mac80211: add status_driver_data array to ieee80211_tx_info

Drivers might want to have private data in addition
to all other ieee80211_tx_info.status fields.

The current ieee80211_tx_info.rate_driver_data overlaps
with some of the non-rate data (e.g. ampdu_ack_len), so
it might not be good enough.

Since we already know how much free bytes remained,
simply use this size to define (void *) array.

While on it, change ack_signal type from int to the more
explicit s32 type.

Signed-off-by: Eliad Peller <eliadx.peller@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index 86faa41..f6988fe 100644 (file)
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -697,11 +697,11 @@ struct ieee80211_tx_info {
                } control;
                struct {
                        struct ieee80211_tx_rate rates[IEEE80211_TX_MAX_RATES];
-                       int ack_signal;
+                       s32 ack_signal;
                        u8 ampdu_ack_len;
                        u8 ampdu_len;
                        u8 antenna;
-                       /* 21 bytes free */
+                       void *status_driver_data[21 / sizeof(void *)];
                } status;
                struct {
                        struct ieee80211_tx_rate driver_rates[