Re: [PATCH] USB: storage: UAS: ignore UAS on Realtek RTL9210B with firmware f0.01

[Greg KH <gregkh@linuxfoundation.org>]

On Sun, Mar 08, 2026 at 08:37:28PM +0100, Nils Reuter wrote:
> Hi Greg,
> 
> Thanks for the feedback. As requested, here is the patch to add the UAS
> quirk for the Realtek RTL9210B (bcdDevice f0.01).
> 
> Regards,
> Nils
> 
> ---
> 
> From cb1f8118e802be51a06f4564bb01f91110a51b53 Mon Sep 17 00:00:00 2001
> From: Nils Reuter <nils.reuter@gmx.net>
> Date: Sun, 8 Mar 2026 19:39:21 +0100
> Subject: [PATCH] USB: storage: UAS: ignore UAS on Realtek RTL9210B with
>  firmware f0.01
> 
> The Realtek RTL9210B (0bda:9210) with firmware version f0.01 suffers
> from UAS protocol hangs under heavy I/O load, leading to device
> resets and read-only remounts. Disabling UAS via the IGNORE_UAS
> quirk stabilizes the connection.
> 
> Signed-off-by: Nils Reuter <nils.reuter@gmx.net>
> ---
>  drivers/usb/storage/unusual_uas.h | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/drivers/usb/storage/unusual_uas.h b/drivers/usb/storage/unusual_uas.h
> index 939a98c2d..f17469f8c 100644
> --- a/drivers/usb/storage/unusual_uas.h
> +++ b/drivers/usb/storage/unusual_uas.h
> @@ -90,6 +90,13 @@ UNUSUAL_DEV(0x0bc2, 0x331a, 0x0000, 0x9999,
>  		USB_SC_DEVICE, USB_PR_DEVICE, NULL,
>  		US_FL_NO_REPORT_LUNS),
>  
> +/* Reported-by: Nils Reuter <nils.reuter@gmx.net> */
> +UNUSUAL_DEV(0x0bda, 0x9210, 0xf001, 0xf001,
> +		"Realtek",
> +		"RTL9210B",
> +		USB_SC_DEVICE, USB_PR_DEVICE, NULL,
> +		US_FL_IGNORE_UAS),

This is a VERY heavy hammer for this type of device.  You say that the
device just starts to time out, which implies it overheats or something
else?  Are you sure that slowing it down like this is the best overall
solution?  What does other operating systems do for this device?

thanks,

greg k-h