linux-kernel - [RFC] staging: wlan-ng: Driver broken since kernel 5.15

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Date: Sat, 9 Mar 2024 23:09:24 +0100
From: Philipp Hortmann <philipp.g.hortmann@...il.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
 linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org
Cc: Larry.Finger@...inger.net, johannes@...solutions.net, kvalo@...nel.org,
 arnd@...db.de
Subject: [RFC] staging: wlan-ng: Driver broken since kernel 5.15

Hi,

I would remove the driver from the mainline kernel. What are your thoughts?

I bought two WLAN devices (DUT: D-Link DWL-122 and T-Sinus 111 data) 
that are supported by wlan-ng driver. Issue is that the driver is not 
working anymore.

The error picture is that the device does not receive any packets.
The dmesg says:
[  123.695917] prism2_usb 2-1.6:1.0 wlan0: Unknown mgmt request message 
0x0e4f9800
[  127.508211] prism2_usb 2-1.6:1.0 wlan0: Unknown mgmt request message 
0x04f0d000
..

A working commit 8fc4fb1728855a22f9149079ba51877f5ee61fc9 (HEAD) Date: 
Mon Jul 5 11:16:28 2021 -0700
A failing commit  d980cc0620ae77ab2572235a1300bf22519f2e86 (HEAD) Date: 
  Fri Jul 16 19:08:09 2021 -0700

This means that the devices are unusable since kernel 5.15.

A look into the bitrates shows that only up to 11MBits are supported.
static const struct ieee80211_rate prism2_rates[] = {
..
	{ .bitrate = 110 }
};

Would be interesting to see why this happened. But it is difficult for 
me to find it.

Thanks for your support.

Bye Philipp