ath10k: Fix fetching channel during potential radar detection

[Kalle Valo]

Mohammed Shafi Shajakhan <mohammed at qti.qualcomm.com> wrote:
> From: Mohammed Shafi Shajakhan <mohammed at qti.qualcomm.com>
> 
> Fetch target operating channel during potential radar detection when
> the interface is just brought up, but no channel is assigned from
> userspace. In this scenario rx_channel may not be having a valid pointer
> hence fetch the target operating channel to avoid warnings as below
> which can be triggered by the commands with DFS testing over longer run
> 
> comamnds:
> iw wlan1 set type mesh
> ifconfig wlan1 up (valid tgt_oper_chan only)
> iw wlan1 cac trigger freq 5260 HT20 (valid rx_channel, tgt_oper_chan)
> iw wlan1 cac trigger freq 5280 HT20
> iw wlan1 cac trigger freq 5300 HT20
> 
> Once the CAC expires, current channel context will be removed and
> we are only left with the fallback option of using 'target operating
> channel'
> 
> Firmware and driver log:
> ath: phy1: DFS: radar found on freq=5300: id=1, pri=1125, count=5,
> count_false=4
> ath: phy1: DFS: radar found on freq=5260: id=5, pri=3151, count=6,
> count_false=11
> ath: phy1: DFS: radar found on freq=5280: id=1, pri=1351, count=6,
> count_false=4
> ath: phy1: DFS: radar found on freq=5300: id=1, pri=1125, count=5,
> count_false=4
> ath10k_pci 0001:01:00.0: failed to derive channel for radar pulse,
> treating as radar
> ath10k_pci 0001:01:00.0: failed to derive channel for radar pulse,
> treating as radar
> 
> Call trace:
> 
> WARNING: CPU: 1 PID: 2145 at
> backports-20161201-3.14.77-9ab3068/net/wireless/chan.c:265
> cfg80211_set_dfs_state+0x3c/0x88 [cfg80211]()
> 
>  Workqueue: phy1 ieee80211_dfs_radar_detected_work
> [mac80211]
> [<c0320770>] (warn_slowpath_null) from [<bf79b90c>]
> (cfg80211_set_dfs_state+0x3c/0x88 [cfg80211])
> [<bf79b90c>] (cfg80211_set_dfs_state [cfg80211]) from
> [<bf79697c>] (cfg80211_radar_event+0xc4/0x140 [cfg80211])
> [<bf79697c>] (cfg80211_radar_event [cfg80211]) from
> [<bf83c058>] (ieee80211_dfs_radar_detected_work+0xa8/0xb4 [mac80211])
> [<bf83c058>] (ieee80211_dfs_radar_detected_work
> [mac80211]) from [<c0339518>] (process_one_work+0x298/0x4a4)
> 
> Signed-off-by: Mohammed Shafi Shajakhan <mohammed at qti.qualcomm.com>

Patch applied to ath-next branch of ath.git, thanks.

a28f6f27a88f ath10k: fix fetching channel during potential radar detection

-- 
https://patchwork.kernel.org/patch/9610979/

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