mac80211: set channel only once during auth/assoc

There's no need to set up the channel during auth
and again during assoc, just do it once. Currently
this doesn't result in any changes since calling
hw_config() with an unchanged channel will return
early, but with the channel context work this has
an impact on channel context assignment.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>

diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index e065ef5..6820552 100644 (file)
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -3038,41 +3038,17 @@ int ieee80211_max_network_latency(struct notifier_block *nb,
        return 0;
 }
 
-static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
-                                    struct cfg80211_bss *cbss, bool assoc)
+static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
+                                 struct cfg80211_bss *cbss)
 {
        struct ieee80211_local *local = sdata->local;
        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
-       struct ieee80211_bss *bss = (void *)cbss->priv;
-       struct sta_info *new_sta = NULL;
-       bool have_sta = false;
-       int err;
        int ht_cfreq;
        enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
        const u8 *ht_oper_ie;
        const struct ieee80211_ht_operation *ht_oper = NULL;
        struct ieee80211_supported_band *sband;
 
-       if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
-               return -EINVAL;
-
-       if (assoc) {
-               rcu_read_lock();
-               have_sta = sta_info_get(sdata, cbss->bssid);
-               rcu_read_unlock();
-       }
-
-       if (!have_sta) {
-               new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
-               if (!new_sta)
-                       return -ENOMEM;
-       }
-
-       mutex_lock(&local->mtx);
-       ieee80211_recalc_idle(sdata->local);
-       mutex_unlock(&local->mtx);
-
-       /* switch to the right channel */
        sband = local->hw.wiphy->bands[cbss->channel->band];
 
        ifmgd->flags &= ~IEEE80211_STA_DISABLE_40MHZ;
@@ -3135,10 +3111,51 @@ static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
        local->oper_channel = cbss->channel;
        ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
 
+       return 0;
+}
+
+static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
+                                    struct cfg80211_bss *cbss, bool assoc)
+{
+       struct ieee80211_local *local = sdata->local;
+       struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
+       struct ieee80211_bss *bss = (void *)cbss->priv;
+       struct sta_info *new_sta = NULL;
+       bool have_sta = false;
+       int err;
+
+       if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
+               return -EINVAL;
+
+       if (assoc) {
+               rcu_read_lock();
+               have_sta = sta_info_get(sdata, cbss->bssid);
+               rcu_read_unlock();
+       }
+
+       if (!have_sta) {
+               new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
+               if (!new_sta)
+                       return -ENOMEM;
+       }
+
+       mutex_lock(&local->mtx);
+       ieee80211_recalc_idle(sdata->local);
+       mutex_unlock(&local->mtx);
+
        if (new_sta) {
                u32 rates = 0, basic_rates = 0;
                bool have_higher_than_11mbit;
                int min_rate = INT_MAX, min_rate_index = -1;
+               struct ieee80211_supported_band *sband;
+
+               sband = local->hw.wiphy->bands[cbss->channel->band];
+
+               err = ieee80211_prep_channel(sdata, cbss);
+               if (err) {
+                       sta_info_free(local, new_sta);
+                       return err;
+               }
 
                ieee80211_get_rates(sband, bss->supp_rates,
                                    bss->supp_rates_len,