ath11k: reset 11d state in process of recovery

When doing simulate_fw_crash operation periodically with a short interval
time such as 10 seconds, it is easy happened WMI command timed out for
WMI_SCAN_CHAN_LIST_CMDID in ath11k_reg_update_chan_list().

log:
[42287.610053] ath11k_pci 0000:01:00.0: wmi command 12291 timeout
[42287.610064] ath11k_pci 0000:01:00.0: failed to send WMI_SCAN_CHAN_LIST cmd
[42287.610073] ath11k_pci 0000:01:00.0: failed to perform regd update : -11

Note that this issue does not occur with a longer interval such as 20 seconds.

The reason the issue occurs with a shorter interval is the following steps:
1) Upon initial boot, or after device recovery, the initial hw scan plus
the 11d scan will run, and when 6 GHz support is present, these scans
can take up to 12 seconds to complete, so ath11k_reg_update_chan_list()
is still waiting the completion of ar->completed_11d_scan.
2) If a simulate_fw_crash operation is received during this time, those
scans do not complete, and ath11k_core_pre_reconfigure_recovery()
complete the ar->completed_11d_scan, then ath11k_reg_update_chan_list()
wakeup and start to send WMI_SCAN_CHAN_LIST_CMDID, but firmware is crashed
at this moment, so wmi timed out occur.

To address this issue, reset the 11d state during device recovery so that
WMI_SCAN_CHAN_LIST_CMDID does not timed out for short interval time such
as 10 seconds.

Tested-on: WCN6855 hw2.0 PCI WLAN.HSP.1.1-03125-QCAHSPSWPL_V1_V2_SILICONZ_LITE-3

Fixes: 1f682dc9 ("ath11k: reduce the wait time of 11d scan and hw scan while add interface")
Signed-off-by: Wen Gong <quic_wgong@quicinc.com>
Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
Link: https://lore.kernel.org/r/20220505034636.29582-1-quic_wgong@quicinc.com

drivers/net/wireless/ath/ath11k/core.c

@@ -1620,6 +1620,7 @@ static void ath11k_core_pre_reconfigure_recovery(struct ath11k_base *ab)
 
 		ieee80211_stop_queues(ar->hw);
 		ath11k_mac_drain_tx(ar);
+		ar->state_11d = ATH11K_11D_IDLE;
 		complete(&ar->completed_11d_scan);
 		complete(&ar->scan.started);
 		complete(&ar->scan.completed);

drivers/net/wireless/ath/ath11k/mac.c

@@ -6155,6 +6155,11 @@ void ath11k_mac_11d_scan_stop(struct ath11k *ar)
 	ath11k_dbg(ar->ab, ATH11K_DBG_MAC, "mac stop 11d vdev id %d\n",
 		   ar->vdev_id_11d_scan);
 
+	if (ar->state_11d == ATH11K_11D_PREPARING) {
+		ar->state_11d = ATH11K_11D_IDLE;
+		complete(&ar->completed_11d_scan);
+	}
+
 	if (ar->vdev_id_11d_scan != ATH11K_11D_INVALID_VDEV_ID) {
 		vdev_id = ar->vdev_id_11d_scan;
 

drivers/net/wireless/ath/ath11k/reg.c

@@ -139,6 +139,9 @@ int ath11k_reg_update_chan_list(struct ath11k *ar, bool wait)
 			   "reg hw scan wait left time %d\n", left);
 	}
 
+	if (ar->state == ATH11K_STATE_RESTARTING)
+		return 0;
+
 	bands = hw->wiphy->bands;
 	for (band = 0; band < NUM_NL80211_BANDS; band++) {
 		if (!bands[band])