mac80211: be more careful in suspend/resume

When suspending with all netdevs down, the device
is stopped but we still call a number of driver
callbacks that the driver might not expect. The
same happens during resume, we might call a few
callbacks without starting the driver. Fix this
by checking open_count around more things and
exiting quickly if it is 0.

Also, while at this I noticed that the coverage
class isn't reprogrammed after resume, so add
that.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/net/mac80211/pm.c b/net/mac80211/pm.c
index f87e993e713b..6326d3439861 100644
--- a/net/mac80211/pm.c
+++ b/net/mac80211/pm.c
@@ -34,6 +34,9 @@ int __ieee80211_suspend(struct ieee80211_hw *hw, struct cfg80211_wowlan *wowlan)
         struct ieee80211_sub_if_data *sdata;
         struct sta_info *sta;
 
+        if (!local->open_count)
+                goto suspend;
+
         ieee80211_scan_cancel(local);
 
         if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {