cfg80211: vastly simplify locking

Virtually all code paths in cfg80211 already (need to) hold
the RTNL. As such, there's little point in having another
four mutexes for various parts of the code, they just cause
lock ordering issues (and much of the time, the RTNL and a
few of the others need thus be held.)

Simplify all this by getting rid of the extra four mutexes
and just use the RTNL throughout. Only a few code changes
were needed to do this and we can get rid of a work struct
for bonus points.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>

1 files changed, 2 insertions, 3 deletions

diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 58f6302da145..5430f70c63b3 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -1257,6 +1257,7 @@ struct cfg80211_ssid {
  * @scan_start: time (in jiffies) when the scan started
  * @wdev: the wireless device to scan for
  * @aborted: (internal) scan request was notified as aborted
+ * @notified: (internal) scan request was notified as done or aborted
  * @no_cck: used to send probe requests at non CCK rate in 2GHz band
  */
 struct cfg80211_scan_request {
@@ -1274,7 +1275,7 @@ struct cfg80211_scan_request {
         /* internal */
         struct wiphy *wiphy;
         unsigned long scan_start;
-        bool aborted;
+        bool aborted, notified;
         bool no_cck;
 
         /* keep last */
@@ -2874,8 +2875,6 @@ struct wireless_dev {
 
         struct mutex mtx;
 
-        struct work_struct cleanup_work;
-
         bool use_4addr, p2p_started;
 
         u8 address[ETH_ALEN] __aligned(sizeof(u16));