Wen Gong <quic_wgong@xxxxxxxxxxx> 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@xxxxxxxxxxx> > Signed-off-by: Kalle Valo <quic_kvalo@xxxxxxxxxxx> 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@xxxxxxxxxxx/ https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches
