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mac80211: avoid looking up tid_tx/tid_rx from timers 

There's no need to re-lookup the data structures now that
we actually get them immediately with from_timer(), just
avoid that. The struct has to be valid anyway, otherwise
the timer object itself would no longer be valid, and we
can't have a different version of the struct since only a
single session per TID is permitted.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Johannes Berg 2017-10-18 13:44:23 +02:00
parent 02049ce27e
commit d559e303b1
2 changed files with 11 additions and 37 deletions
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17
net/mac80211/agg-rx.c
View File

@ -153,27 +153,16 @@ EXPORT_SYMBOL(ieee80211_stop_rx_ba_session);
*/
static void sta_rx_agg_session_timer_expired(struct timer_list *t)
{
struct tid_ampdu_rx *tid_rx_timer =
from_timer(tid_rx_timer, t, session_timer);
struct sta_info *sta = tid_rx_timer->sta;
u8 tid = tid_rx_timer->tid;
struct tid_ampdu_rx *tid_rx;
struct tid_ampdu_rx *tid_rx = from_timer(tid_rx, t, session_timer);
struct sta_info *sta = tid_rx->sta;
u8 tid = tid_rx->tid;
unsigned long timeout;
rcu_read_lock();
tid_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
if (!tid_rx) {
rcu_read_unlock();
return;
}
timeout = tid_rx->last_rx + TU_TO_JIFFIES(tid_rx->timeout);
if (time_is_after_jiffies(timeout)) {
mod_timer(&tid_rx->session_timer, timeout);
rcu_read_unlock();
return;
}
rcu_read_unlock();
ht_dbg(sta->sdata, "RX session timer expired on %pM tid %d\n",
sta->sta.addr, tid);

31
net/mac80211/agg-tx.c
View File

@ -429,18 +429,12 @@ int ___ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid,
*/
static void sta_addba_resp_timer_expired(struct timer_list *t)
{
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;
struct tid_ampdu_tx *tid_tx = from_timer(tid_tx, t, addba_resp_timer);
struct sta_info *sta = tid_tx->sta;
u8 tid = tid_tx->tid;
/* check if the TID waits for addBA response */
rcu_read_lock();
tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
if (!tid_tx ||
test_bit(HT_AGG_STATE_RESPONSE_RECEIVED, &tid_tx->state)) {
rcu_read_unlock();
if (test_bit(HT_AGG_STATE_RESPONSE_RECEIVED, &tid_tx->state)) {
ht_dbg(sta->sdata,
"timer expired on %pM tid %d not expecting addBA response\n",
sta->sta.addr, tid);
@ -451,7 +445,6 @@ static void sta_addba_resp_timer_expired(struct timer_list *t)
sta->sta.addr, tid);
ieee80211_stop_tx_ba_session(&sta->sta, tid);
rcu_read_unlock();
}
void ieee80211_tx_ba_session_handle_start(struct sta_info *sta, int tid)
@ -529,29 +522,21 @@ void ieee80211_tx_ba_session_handle_start(struct sta_info *sta, int tid)
*/
static void sta_tx_agg_session_timer_expired(struct timer_list *t)
{
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;
struct tid_ampdu_tx *tid_tx = from_timer(tid_tx, t, session_timer);
struct sta_info *sta = tid_tx->sta;
u8 tid = tid_tx->tid;
unsigned long timeout;
rcu_read_lock();
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();
if (test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) {
return;
}
timeout = tid_tx->last_tx + TU_TO_JIFFIES(tid_tx->timeout);
if (time_is_after_jiffies(timeout)) {
mod_timer(&tid_tx->session_timer, timeout);
rcu_read_unlock();
return;
}
rcu_read_unlock();
ht_dbg(sta->sdata, "tx session timer expired on %pM tid %d\n",
sta->sta.addr, tid);