[Bug 220193] New: PATCH 6.1 082/167 which adds support for Owon HDS200 breaks functionality of Owon VDS1022

[Bug 220193] New: PATCH 6.1 082/167 which adds support for Owon HDS200 breaks functionality of Owon VDS1022

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=220193

            Bug ID: 220193
           Summary: PATCH 6.1 082/167 which adds support for Owon HDS200
                    breaks functionality of Owon VDS1022
           Product: Drivers
           Version: 2.5
    Kernel Version: 6.1-stable
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: high
          Priority: P3
         Component: USB
          Assignee: drivers_usb@kernel-bugs.kernel.org
          Reporter: lestoppe@gmail.com
                CC: gregkh@linuxfoundation.org
        Regression: Yes
           Bisected 4cc01410e1c1dd075df10f750775c81d1cb6672b
         commit-id:

The commit mentioned added support for the Owon HDS200 into the
usb-simple-serial kernel driver. Since all the Owon test equipment uses the
same VID and PID, my Owon VDS1022 stopped working in kernels that have this
patch.

Currently I've blacklisted usb_simple_serial kernel module as a temporary
workaround. Could you help with a proper fix?

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[Bug 220193] PATCH 6.1 082/167 which adds support for Owon HDS200 breaks functionality of Owon VDS1022

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=220193

Wei Huang (huangwei@kylinos.cn) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |huangwei@kylinos.cn

--- Comment #1 from Wei Huang (huangwei@kylinos.cn) ---
Hi leStoppe,

Thanks for reporting this and bisecting the regression to commit
4cc01410e1c1.

A fix has been submitted to the linux-usb mailing list. It narrows
the OWON match from USB_DEVICE() to USB_DEVICE_AND_INTERFACE_INFO(),
requiring bInterfaceClass=0x05 (Physical Interface Device) as
reported in the HDS200 USB descriptor. This should let the VDS1022
fall back to the generic usbserial driver as before, provided it
uses a different interface class.

The patch can be found here:
https://lore.kernel.org/linux-usb/20260810091322.2201740-1-huangwei@kylinos.cn/

Could you test whether this resolves the issue on your VDS1022?
If the VDS1022 also happens to use bInterfaceClass=0x05, further
work (e.g. a probe callback checking the device string descriptor)
may be needed.

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[Bug 220193] PATCH 6.1 082/167 which adds support for Owon HDS200 breaks functionality of Owon VDS1022

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=220193

--- Comment #2 from leStoppe (lestoppe@gmail.com) ---
Hi Wei Huang,

The patch resolves the issue. I tested it on the latest kernel (6.1.176) in
Debian Bookworm. Just giving the version as a reference, the fix most certainly
will work on any Kernel version that uses this driver.

Validation steps followed:

1. Test on un-patched kernel (Observed the issue as expected)
2. Rebuild the Kernel with the patch (The issues goes away. The VDS1022I
connects properly without any intervetion)

Thank you so much for this fix!

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