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-rw-r--r--net/mac80211/scan.c19
1 files changed, 19 insertions, 0 deletions
diff --git a/net/mac80211/scan.c b/net/mac80211/scan.c
index 08afe74b98f4..d2d17a449224 100644
--- a/net/mac80211/scan.c
+++ b/net/mac80211/scan.c
@@ -238,6 +238,9 @@ static bool ieee80211_prep_hw_scan(struct ieee80211_local *local)
enum ieee80211_band band;
int i, ielen, n_chans;
+ if (test_bit(SCAN_HW_CANCELLED, &local->scanning))
+ return false;
+
do {
if (local->hw_scan_band == IEEE80211_NUM_BANDS)
return false;
@@ -940,7 +943,23 @@ void ieee80211_scan_cancel(struct ieee80211_local *local)
if (!local->scan_req)
goto out;
+ /*
+ * We have a scan running and the driver already reported completion,
+ * but the worker hasn't run yet or is stuck on the mutex - mark it as
+ * cancelled.
+ */
+ if (test_bit(SCAN_HW_SCANNING, &local->scanning) &&
+ test_bit(SCAN_COMPLETED, &local->scanning)) {
+ set_bit(SCAN_HW_CANCELLED, &local->scanning);
+ goto out;
+ }
+
if (test_bit(SCAN_HW_SCANNING, &local->scanning)) {
+ /*
+ * Make sure that __ieee80211_scan_completed doesn't trigger a
+ * scan on another band.
+ */
+ set_bit(SCAN_HW_CANCELLED, &local->scanning);
if (local->ops->cancel_hw_scan)
drv_cancel_hw_scan(local,
rcu_dereference_protected(local->scan_sdata,
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