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[118.232.8.190]) by smtp.googlemail.com with ESMTPSA id 98e67ed59e1d1-3232576410csm727158a91.11.2025.08.13.10.53.15 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 13 Aug 2025 10:53:17 -0700 (PDT) From: Zenm Chen To: stern@rowland.harvard.edu Cc: gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, pkshih@realtek.com, rtl8821cerfe2@gmail.com, stable@vger.kernel.org, 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 01:53:12 +0800 Message-ID: <20250813175313.2585-1-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 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