mac80211: aggregation: Convert timers to use timer_setup()
In preparation for unconditionally passing the struct timer_list pointer to
all timer callbacks, switch to using the new timer_setup() and from_timer()
to pass the timer pointer explicitly.
This removes the tid mapping array and expands the tid structures to
add a pointer back to the station, along with the tid index itself.
Cc: Johannes Berg <johannes@sipsolutions.net>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: linux-wireless@vger.kernel.org
Cc: netdev@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
[switch tid variables to u8, the valid range is 0-15 at most,
initialize tid_tx->sta/tid properly]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
diff --git a/net/mac80211/agg-tx.c b/net/mac80211/agg-tx.c
index bef516e..3680b38 100644
--- a/net/mac80211/agg-tx.c
+++ b/net/mac80211/agg-tx.c
@@ -422,15 +422,12 @@ int ___ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid,
* add Block Ack response will arrive from the recipient.
* If this timer expires sta_addba_resp_timer_expired will be executed.
*/
-static void sta_addba_resp_timer_expired(unsigned long data)
+static void sta_addba_resp_timer_expired(struct timer_list *t)
{
- /* not an elegant detour, but there is no choice as the timer passes
- * only one argument, and both sta_info and TID are needed, so init
- * flow in sta_info_create gives the TID as data, while the timer_to_id
- * array gives the sta through container_of */
- u16 tid = *(u8 *)data;
- struct sta_info *sta = container_of((void *)data,
- struct sta_info, timer_to_tid[tid]);
+ struct tid_ampdu_tx *tid_tx_timer =
+ from_timer(tid_tx_timer, t, addba_resp_timer);
+ struct sta_info *sta = tid_tx_timer->sta;
+ u8 tid = tid_tx_timer->tid;
struct tid_ampdu_tx *tid_tx;
/* check if the TID waits for addBA response */
@@ -525,21 +522,17 @@ void ieee80211_tx_ba_session_handle_start(struct sta_info *sta, int tid)
* After accepting the AddBA Response we activated a timer,
* resetting it after each frame that we send.
*/
-static void sta_tx_agg_session_timer_expired(unsigned long data)
+static void sta_tx_agg_session_timer_expired(struct timer_list *t)
{
- /* not an elegant detour, but there is no choice as the timer passes
- * only one argument, and various sta_info are needed here, so init
- * flow in sta_info_create gives the TID as data, while the timer_to_id
- * array gives the sta through container_of */
- u8 *ptid = (u8 *)data;
- u8 *timer_to_id = ptid - *ptid;
- struct sta_info *sta = container_of(timer_to_id, struct sta_info,
- timer_to_tid[0]);
+ struct tid_ampdu_tx *tid_tx_timer =
+ from_timer(tid_tx_timer, t, session_timer);
+ struct sta_info *sta = tid_tx_timer->sta;
+ u8 tid = tid_tx_timer->tid;
struct tid_ampdu_tx *tid_tx;
unsigned long timeout;
rcu_read_lock();
- tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[*ptid]);
+ tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
if (!tid_tx || test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) {
rcu_read_unlock();
return;
@@ -555,9 +548,9 @@ static void sta_tx_agg_session_timer_expired(unsigned long data)
rcu_read_unlock();
ht_dbg(sta->sdata, "tx session timer expired on %pM tid %d\n",
- sta->sta.addr, (u16)*ptid);
+ sta->sta.addr, tid);
- ieee80211_stop_tx_ba_session(&sta->sta, *ptid);
+ ieee80211_stop_tx_ba_session(&sta->sta, tid);
}
int ieee80211_start_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid,
@@ -670,16 +663,15 @@ int ieee80211_start_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid,
__set_bit(HT_AGG_STATE_WANT_START, &tid_tx->state);
tid_tx->timeout = timeout;
+ tid_tx->sta = sta;
+ tid_tx->tid = tid;
/* response timer */
- setup_timer(&tid_tx->addba_resp_timer,
- sta_addba_resp_timer_expired,
- (unsigned long)&sta->timer_to_tid[tid]);
+ timer_setup(&tid_tx->addba_resp_timer, sta_addba_resp_timer_expired, 0);
/* tx timer */
- setup_deferrable_timer(&tid_tx->session_timer,
- sta_tx_agg_session_timer_expired,
- (unsigned long)&sta->timer_to_tid[tid]);
+ timer_setup(&tid_tx->session_timer,
+ sta_tx_agg_session_timer_expired, TIMER_DEFERRABLE);
/* assign a dialog token */
sta->ampdu_mlme.dialog_token_allocator++;