[PATCH] wifi: ath12k: fix recovery fail while firmware crash when doing channel switch

[Jeff Johnson]

On 9/5/2023 3:52 AM, Wen Gong wrote:
> When firmware crashed while channel switch running, recovery starts in
> ath12k. Then ieee80211_sta_connection_lost() will be called by function
> ieee80211_restart_work() in mac80211. And then many WMI command timeout
> because firmware is crashed. Each WMI command cost 3 seconds, then the
> total time will be large and leads recovery fail.
> 
> Hence change to set value ATH12K_FLAG_CRASH_FLUSH early and then
> ath12k_wmi_cmd_send() will not wait 3 seconds, then recovery will be
> started quickly and success.
> 
> Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.0-03427-QCAHMTSWPL_V1.0_V2.0_SILICONZ-1.15378.4
> 
> Signed-off-by: Wen Gong <quic_wgong at quicinc.com>

Acked-by: Jeff Johnson <quic_jjohnson at quicinc.com>

> ---
>   drivers/net/wireless/ath/ath12k/core.c | 3 +++
>   1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/net/wireless/ath/ath12k/core.c b/drivers/net/wireless/ath/ath12k/core.c
> index 3df8059d5512..56be7298ac86 100644
> --- a/drivers/net/wireless/ath/ath12k/core.c
> +++ b/drivers/net/wireless/ath/ath12k/core.c
> @@ -685,6 +685,9 @@ static void ath12k_core_pre_reconfigure_recovery(struct ath12k_base *ab)
>   	ab->stats.fw_crash_counter++;
>   	spin_unlock_bh(&ab->base_lock);
>   
> +	if (ab->is_reset)
> +		set_bit(ATH12K_FLAG_CRASH_FLUSH, &ab->dev_flags);
> +
>   	for (i = 0; i < ab->num_radios; i++) {
>   		pdev = &ab->pdevs[i];
>   		ar = pdev->ar;
> 
> base-commit: 3f257461ab0ab19806bae2bfde4c3cd88dbf050e