mac80211: release sched_scan_sdata when stopping sched scan

Assuming sched_scan_stop operation is synchronous the driver may not
necessary call ieee80211_sched_scan_stopped_work. Since this work is
the only place where sched_scan_sdata is released we can possibly run
into situation when it is never released. Fix this by releasing it
just after calling drv_sched_scan_stop.

Signed-off-by: Alexander Bondar <alexander.bondar@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

1 files changed, 4 insertions, 2 deletions

diff --git a/net/mac80211/scan.c b/net/mac80211/scan.c
index 836f500dfbf3..3ce7f2c8539a 100644
--- a/net/mac80211/scan.c
+++ b/net/mac80211/scan.c
@@ -1055,9 +1055,11 @@ int ieee80211_request_sched_scan_stop(struct ieee80211_sub_if_data *sdata)
         /* We don't want to restart sched scan anymore. */
         local->sched_scan_req = NULL;
 
-        if (rcu_access_pointer(local->sched_scan_sdata))
+        if (rcu_access_pointer(local->sched_scan_sdata)) {
                 ret = drv_sched_scan_stop(local, sdata);
-
+                if (!ret)
+                        rcu_assign_pointer(local->sched_scan_sdata, NULL);
+        }
 out:
         mutex_unlock(&local->mtx);