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Subject[PATCH] wcn36xx: Implement cancel_hw_scan
Date
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@gentoo.org>
Fixes: 886039036c20 ("wcn36xx: Implement firmware assisted scan")
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
---
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 */
--
2.11.0
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