#18686: ar71xx: DFS failure with HT40 / multiple VAPs
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Reporter: avalentin | Owner: developers
Type: defect | Status: new
Priority: normal | Milestone:
Component: kernel | Version: Trunk
Keywords: WLAN DFS HT40 |
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I just tested DFS on trunk with a Buffalo WZR-HP-AG300H. Strange problems
occured. But after fixing the EEPROM all channels (including DFS) are
available (in 5GHz band).
If I start an VAP with HT20, hostapd scans the frequecies and selects a
channel. The following start_dfs_cac is successfull.
If I start an VAP with HT40+-, hostapd also scans and finds a channel.
But the start_dfs_cac fails.
Here a log entry:
wlan1: interface state HT_SCAN->DFS
wlan1: DFS-CAC-START freq=5500 chan=100 sec_chan=1, width=0, seg0=0,
seg1=0, cac_time=60s
DFS start_dfs_cac() failed, -1
Interface initialization failed
wlan1: interface state DFS->DISABLED
wlan1: AP-DISABLED
More debug:
nl80211: Start radar detection (CAC) 5500 MHz (ht_enabled=1,
vht_enabled=0, bandwidth=40 MHz, cf1=5510 MHz, cf2=0 MHz)
nl80211: Failed to start radar detection: -16 (Device or resource busy)
Another problem I found is that if DFS is used, and I want to assign
multiple VAPs, it does not work. Hostapd also breaks with Device or
ressource busy when setting the VAP wlan1-1 up. Using a non DFS channel
resulted in a working hostapd. In this case I couln't get more
information.
BTW, VHT and DFS with an ath10k card works fine.
--
Ticket URL: <https://dev.openwrt.org/ticket/18686>
OpenWrt <http://openwrt.org>
Opensource Wireless Router Technology
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