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

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Message-ID: <20250813233214.5069-1-zenmchen@gmail.com>
Date: Thu, 14 Aug 2025 07:32:13 +0800
From: Zenm Chen <zenmchen@...il.com>
To: giorgitchankvetadze1997@...il.com
Cc: gregkh@...uxfoundation.org,
	linux-kernel@...r.kernel.org,
	linux-usb@...r.kernel.org,
	pkshih@...ltek.com,
	rtl8821cerfe2@...il.com,
	stable@...r.kernel.org,
	stern@...land.harvard.edu,
	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

Giorgi <giorgitchankvetadze1997@...il.com> 於 2025年8月14日 週四 上午2:07寫道：
>
> 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.

All the Realtek multi-mode Wi-Fi dongles share these two ID (0bda:1a2b and 0bda:a192), so I don't know how to achieve this. 

>
>
> 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
>>