[FS#4144] Raspberry Pi Zero W | wifi adhoc not working with HT20 mode

[OpenWrt Bugs]

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A new Flyspray task has been opened.  Details are below. 

User who did this - Bastian Bittorf (bittorf) 

Attached to Project - OpenWrt/LEDE Project
Summary - Raspberry Pi Zero W | wifi adhoc not working with HT20 mode
Task Type - Bug Report
Category - Base system
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Low
Priority - Very Low
Reported Version - Trunk
Due in Version - Undecided
Due Date - Undecided
Details - Just for documenting the issue for others:

tested with r18155 (2021-nov-21) the wifi interface
does not come up in adhoc mode when HT20 is enabled.

uci set wireless.radio0.htmode=HT20
wifi
=> not working

uci del wireless.radio0.htmode
wifi
=> OK/working

The relevent log collected with /lib/netifd/wireless/mac80211.sh
is here, it fails at the last 'iw' call:


rc:244 | iw dev wlan0 del
command failed: No error information (-524)
rc:0 | iw phy0 info
rc:0 | iw reg get
rc:0 | iw reg set US
rc:161 | iw phy phy0 set antenna 0xffffffff 0xffffffff
command failed: Not supported (-95)
rc:161 | iw phy phy0 set antenna_gain 0
command failed: Not supported (-95)
rc:251 | iw phy phy0 set distance 0
command failed: I/O error (-5)
rc:251 | iw phy phy0 set txpower fixed 2300
command failed: I/O error (-5)
rc:233 | iw phy phy0 interface add wlan0 type adhoc
command failed: Too many open files in system (-23)
rc:233 | iw phy phy0 interface add wlan0 type adhoc
command failed: Too many open files in system (-23)
rc:0 | iw dev wlan0 info
rc:244 | iw dev wlan0 del
command failed: No error information (-524)
rc:0 | iw dev wlan0 set type ibss
rc:234 | iw dev wlan0 ibss join ffintern.2GHz 2432 HT20 fixed-freq 02:ca:ff:ee:ba:be beacon-interval 250 mcast-rate 6
command failed: Invalid argument (-22)


without HT20 mode enabled:

[...]
rc:0 | iw dev wlan0 set type ibss
rc:0 | iw dev wlan0 ibss join ffintern.2GHz 2432 fixed-freq 02:ca:ff:ee:ba:be beacon-interval 250 mcast-rate 6


removing mcast-rate or beacon-interval does not change the behavior.


More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=4144

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