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Message-ID: <83fd1171-5397-40ea-b9e3-54cba073c09a@rowland.harvard.edu>
Date: Tue, 25 Jun 2024 09:36:59 -0400
From: Alan Stern <stern@...land.harvard.edu>
To: tuhaowen <tuhaowen@...ontech.com>
Cc: gregkh@...uxfoundation.org, linux-usb@...r.kernel.org,
usb-storage@...ts.one-eyed-alien.net, linux-kernel@...r.kernel.org,
wangyuli@...ontech.com
Subject: Re: [PATCH] drv/usb: Fix the issue with Realtek USB wireless adapter
AC650
On Tue, Jun 25, 2024 at 03:07:24PM +0800, tuhaowen wrote:
> Due to the dual-mode functionality of the Realtek USB wireless
> adapter AC650, it initially presents itself as a flash drive
> before the driver is installed.
Does this flash-drive mode have a real purpose? For instance, can
people upload new firmware by writing it to the flash drive? I can't
imagine that the manufacturer would have implemented the dual-mode
functionality for no reason at all.
> In Linux, multi-state devices are recognized as storage devices
> on startup because the driver has not yet been loaded.
>
> As a result, the AC650 is identified as a DISK device at boot,
> preventing the use of its WLAN mode. The issue can only be
> resolved by unplugging and replugging the adapter.
If there's no way to resolve this issue other than by unplugging and
replugging the adapter, how can a patch help?
Are you sure that the problem can't be solved by a userspace helper,
such as the usbmodeswitch program?
Alan Stern
> Signed-off-by: tuhaowen <tuhaowen@...ontech.com>
> ---
> drivers/usb/storage/unusual_devs.h | 6 ++++++
> 1 file changed, 6 insertions(+)
>
> diff --git a/drivers/usb/storage/unusual_devs.h b/drivers/usb/storage/unusual_devs.h
> index fd68204374f2..f660d3e52436 100644
> --- a/drivers/usb/storage/unusual_devs.h
> +++ b/drivers/usb/storage/unusual_devs.h
> @@ -1487,6 +1487,12 @@ UNUSUAL_DEV( 0x0bc2, 0x3332, 0x0000, 0x9999,
> USB_SC_DEVICE, USB_PR_DEVICE, NULL,
> US_FL_NO_WP_DETECT ),
>
> +UNUSUAL_DEV(0x0bda, 0x1a2b, 0x0000, 0x9999,
> + "Realtek",
> + "USB Network Device",
> + USB_SC_DEVICE, USB_PR_DEVICE, NULL,
> + US_FL_IGNORE_DEVICE),
> +
> UNUSUAL_DEV( 0x0d49, 0x7310, 0x0000, 0x9999,
> "Maxtor",
> "USB to SATA",
> --
> 2.20.1
>
>
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