wifi: mac80211: consistently use sdata_dereference()

Instead of open-coding it, use sdata_dereference().
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

net/mac80211/ibss.c

@@ -255,8 +255,7 @@ static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
 		drv_leave_ibss(local, sdata);
 	}
 
-	presp = rcu_dereference_protected(ifibss->presp,
-					  lockdep_is_held(&sdata->wdev.mtx));
+	presp = sdata_dereference(ifibss->presp, sdata);
 	RCU_INIT_POINTER(ifibss->presp, NULL);
 	if (presp)
 		kfree_rcu(presp, rcu_head);
@@ -509,8 +508,7 @@ int ieee80211_ibss_csa_beacon(struct ieee80211_sub_if_data *sdata,
 	rcu_read_unlock();
 	cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
 
-	old_presp = rcu_dereference_protected(ifibss->presp,
-					  lockdep_is_held(&sdata->wdev.mtx));
+	old_presp = sdata_dereference(ifibss->presp, sdata);
 
 	presp = ieee80211_ibss_build_presp(sdata,
 					   sdata->vif.bss_conf.beacon_int,
@@ -714,8 +712,7 @@ static void ieee80211_ibss_disconnect(struct ieee80211_sub_if_data *sdata)
 	sdata->vif.cfg.ssid_len = 0;
 
 	/* remove beacon */
-	presp = rcu_dereference_protected(ifibss->presp,
-					  lockdep_is_held(&sdata->wdev.mtx));
+	presp = sdata_dereference(ifibss->presp, sdata);
 	RCU_INIT_POINTER(sdata->u.ibss.presp, NULL);
 	if (presp)
 		kfree_rcu(presp, rcu_head);
@@ -1530,8 +1527,7 @@ static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
 
 	sdata_assert_lock(sdata);
 
-	presp = rcu_dereference_protected(ifibss->presp,
-					  lockdep_is_held(&sdata->wdev.mtx));
+	presp = sdata_dereference(ifibss->presp, sdata);
 
 	if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
 	    len < 24 + 2 || !presp)

net/mac80211/mesh.c

@@ -993,8 +993,7 @@ ieee80211_mesh_rebuild_beacon(struct ieee80211_sub_if_data *sdata)
 	struct beacon_data *old_bcn;
 	int ret;
 
-	old_bcn = rcu_dereference_protected(sdata->u.mesh.beacon,
-					    lockdep_is_held(&sdata->wdev.mtx));
+	old_bcn = sdata_dereference(sdata->u.mesh.beacon, sdata);
 	ret = ieee80211_mesh_build_beacon(&sdata->u.mesh);
 	if (ret)
 		/* just reuse old beacon */
@@ -1084,8 +1083,7 @@ void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata)
 	ieee80211_link_info_change_notify(sdata, 0, BSS_CHANGED_BEACON_ENABLED);
 
 	/* remove beacon */
-	bcn = rcu_dereference_protected(ifmsh->beacon,
-					lockdep_is_held(&sdata->wdev.mtx));
+	bcn = sdata_dereference(ifmsh->beacon, sdata);
 	RCU_INIT_POINTER(ifmsh->beacon, NULL);
 	kfree_rcu(bcn, rcu_head);
 
@@ -1380,8 +1378,7 @@ int ieee80211_mesh_finish_csa(struct ieee80211_sub_if_data *sdata)
 	ifmsh->chsw_ttl = 0;
 
 	/* Remove the CSA and MCSP elements from the beacon */
-	tmp_csa_settings = rcu_dereference_protected(ifmsh->csa,
-					    lockdep_is_held(&sdata->wdev.mtx));
+	tmp_csa_settings = sdata_dereference(ifmsh->csa, sdata);
 	RCU_INIT_POINTER(ifmsh->csa, NULL);
 	if (tmp_csa_settings)
 		kfree_rcu(tmp_csa_settings, rcu_head);