Wen Gong <quic_wgong@xxxxxxxxxxx> wrote:
> 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: 1f682dc9fb37 ("ath11k: reduce the wait time of 11d scan and hw scan while add interface")
> 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.
9497b7880ffd ath11k: reset 11d state in process of recovery
--
https://patchwork.kernel.org/project/linux-wireless/patch/20220505034636.29582-1-quic_wgong@xxxxxxxxxxx/
https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches
