[Bug 216588] New: RTL9210(B) falsely detected as rotational disk

[Bug 216588] New: RTL9210(B) falsely detected as rotational disk

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=216588

            Bug ID: 216588
           Summary: RTL9210(B) falsely detected as rotational disk
           Product: Drivers
           Version: 2.5
    Kernel Version: 6.0.1
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: USB
          Assignee: drivers_usb@kernel-bugs.kernel.org
          Reporter: supgesu@gmail.com
        Regression: No

Hi, using an Realtek RTL9210B in an NVME M.2 to USB enclosure, the kernel does
not detect that it is a non rotational disk.

`/sys/block/sdX/queue/rotational` is set to `1`, which is false, since this is
no and can never be an HDD (adapter is for SSDs only).

On another adapter with JMS583 chipset it already works and correctly detects
queue/rotational -> 0.
Only on the Realtek one it is wrong.

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[Bug 216588] RTL9210(B) falsely detected as rotational disk

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=216588

--- Comment #1 from Alan Stern (stern@rowland.harvard.edu) ---
This bug should be assigned to the SCSI or block subsystem, not the USB
subsystem.  USB is not responsible for determining whether a disk drive is
rotational.  All it does is transfer commands from those higher layers to the
drive and transfer the results from the drive back to the higher layers.

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[Bug 216588] RTL9210(B) falsely detected as rotational disk

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=216588

Elias (supgesu@gmail.com) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|USB                         |SCSI
            Product|Drivers                     |IO/Storage

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[Bug 216588] RTL9210(B) falsely detected as rotational disk

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=216588

--- Comment #2 from Elias (supgesu@gmail.com) ---
Thanks Alan for the hint, I changed it. But unfortunately I can't change the
Assignee, which is still on drivers_usb.

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[Bug 216588] RTL9210(B) falsely detected as rotational disk

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=216588

Martin K. Petersen (mkp@mkp.net) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |mkp@mkp.net

--- Comment #3 from Martin K. Petersen (mkp@mkp.net) ---
I propose you create a udev rule to override what the device firmware
erroneously reports.

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[Bug 216588] RTL9210(B) falsely detected as rotational disk

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=216588

--- Comment #4 from Elias (supgesu@gmail.com) ---
(In reply to Martin K. Petersen from comment #3)
> I propose you create a udev rule to override what the device firmware
> erroneously reports.

The whole point of such an adapter is to make the disk portable, which makes it
possible to quickly connect it to many different machines (where some aren't
mine).

Creating a udev rule on every new machine is:
1.) annoying
2.) not possible since I don't always have root access

This is only a workaround limited to own personal machines. But it would be
much more useful if it was auto detected ootb correctly, hence this bug report.

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