mac80211: update mesh beacon on workqueue

Instead of updating the mesh beacon immediately when requested (which would require the sdata_lock()), defer it to the mac80211 workqueue.

Fixes yet another deadlock on calling sta_info_flush() with the sdata_lock() held from ieee80211_stop_mesh(). We could just drop the sdata_lock() around the mesh_sta_cleanup() call, but this path is also taken from several non-locked error paths.

---
v3:

cast u32 as unsigned long endianess (Johannes) clear mesh work flags on stop (Johannes) test_and_clear_bit() returns a bool {set,clear}_bit() takes the bit _number_

 net/mac80211/ieee80211_i.h |    1 +
 net/mac80211/mesh.c        |   53 ++++++++++++++++++++++++++++++++++----------
 net/mac80211/mesh.h        |    2 ++
 3 files changed, 44 insertions(+), 12 deletions(-)

index 7a6f1a0..f79156d 100644
@@ -543,6 +543,7 @@ struct ieee80211_if_mesh {
 	struct timer_list mesh_path_root_timer;
 
 	unsigned long wrkq_flags;
+	unsigned long mbss_changed;
 
 	u8 mesh_id[IEEE80211_MAX_MESH_ID_LEN];
 	size_t mesh_id_len;

index 01a28bc..53bd870 100644
@@ -57,6 +57,7 @@ enum mesh_path_flags {
  * grow
  * @MESH_WORK_ROOT: the mesh root station needs to send a frame
  * @MESH_WORK_DRIFT_ADJUST: time to compensate for clock drift relative to other
+ * @MESH_WORK_MBSS_CHANGED: rebuild beacon and notify driver of BSS changes
  * mesh nodes
  */
 enum mesh_deferred_task_flags {

@@ -65,6 +66,7 @@ enum mesh_deferred_task_flags {
 	MESH_WORK_GROW_MPP_TABLE,
 	MESH_WORK_ROOT,
 	MESH_WORK_DRIFT_ADJUST,
+	MESH_WORK_MBSS_CHANGED,
 };
 
 /**

1.7.10.4

That seems to have gone wrong :)

I fixed it and applied this.

johannes