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[118.232.8.190]) by smtp.googlemail.com with ESMTPSA id 98e67ed59e1d1-3232579dfbesm558412a91.20.2025.08.13.09.24.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 13 Aug 2025 09:24:29 -0700 (PDT) From: Zenm Chen To: stern@rowland.harvard.edu, gregkh@linuxfoundation.org, linux-usb@vger.kernel.org, usb-storage@lists.one-eyed-alien.net, linux-kernel@vger.kernel.org Cc: pkshih@realtek.com, rtl8821cerfe2@gmail.com, usbwifi2024@gmail.com, zenmchen@gmail.com, stable@vger.kernel.org Subject: [PATCH] USB: storage: Ignore driver CD mode for Realtek multi-mode Wi-Fi dongles Date: Thu, 14 Aug 2025 00:24:15 +0800 Message-ID: <20250813162415.2630-1-zenmchen@gmail.com> X-Mailer: git-send-email 2.50.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Many Realtek USB Wi-Fi dongles released in recent years have two modes:=20 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. Currently there are only two USB IDs known to be used by these multi-mode Wi-Fi dongles: 0bda:1a2b and 0bda:a192. Information about Mercury MW310UH in /sys/kernel/debug/usb/devices. T: Bus=3D02 Lev=3D01 Prnt=3D01 Port=3D01 Cnt=3D01 Dev#=3D 12 Spd=3D480 Mx= Ch=3D 0 D: Ver=3D 2.00 Cls=3D00(>ifc ) Sub=3D00 Prot=3D00 MxPS=3D64 #Cfgs=3D 1 P: Vendor=3D0bda ProdID=3Da192 Rev=3D 2.00 S: Manufacturer=3DRealtek S: Product=3DDISK C:* #Ifs=3D 1 Cfg#=3D 1 Atr=3D80 MxPwr=3D500mA I:* If#=3D 0 Alt=3D 0 #EPs=3D 2 Cls=3D08(stor.) Sub=3D06 Prot=3D50 Driver= =3D(none) E: Ad=3D8a(I) Atr=3D02(Bulk) MxPS=3D 512 Ivl=3D0ms E: Ad=3D0b(O) Atr=3D02(Bulk) MxPS=3D 512 Ivl=3D0ms Information about D-Link AX9U rev. A1 in /sys/kernel/debug/usb/devices. T: Bus=3D03 Lev=3D01 Prnt=3D01 Port=3D02 Cnt=3D01 Dev#=3D 55 Spd=3D480 Mx= Ch=3D 0 D: Ver=3D 2.00 Cls=3D00(>ifc ) Sub=3D00 Prot=3D00 MxPS=3D64 #Cfgs=3D 1 P: Vendor=3D0bda ProdID=3D1a2b Rev=3D 0.00 S: Manufacturer=3DRealtek S: Product=3DDISK C:* #Ifs=3D 1 Cfg#=3D 1 Atr=3De0 MxPwr=3D500mA I:* If#=3D 0 Alt=3D 0 #EPs=3D 2 Cls=3D08(stor.) Sub=3D06 Prot=3D50 Driver= =3D(none) E: Ad=3D84(I) Atr=3D02(Bulk) MxPS=3D 512 Ivl=3D0ms E: Ad=3D05(O) Atr=3D02(Bulk) MxPS=3D 512 Ivl=3D0ms Cc: stable@vger.kernel.org # 5.4.x Signed-off-by: Zenm Chen Acked-by: Alan Stern --- drivers/usb/storage/unusual_devs.h | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) diff --git a/drivers/usb/storage/unusual_devs.h b/drivers/usb/storage/unusu= al_devs.h index 54f0b1c83..5a6577a57 100644 --- a/drivers/usb/storage/unusual_devs.h +++ b/drivers/usb/storage/unusual_devs.h @@ -1494,6 +1494,28 @@ UNUSUAL_DEV( 0x0bc2, 0x3332, 0x0000, 0x9999, USB_SC_DEVICE, USB_PR_DEVICE, NULL, US_FL_NO_WP_DETECT ), =20 +/* + * Reported by Zenm Chen + * Ignore driver CD mode, otherwise usb_modeswitch may fail to switch + * the device into Wi-Fi mode. + */ +UNUSUAL_DEV( 0x0bda, 0x1a2b, 0x0000, 0xffff, + "Realtek", + "DISK", + USB_SC_DEVICE, USB_PR_DEVICE, NULL, + US_FL_IGNORE_DEVICE ), + +/* + * Reported by Zenm Chen + * Ignore driver CD mode, otherwise usb_modeswitch may fail to switch + * the device into Wi-Fi mode. + */ +UNUSUAL_DEV( 0x0bda, 0xa192, 0x0000, 0xffff, + "Realtek", + "DISK", + USB_SC_DEVICE, USB_PR_DEVICE, NULL, + US_FL_IGNORE_DEVICE ), + UNUSUAL_DEV( 0x0d49, 0x7310, 0x0000, 0x9999, "Maxtor", "USB to SATA", --=20 2.50.1