wifi: mac80211: sdata can be NULL during AMPDU start

[platform/kernel/linux-rpi.git] / net / mac80211 / agg-tx.c

diff --git a/net/mac80211/agg-tx.c b/net/mac80211/agg-tx.c
index 1deb3d8..a4d3fa1 100644 (file)
--- a/net/mac80211/agg-tx.c
+++ b/net/mac80211/agg-tx.c
@@ -491,7 +491,7 @@ void ieee80211_tx_ba_session_handle_start(struct sta_info *sta, int tid)
 {
        struct tid_ampdu_tx *tid_tx;
        struct ieee80211_local *local = sta->local;
-       struct ieee80211_sub_if_data *sdata = sta->sdata;
+       struct ieee80211_sub_if_data *sdata;
        struct ieee80211_ampdu_params params = {
                .sta = &sta->sta,
                .action = IEEE80211_AMPDU_TX_START,
@@ -521,6 +521,7 @@ void ieee80211_tx_ba_session_handle_start(struct sta_info *sta, int tid)
         */
        synchronize_net();
 
+       sdata = sta->sdata;
        params.ssn = sta->tid_seq[tid] >> 4;
        ret = drv_ampdu_action(local, sdata, &params);
        tid_tx->ssn = params.ssn;
@@ -534,6 +535,9 @@ void ieee80211_tx_ba_session_handle_start(struct sta_info *sta, int tid)
                 */
                set_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state);
        } else if (ret) {
+               if (!sdata)
+                       return;
+
                ht_dbg(sdata,
                       "BA request denied - HW unavailable for %pM tid %d\n",
                       sta->sta.addr, tid);