mac80211: cancel scan in ieee80211_restart_hw if software scan pending

This function exists to clean-up after a hardware error or something
similar.  The restart is accomplished using the same infrastructure used
to resume after a suspend.  The suspend path cancels running scans, so
it seems appropriate to do that here as well for software-based scans.
If a hardware-based scan is pending, issue a warning message since this
indicates that the drivers has failed to clean-up after itself.

Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 7 insertions, 1 deletions

diff --git a/net/mac80211/main.c b/net/mac80211/main.c
index 93194f61adb0..a06b6ee63c07 100644
--- a/net/mac80211/main.c
+++ b/net/mac80211/main.c
@@ -305,7 +305,13 @@ void ieee80211_restart_hw(struct ieee80211_hw *hw)
 
         trace_api_restart_hw(local);
 
-        /* use this reason, __ieee80211_resume will unblock it */
+        WARN(test_bit(SCAN_HW_SCANNING, &local->scanning),
+                "%s called with hardware scan in progress\n", __func__);
+
+        if (unlikely(test_bit(SCAN_SW_SCANNING, &local->scanning)))
+                ieee80211_scan_cancel(local);
+
+        /* use this reason, ieee80211_reconfig will unblock it */
         ieee80211_stop_queues_by_reason(hw,
                 IEEE80211_QUEUE_STOP_REASON_SUSPEND);