linux-kernel - Re: [PATCH] USB: storage: Ignore driver CD mode for Realtek multi-mode Wi-Fi dongles

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Message-ID: <A54117AB-2BFD-4864-AEA3-4F1AF977A869@gmail.com>
Date: Wed, 13 Aug 2025 22:13:18 +0400
From: Giorgi <giorgitchankvetadze1997@...il.com>
To: Zenm Chen <zenmchen@...il.com>, stern@...land.harvard.edu
CC: gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
 linux-usb@...r.kernel.org, pkshih@...ltek.com, rtl8821cerfe2@...il.com,
 stable@...r.kernel.org, usb-storage@...ts.one-eyed-alien.net,
 usbwifi2024@...il.com, zenmchen@...il.com
Subject: Re: [PATCH] USB: storage: Ignore driver CD mode for Realtek multi-mode Wi-Fi dongles

Maybe we could only add US_FL_IGNORE_DEVICE for the exact Realtek-based models (Mercury MW310UH, D-Link AX9U, etc.) that fail with usb_modeswitch.

This avoids disabling access to the emulated CD for unrelated devices.


>On August 13, 2025 9:53:12 PM GMT+04:00, Zenm Chen <zenmchen@...il.com> wrote:
>>Alan Stern <stern@...land.harvard.edu> 於 2025年8月14日 週四 上午12:58寫道：
>>>
>>> On Thu, Aug 14, 2025 at 12:24:15AM +0800, Zenm Chen wrote:
>>> > Many Realtek USB Wi-Fi dongles released in recent years have two modes:
>>> > one is driver CD mode which has Windows driver onboard, another one is
>>> > Wi-Fi mode. Add the US_FL_IGNORE_DEVICE quirk for these multi-mode devices.
>>> > Otherwise, usb_modeswitch may fail to switch them to Wi-Fi mode.
>>>
>>> There are several other entries like this already in the unusual_devs.h
>>> file.  But I wonder if we really still need them.  Shouldn't the
>>> usb_modeswitch program be smart enough by now to know how to handle
>>> these things?
>>
>>Hi Alan,
>>
>>Thanks for your review and reply.
>>
>>Without this patch applied, usb_modeswitch cannot switch my Mercury MW310UH
>>into Wi-Fi mode [1]. I also ran into a similar problem like [2] with D-Link
>>AX9U, so I believe this patch is needed.
>>
>>>
>>> In theory, someone might want to access the Windows driver on the
>>> emulated CD.  With this quirk, they wouldn't be able to.
>>>
>>
>>Actually an emulated CD doesn't appear when I insert these 2 Wi-Fi dongles into
>>my Linux PC, so users cannot access that Windows driver even if this patch is not 
>>applied.
>>
>>> Alan Stern
>>
>>[1] https://drive.google.com/file/d/1YfWUTxKnvSeu1egMSwcF-memu3Kis8Mg/view?usp=drive_link
>>
>>[2] https://github.com/morrownr/rtw89/issues/10
>>