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[118.232.8.190]) by smtp.googlemail.com with ESMTPSA id d9443c01a7336-241d1f0e945sm335665145ad.56.2025.08.13.16.32.16 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 13 Aug 2025 16:32:18 -0700 (PDT) From: Zenm Chen To: giorgitchankvetadze1997@gmail.com Cc: gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, pkshih@realtek.com, rtl8821cerfe2@gmail.com, stable@vger.kernel.org, stern@rowland.harvard.edu, usb-storage@lists.one-eyed-alien.net, usbwifi2024@gmail.com, zenmchen@gmail.com Subject: Re: [PATCH] USB: storage: Ignore driver CD mode for Realtek multi-mode Wi-Fi dongles Date: Thu, 14 Aug 2025 07:32:13 +0800 Message-ID: <20250813233214.5069-1-zenmchen@gmail.com> X-Mailer: git-send-email 2.50.1 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Giorgi 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 wrote: >> >> Alan Stern 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 >>