mac80211: stop Rx during HW reconfig

While HW reconfig is in progress, drop all incoming Rx. This prevents
incoming packets from changing the internal state of the driver or
calling callbacks of the low level driver while it is in inconsistent
state.

Signed-off-by: Arik Nemtsov <arik@wizery.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/net/mac80211/main.c b/net/mac80211/main.c
index d81c178c7712..976e41365c25 100644
--- a/net/mac80211/main.c
+++ b/net/mac80211/main.c
@@ -345,6 +345,13 @@ void ieee80211_restart_hw(struct ieee80211_hw *hw)
         ieee80211_stop_queues_by_reason(hw,
                 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
 
+        /*
+         * Stop all Rx during the reconfig. We don't want state changes
+         * or driver callbacks while this is in progress.
+         */
+        local->in_reconfig = true;
+        barrier();
+
         schedule_work(&local->restart_work);
 }
 EXPORT_SYMBOL(ieee80211_restart_hw);