Wen Gong <[email protected]> wrote:
> Scan failure can not be recovered from when running a loop of the
> following steps:
> 1. run scan: "iw wlan scan".
> 2. run command: echo assert > /sys/kernel/debug/ath12k/wcn7850\ hw2.0/simulate_fw_crash
> immediately after step 1.
>
> result:
> scan failed and can not recover even when wlan recovery succeeds:
> command failed: Device or resource busy (-16)
>
> reason:
> When scan arrives, WMI_START_SCAN_CMDID is sent to the firmware and
> function ath12k_mac_op_hw_scan() returns, then simulate_fw_crash arrives
> and the scan started event does not arrive, and then it starts to do
> recovery of wlan. __ath12k_mac_scan_finish() which is called from
> ath12k_core_halt() is one step of recovery, it will not call
> ieee80211_scan_completed() by logic currently because the scan state is
> ATH12K_SCAN_STARTING. Thus it leads the scan not being completed in
> mac80211, and leads all consecutive scans failing with -EBUSY in
> nl80211_trigger_scan even after wlan recovery success.
>
> Indicate scan complete with aborted flag to mac80211 for
> ATH12K_SCAN_STARTING to allow recovery from scan failed with "Device or
> resource busy (-16)" after wlan recovery.
>
> 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 <[email protected]>
> Acked-by: Jeff Johnson <[email protected]>
> Signed-off-by: Kalle Valo <[email protected]>
Patch applied to ath-next branch of ath.git, thanks.
c2ebb1d11ab9 wifi: ath12k: indicate to mac80211 scan complete with aborted flag for ATH12K_SCAN_STARTING state
--
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