Commit cb04b5ef authored by Johannes Berg's avatar Johannes Berg
Browse files

wifi: mac80211: don't clear DTIM period after setting it 



Fix the code that sets the DTIM period to always propagate it
into link->conf->dtim_period and not overwrite it, while still
preferring to set it from the beacon data if available.

Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
parent e406121e

net/mac80211/mlme.c

+12 −13
Original line number Diff line number Diff line
@@ -2717,18 +2717,10 @@ static u32 ieee80211_link_set_associated(struct ieee80211_link_data *link, 
	}



	if (link->u.mgd.have_beacon) {

		/*

		 * If the AP is buggy we may get here with no DTIM period

		 * known, so assume it's 1 which is the only safe assumption

		 * in that case, although if the TIM IE is broken powersave

		 * probably just won't work at all.

		 */

		bss_conf->dtim_period = link->u.mgd.dtim_period ?: 1;

		bss_conf->beacon_rate = bss->beacon_rate;

		changed |= BSS_CHANGED_BEACON_INFO;

	} else {

		bss_conf->beacon_rate = NULL;

		bss_conf->dtim_period = 0;

	}



	/* Tell the driver to monitor connection quality (if supported) */
@@ -4934,10 +4926,11 @@ static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata, 
	}



	for (link_id = 0; link_id < IEEE80211_MLD_MAX_NUM_LINKS; link_id++) {

		struct cfg80211_bss *cbss = assoc_data->link[link_id].bss;

		struct ieee80211_link_data *link;

		struct link_sta_info *link_sta;



		if (!assoc_data->link[link_id].bss)

		if (!cbss)

			continue;



		link = sdata_dereference(sdata->link[link_id], sdata);
@@ -4957,19 +4950,25 @@ static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata, 
		if (WARN_ON(!link_sta))

			goto out_err;



		if (link_id != assoc_data->assoc_link_id) {

			struct cfg80211_bss *cbss = assoc_data->link[link_id].bss;

		if (!link->u.mgd.have_beacon) {

			const struct cfg80211_bss_ies *ies;



			rcu_read_lock();

			ies = rcu_dereference(cbss->beacon_ies);

			if (ies)

				link->u.mgd.have_beacon = true;

			else

				ies = rcu_dereference(cbss->ies);

			ieee80211_get_dtim(ies,

					   &link->conf->sync_dtim_count,

					   &link->u.mgd.dtim_period);

			link->conf->dtim_period = link->u.mgd.dtim_period ?: 1;

			link->conf->beacon_int = cbss->beacon_interval;

			rcu_read_unlock();

		}



		link->conf->dtim_period = link->u.mgd.dtim_period ?: 1;



		if (link_id != assoc_data->assoc_link_id) {

			err = ieee80211_prep_channel(sdata, link, cbss,

						     &link->u.mgd.conn_flags);

			if (err) {