: Dev 4, If 0, Class=Human Interface Device, Driver=usbhid, 1.5M
    |__ Port 10: Dev 5, If 0, Class=Human Interface Device, Driver=usbhid, 1.5M
    |__ Port 10: Dev 5, If 1, Class=Human Interface Device, Driver=usbhid, 1.5M
    |__ Port 12: Dev 6, If 0, Class=Audio, Driver=snd-usb-audio, 12M
    |__ Port 12: Dev 6, If 1, Class=Audio, Driver=snd-usb-audio, 12M
    |__ Port 12: Dev 6, If 2, Class=Human Interface Device, Driver=usbhid, 12M