mac80211: use a counter for remain-on-channel cookie

Instead of using the pointer which can be re-used
fairly quickly due to allocator patterns and then
makes debugging difficult, maintain a counter and
use its value. Since it's a 64-bit value it can't
really wrap, but catch that case anyway since it
most likely points to a bug somewhere.

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

1 files changed, 2 insertions, 1 deletions

diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index a1f7c139308e..d272e0cabc37 100644
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -356,7 +356,7 @@ struct ieee80211_roc_work {
 
         u32 duration, req_duration;
         struct sk_buff *frame;
-        u64 mgmt_tx_cookie;
+        u64 cookie, mgmt_tx_cookie;
 };
 
 /* flags used in struct ieee80211_if_managed.flags */
@@ -1142,6 +1142,7 @@ struct ieee80211_local {
         struct list_head roc_list;
         struct work_struct hw_roc_start, hw_roc_done;
         unsigned long hw_roc_start_time;
+        u64 roc_cookie_counter;
 
         struct idr ack_status_frames;
         spinlock_t ack_status_lock;