[PATCH] ath11k: fix warning of not found station for bssid in message

[Kalle Valo]

Wen Gong <quic_wgong at quicinc.com> wrote:

> When test connect/disconnect to an AP frequently with WCN6855, sometimes
> it show below log.
> 
> [  277.040121] wls1: deauthenticating from 8c:21:0a:b3:5a:64 by local choice (Reason: 3=DEAUTH_LEAVING)
> [  277.050906] ath11k_pci 0000:05:00.0: wmi stats vdev id 0 mac 00:03:7f:29:61:11
> [  277.050944] ath11k_pci 0000:05:00.0: wmi stats bssid 8c:21:0a:b3:5a:64 vif         pK-error
> [  277.050954] ath11k_pci 0000:05:00.0: not found station for bssid 8c:21:0a:b3:5a:64
> [  277.050961] ath11k_pci 0000:05:00.0: failed to parse rssi chain -71
> [  277.050967] ath11k_pci 0000:05:00.0: failed to pull fw stats: -71
> [  277.050976] ath11k_pci 0000:05:00.0: wmi stats vdev id 0 mac 00:03:7f:29:61:11
> [  277.050983] ath11k_pci 0000:05:00.0: wmi stats bssid 8c:21:0a:b3:5a:64 vif         pK-error
> [  277.050989] ath11k_pci 0000:05:00.0: not found station for bssid 8c:21:0a:b3:5a:64
> [  277.050995] ath11k_pci 0000:05:00.0: failed to parse rssi chain -71
> [  277.051000] ath11k_pci 0000:05:00.0: failed to pull fw stats: -71
> [  278.064050] ath11k_pci 0000:05:00.0: failed to request fw stats: -110
> 
> Reason is:
> When running disconnect operation, sta_info removed from local->sta_hash
> by __sta_info_destroy_part1() from __sta_info_flush(), after this,
> ieee80211_find_sta_by_ifaddr() which called by
> ath11k_wmi_tlv_fw_stats_data_parse() and ath11k_wmi_tlv_rssi_chain_parse()
> cannot find this station, then failed log printed.
> 
> steps are like this:
> 1. when disconnect from AP, __sta_info_destroy() called __sta_info_destroy_part1()
> and __sta_info_destroy_part2().
> 
> 2. in __sta_info_destroy_part1(),  it has "sta_info_hash_del(local, sta)"
> and "list_del_rcu(&sta->list)", it will remove the ieee80211_sta from the
> list of ieee80211_hw.
> 
> 3. in __sta_info_destroy_part2(), it called drv_sta_state()->ath11k_mac_op_sta_state(),
> then peer->sta is clear at this moment.
> 
> 4. in __sta_info_destroy_part2(), it then called sta_set_sinfo()->drv_sta_statistics()
> ->ath11k_mac_op_sta_statistics(), then WMI_REQUEST_STATS_CMDID sent to firmware.
> 
> 5. WMI_UPDATE_STATS_EVENTID reported from firmware, at this moment, the
> ieee80211_sta can not be found again because it has remove from list in
> step2 and also peer->sta is clear in step3.
> 
> 6. in __sta_info_destroy_part2(), it then called cleanup_single_sta()->
> sta_info_free()->kfree(sta), at this moment, the ieee80211_sta is freed
> in memory, then the failed log will not happen because function
> ath11k_mac_op_sta_state() will not be called.
> 
> Actually this print log is not a real error, it is only to skip parse the
> info, so change to skip print by default debug setting.
> 
> Tested-on: WCN6855 hw2.0 PCI WLAN.HSP.1.1-03125-QCAHSPSWPL_V1_V2_SILICONZ_LITE-3
> 
> Signed-off-by: Wen Gong <quic_wgong at quicinc.com>
> Signed-off-by: Kalle Valo <quic_kvalo at quicinc.com>

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

7330e1ec9748 ath11k: fix warning of not found station for bssid in message

-- 
https://patchwork.kernel.org/project/linux-wireless/patch/20220428022426.2927-1-quic_wgong@quicinc.com/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches