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* [PATCH] USB: storage: Ignore driver CD mode for Realtek multi-mode Wi-Fi dongles
@ 2025-08-13 16:24 Zenm Chen
  2025-08-13 16:58 ` Alan Stern
  0 siblings, 1 reply; 14+ messages in thread
From: Zenm Chen @ 2025-08-13 16:24 UTC (permalink / raw)
  To: stern, gregkh, linux-usb, usb-storage, linux-kernel
  Cc: pkshih, rtl8821cerfe2, usbwifi2024, zenmchen, stable

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.

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=02 Lev=01 Prnt=01 Port=01 Cnt=01 Dev#= 12 Spd=480  MxCh= 0
D:  Ver= 2.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs=  1
P:  Vendor=0bda ProdID=a192 Rev= 2.00
S:  Manufacturer=Realtek
S:  Product=DISK
C:* #Ifs= 1 Cfg#= 1 Atr=80 MxPwr=500mA
I:* If#= 0 Alt= 0 #EPs= 2 Cls=08(stor.) Sub=06 Prot=50 Driver=(none)
E:  Ad=8a(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E:  Ad=0b(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms

Information about D-Link AX9U rev. A1 in /sys/kernel/debug/usb/devices.
T:  Bus=03 Lev=01 Prnt=01 Port=02 Cnt=01 Dev#= 55 Spd=480  MxCh= 0
D:  Ver= 2.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs=  1
P:  Vendor=0bda ProdID=1a2b Rev= 0.00
S:  Manufacturer=Realtek
S:  Product=DISK
C:* #Ifs= 1 Cfg#= 1 Atr=e0 MxPwr=500mA
I:* If#= 0 Alt= 0 #EPs= 2 Cls=08(stor.) Sub=06 Prot=50 Driver=(none)
E:  Ad=84(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E:  Ad=05(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms

Cc: stable@vger.kernel.org # 5.4.x
Signed-off-by: Zenm Chen <zenmchen@gmail.com>
---
 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/unusual_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 ),
 
+/*
+ * Reported by Zenm Chen <zenmchen@gmail.com>
+ * 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 <zenmchen@gmail.com>
+ * 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",
-- 
2.50.1


^ permalink raw reply related	[flat|nested] 14+ messages in thread

end of thread, other threads:[~2025-08-14 17:22 UTC | newest]

Thread overview: 14+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2025-08-13 16:24 [PATCH] USB: storage: Ignore driver CD mode for Realtek multi-mode Wi-Fi dongles Zenm Chen
2025-08-13 16:58 ` Alan Stern
2025-08-13 17:53   ` Zenm Chen
     [not found]     ` <8560A878-1EAE-4FE3-B96E-2916E27F90F5@gmail.com>
2025-08-13 18:13       ` Giorgi
2025-08-13 23:32         ` Zenm Chen
2025-08-13 18:19     ` [usb-storage] " Alan Stern
2025-08-13 22:54       ` Zenm Chen
2025-08-14  1:57         ` Lars Melin
2025-08-14 14:31           ` Zenm Chen
2025-08-14 14:59           ` Zenm Chen
2025-08-14 14:03       ` Zenm Chen
2025-08-14 16:21         ` [usb-storage] " Alan Stern
2025-08-14 17:06           ` Greg KH
2025-08-14 17:22             ` Zenm Chen

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