mac80211: track assigned vifs in chanctx

This can be useful. Provides a more straghtforward
way to iterate over interfaces bound to a given
chanctx and allows tracking chanctx usage
explicitly.

The structure is protected by local->chanctx_mtx.

Signed-off-by: Michal Kazior <michal.kazior@tieto.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

diff --git a/net/mac80211/chan.c b/net/mac80211/chan.c
index 4ed229c..504526c 100644 (file)
--- a/net/mac80211/chan.c
+++ b/net/mac80211/chan.c
@@ -276,6 +276,7 @@ ieee80211_new_chanctx(struct ieee80211_local *local,
        if (!ctx)
                return ERR_PTR(-ENOMEM);
 
+       INIT_LIST_HEAD(&ctx->assigned_vifs);
        ctx->conf.def = *chandef;
        ctx->conf.rx_chains_static = 1;
        ctx->conf.rx_chains_dynamic = 1;
@@ -420,6 +421,7 @@ static int ieee80211_assign_vif_chanctx(struct ieee80211_sub_if_data *sdata,
                curr_ctx->refcount--;
                drv_unassign_vif_chanctx(local, sdata, curr_ctx);
                conf = NULL;
+               list_del(&sdata->assigned_chanctx_list);
        }
 
        if (new_ctx) {
@@ -429,6 +431,8 @@ static int ieee80211_assign_vif_chanctx(struct ieee80211_sub_if_data *sdata,
 
                new_ctx->refcount++;
                conf = &new_ctx->conf;
+               list_add(&sdata->assigned_chanctx_list,
+                        &new_ctx->assigned_vifs);
        }
 
 out:

diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index 4018ba1..3b3b45a 100644 (file)
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -691,6 +691,8 @@ struct ieee80211_chanctx {
        struct list_head list;
        struct rcu_head rcu_head;
 
+       struct list_head assigned_vifs;
+
        enum ieee80211_chanctx_mode mode;
        int refcount;
        bool driver_present;
@@ -756,6 +758,8 @@ struct ieee80211_sub_if_data {
        bool csa_radar_required;
        struct cfg80211_chan_def csa_chandef;
 
+       struct list_head assigned_chanctx_list; /* protected by chanctx_mtx */
+
        /* context reservation -- protected with chanctx_mtx */
        struct ieee80211_chanctx *reserved_chanctx;
        struct cfg80211_chan_def reserved_chandef;

diff --git a/net/mac80211/iface.c b/net/mac80211/iface.c
index 90b6063..a562d0f 100644 (file)
--- a/net/mac80211/iface.c
+++ b/net/mac80211/iface.c
@@ -1291,6 +1291,7 @@ static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
        INIT_WORK(&sdata->work, ieee80211_iface_work);
        INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
        INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
+       INIT_LIST_HEAD(&sdata->assigned_chanctx_list);
 
        switch (type) {
        case NL80211_IFTYPE_P2P_GO: