> In the even that the wcn36xx interface is brought down while a
> hw_scan
> is active we must abort and wait for the ongoing scan to signal
> completion to mac80211.
>
> Reported-by: Mart Raudsepp <leio@xxxxxxxxxx>
> Fixes: 886039036c20 ("wcn36xx: Implement firmware assisted scan")
> Signed-off-by: Bjorn Andersson <bjorn.andersson@xxxxxxxxxx>
Tested-by: Mart Raudsepp <leio@xxxxxxxxxx>
Please s/even/event/ in commit log
> ---
> drivers/net/wireless/ath/wcn36xx/main.c | 25
> ++++++++++++++++++++++++-
> drivers/net/wireless/ath/wcn36xx/wcn36xx.h | 1 +
> 2 files changed, 25 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/net/wireless/ath/wcn36xx/main.c
> b/drivers/net/wireless/ath/wcn36xx/main.c
> index a24edf33be93..bb7110f7fc86 100644
> --- a/drivers/net/wireless/ath/wcn36xx/main.c
> +++ b/drivers/net/wireless/ath/wcn36xx/main.c
> @@ -574,6 +574,7 @@ static void wcn36xx_hw_scan_worker(struct
> work_struct *work)
> struct cfg80211_scan_request *req = wcn->scan_req;
> u8 channels[WCN36XX_HAL_PNO_MAX_NETW_CHANNELS_EX];
> struct cfg80211_scan_info scan_info = {};
> + bool aborted = false;
> int i;
>
> wcn36xx_dbg(WCN36XX_DBG_MAC, "mac80211 scan %d channels
> worker\n", req->n_channels);
> @@ -585,6 +586,13 @@ static void wcn36xx_hw_scan_worker(struct
> work_struct *work)
>
> wcn36xx_smd_init_scan(wcn, HAL_SYS_MODE_SCAN);
> for (i = 0; i < req->n_channels; i++) {
> + mutex_lock(&wcn->scan_lock);
> + aborted = wcn->scan_aborted;
> + mutex_unlock(&wcn->scan_lock);
> +
> + if (aborted)
> + break;
> +
> wcn->scan_freq = req->channels[i]->center_freq;
> wcn->scan_band = req->channels[i]->band;
>
> @@ -596,7 +604,7 @@ static void wcn36xx_hw_scan_worker(struct
> work_struct *work)
> }
> wcn36xx_smd_finish_scan(wcn, HAL_SYS_MODE_SCAN);
>
> - scan_info.aborted = false;
> + scan_info.aborted = aborted;
> ieee80211_scan_completed(wcn->hw, &scan_info);
>
> mutex_lock(&wcn->scan_lock);
> @@ -615,6 +623,8 @@ static int wcn36xx_hw_scan(struct ieee80211_hw
> *hw,
> mutex_unlock(&wcn->scan_lock);
> return -EBUSY;
> }
> +
> + wcn->scan_aborted = false;
> wcn->scan_req = &hw_req->req;
> mutex_unlock(&wcn->scan_lock);
>
> @@ -623,6 +633,18 @@ static int wcn36xx_hw_scan(struct ieee80211_hw
> *hw,
> return 0;
> }
>
> +static void wcn36xx_cancel_hw_scan(struct ieee80211_hw *hw,
> + struct ieee80211_vif *vif)
> +{
> + struct wcn36xx *wcn = hw->priv;
> +
> + mutex_lock(&wcn->scan_lock);
> + wcn->scan_aborted = true;
> + mutex_unlock(&wcn->scan_lock);
> +
> + cancel_work_sync(&wcn->scan_work);
> +}
> +
> static void wcn36xx_update_allowed_rates(struct ieee80211_sta *sta,
> enum nl80211_band band)
> {
> @@ -1034,6 +1056,7 @@ static const struct ieee80211_ops wcn36xx_ops =
> {
> .tx = wcn36xx_tx,
> .set_key = wcn36xx_set_key,
> .hw_scan = wcn36xx_hw_scan,
> + .cancel_hw_scan = wcn36xx_cancel_hw_scan,
> .bss_info_changed = wcn36xx_bss_info_changed,
> .set_rts_threshold = wcn36xx_set_rts_threshold,
> .sta_add = wcn36xx_sta_add,
> diff --git a/drivers/net/wireless/ath/wcn36xx/wcn36xx.h
> b/drivers/net/wireless/ath/wcn36xx/wcn36xx.h
> index 571e9f76da7e..b52b4da9a967 100644
> --- a/drivers/net/wireless/ath/wcn36xx/wcn36xx.h
> +++ b/drivers/net/wireless/ath/wcn36xx/wcn36xx.h
> @@ -220,6 +220,7 @@ struct wcn36xx {
> int scan_freq;
> int scan_band;
> struct mutex scan_lock;
> + bool scan_aborted;
>
> /* DXE channels */
> struct wcn36xx_dxe_ch dxe_tx_l_ch; /* TX low
> */
